https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53848 Wed 28 Feb 2024 16:26:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42992 Wed 28 Feb 2024 15:21:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40951 Wed 20 Jul 2022 15:22:13 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52614 La-Euchar >goethite >HDPB-Z >HDPC-M. Birnessite exhibited great affinity for As and drastically reduced As extractability by more than 90% in all single extractions. The results revealed that HDPC-M, HDPB-Z, La-Euchar, birnessite, and goethite are promising immobilizing agents for in situ stabilization of As in terrestrial environments.]]> Wed 18 Oct 2023 13:47:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54800 Wed 13 Mar 2024 11:41:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29405 Wed 11 Apr 2018 12:16:54 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24098 in vitro data for barite contaminated soils using the physiologically based extraction test (PBET) methodology. The existence of barite in plant tissue and the possibility of 'biomineralised' zones was also investigated using Scanning Electron Microscopy. Soils with low barium (Ba) concentrations showed a higher proportion of Ba extractability than barite rich samples. Barium uptake to spinach from soil was different between short term spiking studies and field weathered soils. Furthermore, Ba crystals were not evident in spinach tissue or acid digest solutions grown in barium nitrate spiked soils despite high accumulation. Barite was found in the plant digest solutions from barite contaminated soils only. Results indicate that under the conservative assumptions made, a child would need to consume extreme quantities of soil over an extended period to cause chronic health problems.]]> Wed 10 Nov 2021 15:05:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41661 Wed 10 Aug 2022 11:03:24 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30603 Wed 09 Mar 2022 15:58:43 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46503 Wed 07 Feb 2024 16:39:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29507 Wed 06 Apr 2022 13:59:57 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44001 Wed 05 Oct 2022 14:57:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43982 Wed 05 Oct 2022 14:29:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34954 Wed 04 Dec 2019 10:03:09 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38372 Wed 01 Sep 2021 12:12:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26146 Tue 31 Jul 2018 16:35:15 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46674 Tue 29 Nov 2022 09:21:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54541 Tue 27 Feb 2024 20:41:02 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54504 Tue 27 Feb 2024 15:32:02 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54439 Tue 27 Feb 2024 14:00:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35640 Tue 24 Sep 2019 16:19:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35638 L-tryptophan and possessed ammonium ion production potential in the order PSB3 > PSB1 > PSB2 (P < 0.05). The sterilized seeds of mung beans (Vigna radiata) displayed greater germination rate and higher growth under bacterium-enriched conditions. The effect on seed germination traits by the isolated strains followed the order of PSB3 > PSB1 > PSB2 (P < 0.05). Our results suggest that the three isolated PSB strains from earthworm gut possess intrinsic abilities of growth promotion, metal resistance and solubilization of phosphate which could be exploited for plant growth promotion and bioremediation even under metal-stress conditions.]]> Tue 24 Sep 2019 15:37:54 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37099 Tue 18 Aug 2020 09:55:43 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52545 Tue 17 Oct 2023 14:51:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24636 80%). Acinetobacter venetianus immobilized on MBC demonstrated superior efficiency in degrading diesel oil (94%) compared to planktonic cells culture (82%) over a 3-day period. Moreover, the simultaneous adsorption and biodegradation of diesel oil using these immobilized cells fitted well to the pseudo second order (R² > 0.99). Scanning electron microscopy (SEM) revealed that through absorption, cells attached well to the cavum of MBC stalk cells. Fourier transform infrared analysis (FTIR) revealed that a large number of bands at 1300-1500 cm^-1 existed, demonstrating that the diesel oil was degraded and new bands were formed. Gas Chromatography Mass Spectrum (GC-MS) analysis indicated the immobilized cells could degrade diesel oil into esters and aldehydes. Results justified the applicability of MBC as the carrier matrix for immobilizing microorganisms in removing diesel oil compounds from industrial wastewater.]]> Tue 14 Nov 2023 13:37:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43106 Tue 13 Sep 2022 12:54:31 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46989 Tue 13 Dec 2022 09:35:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44336 Tue 11 Oct 2022 19:21:36 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32679 Tue 10 Jul 2018 15:38:12 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39814 90% degradation of MO occurred by 120 ± 5.21, 75 ± 3.15 and 90 ± 3.61 min, respectively. Composites showed excellent catalytic reusability and environmental nontoxicity. Therefore, as effective and safe catalysts, they can shed light on exploring further usage in the environment and industrial set-ups.]]> Tue 09 Aug 2022 15:38:16 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43892 Tue 04 Oct 2022 13:59:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33762 Tue 01 Oct 2019 11:37:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33758 3 showed higher correlations (r = 0.91 and 0.96, respectively) with plant K uptake values. Both the chemical and biological methods were able to extract only a portion (12–20%) of total K present in the mineral powder. The results indicated that the mineral powder could be used as a slow release K fertilizer in soils. Further studies in long term applications with exhaustive crops under field conditions are needed to assess its feasibility as a source of K in agriculture.]]> Thu 30 Jan 2020 11:19:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39734 Thu 28 Jul 2022 08:55:29 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45385 Thu 27 Oct 2022 16:12:22 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47297 Thu 27 Jul 2023 11:25:51 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24067 Thu 27 Jan 2022 15:58:21 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46516 95%) than mulch nos. 1 and 3, which could be attributed to the retention of numerous PAHs in its interlayers, preventing its movement into the underlying soil, environment and atmosphere.]]> Thu 24 Nov 2022 16:04:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48966 Thu 20 Apr 2023 10:29:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48440 Thu 16 Mar 2023 14:38:59 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44451 Thu 13 Oct 2022 15:01:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35120 in situ treatment and remediation approaches are limited for low-permeability aquifers materials, particularly because of limitations to the delivery of reactive chemicals or access to contaminated plumes. In this paper, we describe the development of a cutting-edge solution for the remediation of contaminated groundwater in a low-permeability and low water-bearing aquifer contaminated with the chlorinated hydrocarbon trichloroethylene (TCE). The remediation technique introduced coupling of large-diameter permeable reactive barrier wells (PRB wells) with: (1) extraction wells through in a highly impacted plume; and (2) re-injection wells at the fringe of the plume. A pump-and-treat system (PTS) was employed at the site in a separate plume to reduce the mass of TCE near the second source zone. This research focuses only on the large diameter PRB well system. Conceptual site model development, design considerations, implementation and performance evaluation demonstrated how each of these elements were applied in the field. Approaches for coupling technologies to increase technical and economic feasibility are presented. Extraction and reinjection wells of treated groundwater at the fringe of the plume promoted a positive hydraulic gradient, facilitated groundwater transport through the reactive media, and contained the plume. Detailed geospatial and statistical analysis with over 10 years' monitoring data showed that dissolved TCE plume delineation shrank, and still concentration continues to decline, and were projected to meet the demands of remediation compliance regulations in the next few years. The results of this study indicate that significant remediation was achieved despite the challenging hydraulic conditions of the aquifer. The developed the remediation technology and conclusions indicate the system's usefulness at other sites.]]> Thu 11 May 2023 11:46:01 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48155 Thu 09 Mar 2023 09:37:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54648 Thu 07 Mar 2024 15:27:21 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31436 6 mD and hydraulic conductivity of 1.5 cm/s. To further enhance the adsorption performance, the granules were later modified by surfactant hexadecyltrimethylammonium bromide (HDTMA) and tested for its adsorption capacity for removing toxic antifouling agent tributyltin (TBT) at high flow rate. It was found that cationic HDTMA modification enhanced the TBT adsorption capacity by 20%. This new granulation method allows the mass production of porous organo clay granules while the porous granular clay is also a good substrate for coating material such as nano sized zero-valent iron to further extent its application.]]> Sat 24 Mar 2018 08:43:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30131 Sat 24 Mar 2018 07:39:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30449 Sat 24 Mar 2018 07:38:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26339 Sat 24 Mar 2018 07:35:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26360 in vitro data streams and computational toxicology are the crucial factors in the NexGen risk assessment, as well as uncertainties minimisation. Although in this review we cannot yet predict how the exposure science and modern toxicology will develop in the long-term, current techniques from emerging science can be integrated to improve decision-making.]]> Sat 24 Mar 2018 07:35:52 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29720 t), the time required for the TCE vapor to pass through the soil column, and specific volume of retention (V_R), and total volume of TCE retained in soil. Results show TCE vapor retardation is mainly due to the rapid partitioning of the compound to SOM. However, the specific volume of retention of clayey soils with secondary mineral particles was higher. Linear regression analyses of the SOM and clay fraction with V_R show that a unit increase in clay fraction results in higher sorption of TCE (V_R) than the SOM. However, partitioning of TCE vapor was not consistent with the samples' surface areas but was mainly a function of the type of secondary minerals present in soils.]]> Sat 24 Mar 2018 07:33:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30320 rat = 0.26RB_swine + 17.3, R2 = 0.70, p < 0.001), despite the regression slope coefficient revealing that the rat model would underestimate RB by about one quarter compared to using swine. Conclusions: In the comparison employed in this study, an interspecies difference of four in RB using AUC assay was identified between the rat and swine models regarding pharmacokinetic differences, which supported the body weight scaling method recommended by US EPA. Future research should focus on the carcinogenic competency (pharmacodynamics) used in experiment animals and humans.]]> Sat 24 Mar 2018 07:31:49 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30893 14C-labelled phenanthrene and a model bacterium Burkholderia sartisoli, we studied the mineralization of phenanthrene on the surface of a moderately heat-treated (up to 400 °C) palygorskite. The heat treatment at 400 °C induced a reduction of binding sites (e.g., by the elimination of organic matter and/or channel shrinkage) in the palygorskite and thus imparted a weaker sequestration of phenanthrene on its surface and within the pores. As a result, a supplement with the thermally modified palygorskite (400 °C) significantly increased (20–30%; p < 0.05) the biomineralization of total phenanthrene in a simulated soil slurry system. These results are highly promising to develop a clay mineral based technology for the bioremediation of PAH contaminants in water and soil environments.]]> Sat 24 Mar 2018 07:30:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30898 Scaevola albida, Chrysocephalum semipapposum, and Enteropogon acicularis. Some Australian native plants inhibited nitrification in their rhizosphere. We propose future studies on these selected plant species by identifying and characterising the nitrification inhibiting compounds and also the potential of nitrification inhibition in reducing nitrogen losses through nitrate leaching and nitrous oxide emission.]]> Sat 24 Mar 2018 07:30:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30892 Sat 24 Mar 2018 07:30:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30891 14C-tracing study showed that the mild acid/alkali-treated clay products increased the PAH biodegradation (5–8%) in the order of 0.5 M HCl ≥ unmodified > 3 M NaOH ≥ 0.5 M NaOH for smectite, and 0.5 M HCl > 0.5 M NaOH ≥ unmodified ≥ 3 M NaOH for palygorskite. The biodegradation was correlated (r = 0.81) with the bioavailable fraction of PAHs and microbial growth as affected particularly by the 0.5 M HCl and 0.5 M NaOH-treated clay minerals. These results could be pivotal in developing a clay-modulated bioremediation technology for cleaning up PAH-contaminated soils and sediments in the field.]]> Sat 24 Mar 2018 07:30:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:28313 Sat 24 Mar 2018 07:27:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26717 Burkholderia sartisoli. The mineralogical and physico-chemical properties were characterised in detail, and the bacterial adhesion to the substrate and their growth were observed in relation to these properties. The major variation in the cation exchange capacity (CEC), surface area, water content and the elemental dissolution in the aqueous medium occurred in the palygorskite products heated at extreme temperature (700-900 °C). These changes significantly influenced the bacterial growth and attachment. The maximum viability was imparted by the palygorskite product obtained at 400 °C. Dissolution of Al from products heated above 500 °C also posed inhibitory effect on bacterial growth in the aqueous media. This study provided valuable information about the mechanisms of bacterial viability as affected by modified clay minerals, which is important for developing a novel clay-modulated-bioremediation technology.]]> Sat 24 Mar 2018 07:26:22 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26578 Sat 24 Mar 2018 07:26:12 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30526 Sat 24 Mar 2018 07:25:05 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26318 V than As^III to L. disperma but was highly effective in reducing both the As^III and As^V toxicity to C. cf. dubia. The growth of Chlorella sp. was significantly higher (p<0.05) in remediated and pre-remediated water than in controls (non-As-contaminated filtered Colo River water) for As^III, while the opposite was observed for As^V, indicating that As^V is more toxic than As^III to this microalga. Although the IOCS can efficiently remove As from contaminated water, residual As and other constituents (e.g. Fe, nitrate) in the remediated water had a significant effect on freshwater organisms.]]> Sat 24 Mar 2018 07:24:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25140 Sat 24 Mar 2018 07:17:12 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24816 in vivo measurement is reliable but resource insensitive, in vitro approaches promise to provide high-throughput RBA predictions. One challenge on using in vitro bioaccessibility (BAc) to predict in vivo RBA is how to minimize the heterogeneities associated with in vivo-in vitro correlations (IVIVCs) stemming from various biomarkers (kidney, blood, liver, urinary and femur), in vitro approaches and studies. In this study, 252 paired RBA-BAc data were retrieved from 9 publications, and then a Bayesian hierarchical model was implemented to address these random effects. A generic linear model (RBA (%) = (0.87 ± 0.16) × BAc + (4.70 ± 2.47)) of the IVIVCs was identified. While the differences of the IVIVCs among the in vitro approaches were significant, the differences among biomarkers were relatively small. The established IVIVCs were then applied to predict Pb RBA of which an overall Pb RBA estimation was 0.49 ± 0.25. In particular the RBA in the residential land was the highest (0.58 ± 0.19), followed by house dust (0.46 ± 0.20) and mining/smelting soils (0.45 ± 0.31). This is a new attempt to: firstly, use a meta-analysis to correlate Pb RBA and BAc; and secondly, estimate Pb RBA in relation to soil types.]]> Sat 24 Mar 2018 07:15:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24550 Sat 24 Mar 2018 07:11:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24705 Escherichia coli DH5α cells. Based on the results, all three genes were actively expressed and their products could act on their corresponding substrates.]]> Sat 24 Mar 2018 07:10:56 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24695 Sat 24 Mar 2018 07:10:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24068 Azospirillum sp. based on phylogenetic analysis of 16S rRNA. The strain oxidized 100 µM As(III) to As(V) in both culture media (minimal salts) and real groundwater within 8 and 10 h, respectively. The oxidation of As(III) by this strain was observed within the pH range 5-10 with the best performance at pH 7-8. As(III) oxidation was found to be independent of cell growth which implies the oxidation enzymes are constitutively expressed. The whole cell kinetic study highlighted a lower value of kinetic constant, K_s as 32.9 µM As(III), which indicates that the strain MM-17 has greater affinity for As(III). The gene sequence of the large subunit of arsenite oxidase of MM-17 showed 99 and 72% similarity to the large subunit of arsenite oxidase of Stenotrophomonas sp. MM-7 and Sinorhizobium sp. M14, respectively. Sphaeroplasts experiments suggest that arsenite oxidase is a membrane associated protein in MM-17.]]> Sat 24 Mar 2018 07:09:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24051 Chlorella sp., were investigated using different phosphate levels. The results indicated that arsenate was highly toxic than arsenite to the alga, and the phosphate limitation in growth media greatly enhanced arsenate toxicity. The uptake of arsenate in algal cells was more than that of arsenite, and the predominant species in the growth media was arsenate after 8 days of exposure to arsenite or arsenate, indicating arsenite oxidation by this microalga. Arsenate reduction was also observed when the alga was incubated in a phosphate-limiting growth medium. Similar to the process of biotransformation, the alga accumulated more arsenic when it was exposed to arsenate and preferably more in a phosphate-limiting condition. Although phosphate significantly influences the biotransformation and bioaccumulation of arsenic, the oxidizing ability and higher accumulation capacity of this alga have great potential for its application in arsenic bioremediation.]]> Sat 24 Mar 2018 07:09:36 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50618 Mon 31 Jul 2023 14:35:54 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52823 Mon 30 Oct 2023 09:11:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38311 8H₄K₂O₁₂Sb₂, Sb₂S₃, Sb₂O₃ and Sb₂O₃ nanoparticles) were evaluated during 120 days ageing time. A black soil (BS) with approximately 12% organic matter (OM) and a red soil (RS) with less than 1% OM were amended with 1000 mg Sb kg⁻¹ of different Sb compounds and subjected to single extractions with distilled (DI) water, 2M HNO₃, Simplified Bioaccessibility Extraction Test (SBET) and a modified Community Bureau of Reference (BCR) sequential extraction method. The results revealed that there are substantial variations in dissolution rate of various Sb sources, depending upon soil type and Sb compound. The amounts of DI water extractability of Sb during the incubation time varied between <1% and 2%, whereas HNO₃ extractable fractions and Sb bioaccessibility at the end of ageing time ranged between about 1%-3% and <1%–9% of the total Sb, with maximum bioaccessibility observed in BS contaminated with C₈H₄K₂O₁₂Sb₂. The residual and labile fractions accounted for 77–93% and 0.1–4% of the total Sb, respectively, indicating that Sb is mostly associated with recalcitrant fractions of the soils. The results of single and sequential extraction studies revealed that source of Sb, ageing time and soil properties can greatly affect the bioavailability of Sb in soils. The findings of this research provide a deeper understanding of the potential risks associated with Sb compounds and highlights the role of site-specific considerations for improving the robustness of toxicity guidelines and long-term management of Sb contaminated sites.]]> Mon 29 Jan 2024 18:01:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38651 Mon 29 Jan 2024 17:49:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36981 Mon 27 Jul 2020 10:07:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43453 Cucumis sativus L. (cucumber). The study showed that increasing ageing time of As from 0.25 to 5 years increased the EC₁₀ and EC₅₀ values by 4.0 and 1.76 fold, respectively. The dependence of ageing on soil properties was also examined, although only Freundlich sorption parameters were correlated to the ageing factor (r = 0.68, P = 0.028). Soils with high adsorption capacity also showed the greatest change in toxicity over 5 years. In addition, data was compiled from relevant literature to develop a model for As ecotoxicity. The combined model (n = 54) showed no relationship with pH but was correlated to the oxalate extractable iron content and %clay. Arsenate ecotoxicity (EC₅₀, mg/kg) in the multivariate model was related to oxalate iron content, %clay and ageing time. Thus, the results of this study have significant implications for risk assessment of long-term As contaminated soils.]]> Mon 19 Sep 2022 15:12:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43435 P_app), with differences in ML retention and complexation amongst the chelants and the gut microbes. The decrease in ML permeability varied amongst the MLs. Chelating agents reduce intestinal absorption of MLs by forming complexes thereby making them less permeable. In the case of gut bacteria, the decrease in the intestinal permeability of MLs may be associated to a direct protection of the intestinal barrier against the MLs or indirect intestinal ML sequestration by the gut bacteria through adsorption on bacterial surface. Thus, both gut microbes and chelating agents can be used to decrease the intestinal permeability of MLs, thereby mitigating their toxicity.]]> Mon 19 Sep 2022 11:35:28 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51765 Cd > Pb > As(III)>As(V) for E. coli; and Hg > Cd > As(III)>Pb > As(V) for the two Lactobacillus sp. Arsenite (AsIII) showed higher toxicity than arsenate (AsV) to gut bacteria. While As is an anion, Cd, Pb and Hg are cations and hence their binding capacity to the bacterial cell wall varied based on the charge dependent functional groups. However, the toxic effects of PTEs for a bacteria are controlled by their speciation and bioavailability.]]> Mon 18 Sep 2023 14:23:29 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52526 Mon 16 Oct 2023 10:46:17 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47957 Mon 13 Feb 2023 14:21:00 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39548 Mon 08 Aug 2022 11:27:19 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:55065 Mon 08 Apr 2024 13:13:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38772 Fri 28 Jan 2022 13:59:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39222 +-M) and hexadecylpyridinium bromide modified zeolite (HDPy⁺-Z) were used to measure Sb(III) uptake from solutions containing 0.5–2.5 mM antimonite. Adsorption isotherms of antimonite were studied using the Langmuir and Freundlich equations. Adsorption kinetics were investigated using pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models. The results of X-ray diffraction showed a large interlayer expansion for HDPy⁺-M, whereas the X-ray patterns of HDPy⁺-Z remained unchanged. Uptake of Sb(III) by both HDPy⁺-M and HDPy⁺-Z could be fitted well to the Langmuir isotherm, while the kinetics of adsorption could be described well using the pseudo-second-order model. Maximum adsorption capacities for Sb(III) uptake by HDPy⁺-M and HDPy⁺-Z were calculated to be 108.7 and 61.34 mg g⁻¹, respectively. The results of the kinetic studies revealed that Sb(III) adsorption to HDPy⁺-Z was found to be quite fast and the reaction reached equilibrium in 8 h, whereas for HDPy⁺-M equilibration was attained within 24 h. The adsorption of antimonite onto both HDPy⁺-M and HDPy⁺-Z was found to be selective in the presence of Cl⁻¹ and SO4⁻² competitive anions. Considering the high affinity for Sb(III) uptake from solutions containing high concentrations of antimonite, both HDPy⁺-M and HDPy⁺-Z could be used as promising adsorbents for environmental applications.]]> Fri 27 May 2022 11:44:31 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39212 Lactobacillus acidophilus, Lactobacillus rhamnosus and Escherichia coli. Lead toxicity to these three microbes was also examined at various pH values. Bioaccessibility of Pb was measured using gastric and intestinal extractions. Both Pb spiked and Pb-contaminated shooting range field soils were used to measure Pb bioaccessibility in the presence and absence of gut microbes. The results indicated that Pb toxicity to gut microbes, as measured by LD₅₀ value, decreased with increasing pH, and was higher for Lactobacillus species. Gut microbes decreased the bioaccessible Pb; the effect was more pronounced at low pH, mimicking gastric conditions than in conditions closer to the intestine. Lead adsorption by these microbes increased at the higher pH tested, and E. coli adsorbed higher amounts of Pb than did the Lactobacillus species. The effect of gut microbes on reducing Pb bioaccessibility may be attributed to microbially-induced immobilization of Pb through adsorption, precipitation, and complexation reactions. The study demonstrates that bioaccessibility and subsequently bioavailability of metal(loid)s can be modulated by gut microbes, and it is important to undertake bioaccessibility measurements in the presence of gut microbes.]]> Fri 27 May 2022 11:09:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38320 −1) and dissolved organic matter(0–20 mg L⁻¹). The string rate of more than 100 rpm indicated the DGT will not likely be affected by flow rate in the aquatic environment. The study successfully indicates the DGT’s performance on diuron, providing a promising technique for future investigation of distribution and occurrence in the natural environment.]]> Fri 27 Aug 2021 12:02:40 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51953 90%). These findings reflected the role of deep learning analysis in understanding the behavior of CFX for the degradation process.]]> Fri 22 Sep 2023 17:03:57 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40441 S-Zn > S-Pb and C-Zn > T-Cd > C-Pb. PET particles exposed to Zn, Cd, and Pb solution adsorbed from 7.2 to 8.5%, 5.3 to 9.8%, and 29.8 to 68.5% of the initial heavy metals concentration, respectively. 11.3 to 15.2%, 12.5 to 23.35%, and 5.5 to 33.6% of the initially adsorbed Zn, Cd, and Pb were desorbed in the wheat rhizosphere zone in the three defined scenarios, respectively. The results show that PET particles can act as a vector in transferring heavy metals to the rhizosphere zone.]]> Fri 22 Jul 2022 14:31:16 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44718 90% degradation over one week treatment. Surface capping of the synthesized material (GMP-nZVI) could enhance activation. The capping through controlled release of ferrous ion compared to C-nZVI might prevent scavenging of sulfate radicals. The inhibition of TPH degradation by mannitol demonstrated the role of hydroxyl radical in degrading TPH under GMP-nZVI activated persulfate oxidation system. In view of its TPH removal efficiency, low production cost and low environmental concerns, the GMP-nZVI has greater advantages over the chemically synthesized nanoparticles.]]> Fri 21 Oct 2022 09:32:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35133 Fri 21 Jun 2019 13:21:04 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52664 Fri 20 Oct 2023 09:09:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24007 Fri 20 Apr 2018 11:13:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36535 Fri 16 Feb 2024 15:39:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40593 Fri 15 Jul 2022 11:07:13 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54660 Fri 08 Mar 2024 10:56:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53573 Fri 08 Dec 2023 15:39:21 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39009 Fri 08 Apr 2022 15:53:39 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:55055 Fri 05 Apr 2024 13:53:30 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45570 2 nano particles (NPs) were synthesized by precipitation using high purity of TiCl₄ and the surface was modified by hydrothermal treatment. The NPs were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDX), Transmission electron microscopy (TEM), Thermo-Gravimetric Analysis (TGA), X-ray Photoelectron Spectroscopy (XPS) and Brunauer–Emmet–Teller (BET) surface area techniques. The synthesized NPs were utilized for removal of methylene blue (MB) dye from wastewater. The effect of various experimental parameters such as pH, adsorbent dosage, concentration of dye, photocatalyst concentration on the degradation efficiency of the effluent has been studied. The equilibrium studies for adsorption were done using Langmuir and Freundlich isotherms and better agreement was attained with the Langmuir model. The maximum adsorption capacity () was calculated as 88.1057 mg/g using Langmuir equation. The kinetic parameters displayed that MB adsorption onto the NPs followed pseudo-second-order kinetics model. In this paper, removal efficiencies of three different techniques photocatalysis, adsorption and electrolysis treatments were compared for methylene blue abatement using surface modified Nps. The results indicated that, photocatalytic and adsorption methods showed 1 and 60.70 percent of removal of dye at chosen higher initial dye concentrations of 25 mg/L and 50 mg/L respectively, whereas electrolysis methods showed 94.95 percent removal of dye even at higher initial concentration of dye (50 mg/L). Electrolysis method seems to be more superior, possibly because of continuous flow of electric current through conductive electrode surface which generates the negative charges and these charges are capable of degrading the dye into constituent products more effectively than the other two methods. Mechanisms for removal/degradation dye from wastewater using NPs for all the above three methods has been predicted.]]> Fri 04 Nov 2022 14:46:03 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52954 Fri 03 Nov 2023 11:04:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39332 Fri 03 Jun 2022 16:59:24 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39301 Fri 03 Jun 2022 13:29:25 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47883 Fri 03 Feb 2023 16:00:04 AEDT ]]>