https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46637 Wed 28 Feb 2024 14:49:30 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49315 Wed 28 Feb 2024 14:48:43 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39615 90% removal of perfluorooctanesulfonate (PFOS) and perfluorooctanoic acid (PFOA) from biosolids derived biochar could be achieved in the pyrolysis-combustion integrated process. The biosolids derived biochar demonstrated >80% adsorption of long-chain PFASs and 19-27% adsorption of short-chain PFASs from PFAS contaminated water.]]> Wed 10 Aug 2022 11:48:20 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44026 Wed 05 Oct 2022 15:18:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46333 Daphnia carinata) using a battery of comprehensive toxicity tests, including a 48 h acute and a 21-day chronic assays. The survival, growth, and reproduction of D. carinata were monitored over a 21-day life cycle. PFOS exhibited higher toxicity than PFOA. The 48 h LC₅₀ values (confidence interval) based on acute toxicity for PFOA and PFOS were 78.2 (54.9–105) mg L⁻¹ and 8.8 (6.4–11.6) mg L⁻¹, respectively. Chronic exposure to PFOS for 21 days displayed mortality and reproductive defects in D. carinata at a concentration as low as 0.001 mg L⁻¹. Genotoxicity assessment using comet assay revealed that exposure for 96 h to PFOS at 1 and 10.0 mg L⁻¹ significantly damaged the organism's genetic makeup. The results of this study have great implications for risk assessment of PFOS and PFOA in aquatic ecosystems, given the potential of PFOS to pose a risk to Daphnia even at lower concentrations (1 μg L⁻¹).]]> Tue 15 Nov 2022 12:49:03 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38079 Tue 03 Aug 2021 15:12:30 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31956 −1 biosolids. Soil samples were analyzed for SOC fractions, including total organic carbon (TOC), labile, and non-labile carbon contents. The natural abundances of soil δ¹³C and δ¹⁵N were measured as isotopic tracers to fingerprint carbon derived from biosolids. An automated soil respirometer was used to measure in-situ diurnal CO₂ fluxes, soil moisture, and temperature. Application of biosolids increased the surface (0–15 cm) soil TOC by > 45% at both sites, which was attributed to the direct contribution from residual carbon in the biosolids and also from the increased biomass production. At both sites application of biosolids increased the non-labile carbon fraction that is stable against microbial decomposition, which indicated the soil carbon sequestration potential of biosolids. Soils amended with biosolids showed depleted δ¹³C, and enriched δ¹⁵N indicating the accumulation of biosolids residual carbon in soils. The in-situ respirometer data demonstrated enhanced CO₂ fluxes at the sites treated with biosolids, indicating limited carbon sequestration potential. However, addition of biosolids on both the clay loam and sandy loam soils found to be effective in building SOC than reducing it. Soil temperature and CO₂ fluxes, indicating that temperature was more important for microbial degradation of carbon in biosolids than soil moisture.]]> Thu 21 Oct 2021 12:52:20 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54105 Mon 05 Feb 2024 09:57:42 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52662 Fri 20 Oct 2023 09:09:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47455 Fri 20 Jan 2023 17:38:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50286 Fri 14 Jul 2023 09:21:20 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44045 Allium cepa root meristem cells. The A. cepa root tips were exposed to 6 different concentrations (1–100 mg L⁻¹) of PFOS for 48 h. Reduction in mitotic index and chromosomal aberrations was measured as genotoxic endpoints in meristematic root cells. Exposure to PFOS significantly affected cell division by reducing the miotic index at higher concentrations (>10 mg L⁻¹). The median effect concentration of PFOS to elicit cytotoxicity based on the mitotic index was 43.2 mg L⁻¹. Exposure to PFOS significantly increased chromosomal aberrations at concentrations >25 mg L⁻¹. The common aberrations were micronuclei, vagrant cells, and multipolar anaphase. The alkaline comet assay revealed a genotoxic potential of PFOS with increased tail DNA percentage at concentrations >25 mg L⁻¹. To our knowledge, this is the first study to report the cyto-genotoxic potential of PFOS in higher plants.]]> Fri 07 Oct 2022 14:28:51 AEDT ]]>