https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 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:41151 Wed 28 Feb 2024 14:56:22 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49120 Wed 28 Feb 2024 14:46:04 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51825 Wed 20 Sep 2023 10:07:10 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38847 −, SO₄²⁻, NO₃⁻, SiO₃²⁻ and PO₄³⁻. The adsorption affinity increased from 0.0047 to 0.0915 and 0.0053 to 0.4091 for As(V) and Sb(V), respectively. X-ray photoelectron spectroscopic investigation demonstrated a reductive conversion of As(V) to As(III) during the adsorption process with sulfide-modified α-FeOOH, but with no obvious variation of Sb(V) speciation. While the removal mechanism for As(V) was reduction followed by adsorption via hydroxyl groups, mainly surface complexation was involved in the removal of Sb(V). This study presented a simple strategy to enhance the adsorption capacity and adsorption affinity of α-FeOOH toward As(V)/Sb(V) via sulfide-modification.]]> Wed 16 Feb 2022 10:55:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46025 Metapenaeus macleayi). These fisheries have experienced declining productivity over the last ten years and increasing occurrence of catchment-derived stressors in estuaries contribute to this problem. We evaluated the effect of pH 4–7.5 on School Prawn survival at two salinities (27 and 14.5), pH 5, 6 and 7.5 on the predation escape response (PER) speed at two salinities (27 and 14.5), and pH 4 and 7.5 on respiration rates. While mortality appeared to be greater in the high salinity treatment, there was no significant relationship between proportional survival and pH for either salinity treatment. Respiration was significantly slower under acidic conditions and the average PER was almost twice as fast at pH 7.5 compared to pH 5 (p < 0.05), indicating prawns may fall prey to predation more easily in acidic conditions. These findings confirm the hypothesised impacts of acidic water on penaeid prawns. Given that the conditions simulated in these experiments reflect those encountered in estuaries, acidic runoff may be contributing to bottlenecks for estuarine species and impacting fisheries productivity.]]> Wed 09 Nov 2022 15:45:04 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47158 Wed 07 Feb 2024 18:00:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46020 Wed 07 Feb 2024 14:59:09 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46743 Wed 07 Feb 2024 14:57:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41352 Wed 07 Feb 2024 14:52:18 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51254 Tue 29 Aug 2023 10:47:01 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53297 Tue 21 Nov 2023 12:03:36 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35113 Tue 20 Feb 2024 11:41:20 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47034 Tue 13 Dec 2022 14:08:24 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51641 Tue 12 Sep 2023 20:15:54 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44255 p < 0.05) between the two particle size fractions of < 2 mm and < 250 μm; (2) EC, CEC and total Pb were significantly correlated to Pb bioaccessibility (p < 0.05); and (3) soil analyses based on source of Pb demonstrated a strongly significant relationship between Pb bioaccessibility and soil properties (CEC, EC, clay content and total Pb) for mining soils from Broken Hill (r² = 0.86, p < 0.05, n = 18). These results demonstrated the influences of Pb contamination sources, soil properties and particle size fractions on Pb bioaccessibility as well as the prediction of Pb bioaccessibility using soil properties. The findings documented here will help in developing a predictive tool for human health risk assessment and the remediation of Pb contaminated soils.]]> Tue 11 Oct 2022 12:44:05 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40048 Thu 21 Jul 2022 10:30:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49467 2+ flux from pak choi roots and demonstrated that hemin treatment decreased Cd uptake rather than its translocation within plants. Moreover, through comparing the responses of different chemical treatments in pak choi seedlings and Arabidopsis wild-type and heme oxygenase-1 (HO-1) mutant, we provided evidence that hemin-decreased Cd uptake was HO-1 dependent. Furthermore, analyses of hemin degradation products suggested that the hemin-derived suppression of Cd uptake suppression was probably relying on its degradation by-products, ferrous iron (Fe²⁺) and carbon monoxide (CO), via repressing the expression of a Fe²⁺/Cd²⁺ transporter BcIRT1 in pak choi roots.]]> Thu 18 May 2023 14:34:06 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43360 Thu 15 Sep 2022 15:47:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54279 LDPE > PP > PA. Further analysis indicated that the electrocoagulation treatment affected microplastic polymers physically, viz. flaking and changed surface conditions, as well as chemically, viz. changes in vibrational energies of C–O–C stretching bonds, C=O stretching bonds, C–H stretching bonds and formation of reactive oxygen species (ROS). Our findings indicate that whilst seemingly effective, electrocoagulation treatment induces changes to microplastic polymers that could beneficially lead to degradation, and/or further fragmentation or breakdown and thereby potentially generating more bioavailable toxic nanoplastic byproducts.]]> Thu 15 Feb 2024 14:47:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40072 500 kilotons of PBDEs still exist globally. Both ‘environmental persistence’ and ‘bioaccumulation tendencies’ are the hallmarks of PBDE toxicities; however, both these issues concerning household emissions of PBDEs have been least addressed theoretically or practically. Critical physiological functions, lipophilicity and toxicity, trophic transfer and tissue specificities are of utmost importance in the benefit/risk assessments of PBDEs. Since indoor debromination of deca-BDE often yields many products, a better understanding on their sorption propensity, environmental fate and human toxicities is critical in taking rigorous measures on the ever-growing global deca-BDE market. The data available in the literature on human toxicities of PBDEs have been validated following meta-analysis. In this direction, the intent of the present review was to provide a critical evaluation of the key aspects like compositional patterns/isomer ratios of PBDEs implicated in bioaccumulation, indoor PBDE emissions versus human exposure, secured technologies to deal with the toxic emissions, and human toxicity of PBDEs in relation to the number of bromine atoms. Finally, an emphasis has been made on the knowledge gaps and future research directions related to endurable flame retardants which could fit well into the benefit/risk strategy.]]> Thu 14 Jul 2022 13:53:13 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35935 9882 groundwater samples) were used to describe As variability in groundwater of Pakistan and for comparison with global data. The mean groundwater As content reported in these studies was 120 µg/L (range: 0.1-2090 µg/L; SD: ±307). About 73% of the values for mean As contents in the 43 studies were higher than the World Health Organization (WHO) permissible limit (10 µg/L) for drinking water, while 41% were higher than the permissible limit of As in Pakistan (50 µg/L). It was observed that groundwater samples in some areas of Punjab and Sindh provinces contained high As concentrations which were almost equal to concentrations reported in the most contaminated areas of the world. We predicted that the mean values of ADD, HQ and CR were 4.4 µg kg^-1day^-1(range: 0-77 µg kg^-1day^-1), 14.7 (range: 0-256) and 0.0029 (range: 0-0.0512), respectively, based on mean As concentrations reported in Pakistan. In addition, this article proposes some integrated sustainable solutions and future perspectives keeping in view the regional and global context, as well as the on-ground reality of the population drinking As-contaminated water, planning issues, awareness among civil society and role of the government bodies. Based on available data, it is predicted that almost 47 million people in Pakistan are residing in areas where more than 50% of groundwater wells contain As concentrations above the WHO recommended limit of As in drinking water.]]> Thu 14 Apr 2022 10:59:13 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30372 Thu 03 Feb 2022 12:19:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1672 Sat 24 Mar 2018 08:30:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1673 Sat 24 Mar 2018 08:30:24 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1171 Sat 24 Mar 2018 08:28:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30122 Sat 24 Mar 2018 07:37:58 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: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:54976 Mon 25 Mar 2024 15:21:19 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52720 Mon 23 Oct 2023 16:25:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46969 Mon 12 Dec 2022 16:12:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51560 Mon 11 Sep 2023 09:28:20 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54741 Mon 11 Mar 2024 14:25:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50761 Mon 07 Aug 2023 14:08:10 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42848 Mon 05 Sep 2022 15:12:20 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43556 Fri 23 Sep 2022 10:33:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54958 Fri 22 Mar 2024 15:28:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52681 Fri 20 Oct 2023 09:30:49 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39712 Fri 17 Jun 2022 17:10:04 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47357 Fri 13 Jan 2023 13:26:36 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47339 Fri 13 Jan 2023 12:16:30 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47292 Fri 13 Jan 2023 10:38:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46155 Fri 11 Nov 2022 19:06:14 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50207 Fri 07 Jul 2023 10:45:24 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34757 Fri 05 May 2023 15:48:50 AEST ]]>