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SSRN 2022年

作者： Xu, Xiangjian Wan, Shuoyang Xia, Fu Han, Xu Deng, Sheng Xiao, Han Jiang, Yonghai Liu, Hui Yang, Yu State Key Laboratory of Environmental Criteria and Risk Assessment and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China

Persulfate (S 2 O 8 2- ) is a strong oxidant that is widely used for treating organic contamination of groundwater. This study aims to develop persulfate gel sustaining-release material (PGSR) and gelatin-gel sustaining-release material (G-PGSR) that can be injected into aquifers via wells and slowly release S 2 O 8 2- to groundwater. In this study, compatibility and miscibility of colloidal silica gels and gelatin with S 2 O 8 2- were tested. Morphologies of the as-prepared PGSR and G-PGSR were observed by scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FT-IR). Release characteristics of PGSR containing variable persulfate concentrations (from 1.25 wt% to 5 wt%), silica sol (from 30 wt% to 40 wt%), and gelatin (from 0.5 wt% to 2.0 wt%) were monitored. The PGSR and G-PGSR exhibited a two-phase process in viscosity: a progressive phase characterized by gradually increase in viscosity followed by a gradually decrease phase. The maximum release rates achieved at 5 h in G-PGSR were similar to that in PGSR. The release persulfate concentrations in G-PGSR suggested that gelatin and colloidal silica were both compatible and miscible with S 2 O 8 2- . Meanwhile, the PGSR exhibits a characteristic two-phase increase in viscosity with increased silica sol concentrations, persulfate concentrations, and gelatin concentrations. The PGSR and G-PGSR both could create persistent oxidation degradation of 2,4-dinitrotoluene (2,4-DNT). These results suggested that colloidal silica and gelatin could be used to create PGSR and G-PGSR for persistent oxidation in groundwater remediation. © 2022, The Authors. All rights reserved.

关键词： Aquifers

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Synergistic Removal of Total Petroleum Hydrocarbons and Antibiotic Resistance Genes in Yellow River Delta Wetlands Contaminated Soil Composting Regulated by Biogas Slurry Addition

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SSRN 2024年

作者： He, Liangzi Wang, Yan Xi, Beidou Zhao, Xinyu Cai, Danmei Sun, Yiwen Du, Yuewei Zhang, Chuanyan State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control Chinese Research Academy of Environmental Sciences Beijing100012 China College of Life Science Northeast Agricultural University Harbin150030 China School of Environmental Science and Engineering Guilin University of Technology Guilin541000 China

The interactive effects between the emerging contaminant antibiotic resistance genes (ARGs) and the traditional pollutant total petroleum hydrocarbons (TPH) in contaminated soils remain unclear. The synergistic removal of TPH and ARGs from composted contaminated soil, along with the microbial mechanisms driven by the addition of biogas slurry, have not yet been investigated. This study explored the impact of biogas slurry on the synergistic degradation mechanisms and bacterial community dynamics of ARGs and TPH in compost derived from contaminated soil. The addition of biogas slurry resulted in a reduction of targeted ARGs and mobile genetic elements (MGEs) by 9.96%-95.70% and 13.32%-97.66%, respectively. Biogas slurry changed the succession of bacterial communities during composting, thereby reducing the transmission risk of ARGs. Pseudomonas, Cellvibrio, and Devosia were identified as core microorganisms in the synergistic degradation of ARGs and TPH. According to the partial least squares path model, temperature and NO3- indirectly influenced the removal of ARGs and TPH by directly regulating the abundance and composition of host microbes and MGEs. In summary, the results of this study contribute to the high-value utilization of biogas slurry and provide methodological support for the low-cost remediation of contaminated soils. © 2024, The Authors. All rights reserved.

关键词： Contamination

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Exposure to organophosphates, pyrethroids, neonicotinoids, and pentachlorophenol: Spatial variations in urinary biomarkers and associations with oxidative stress based on a repeated-measure study

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Science of the Total Environment 2025年 969卷 178934页

作者： Li, Ruijia Wan, Yanjian He, Zhen Wang, Danlu Xu, Shunqing Zhao, Xiuge Xia, Wei Key Laboratory of Environment and Health Ministry of Education Ministry of Environmental Protection State Key Laboratory of Environmental Health School of Public Health Tongji Medical College Huazhong University of Science and Technology Hubei Wuhan430030 China Center for Public Health Laboratory Service Institute of Environmental Health Wuhan Centers for Disease Prevention & Control Hubei Wuhan430024 China School of Environmental Science and Engineering Hainan University Hainan Haikou570228 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China

It is important to identify priority regions regarding contaminant exposure, especially for environmental epidemiological studies. Whereas very few studies explored spatial variations in concentrations of multiple insecticide metabolites in the general population, as well as their relationship with oxidative stress biomarkers (OSBs). We determined related target analytes in urine samples (n = 850) from 425 healthy adults in six cities of China during both autumn and winter. Eight organophosphorus metabolites (mOPPs), three pyrethroid metabolites (mPYRs), nine neonicotinoid insecticide metabolites (mNNIs), and pentachlorophenol (PCP) were detected in the urine samples. Additionally, linear mixed-effects model and weighted quantile sum model were used to assess the individual and combined effects of the insecticide exposure on selected OSBs. Altogether, 17 out of the 21 analytes were widely detected (73.1–100%). The median specific gravity (SG)-adjusted concentrations for the mOPPs, mPYRs, mNNIs, and PCP were 1.17–4.85, 0.45–0.79, 0.09–1.07, and 0.38 ng/mL, respectively. The mOPPs in Lanzhou (northwest China), mPYRs and mNNIs in Dalian (northeast China), and PCP in Chengdu (southwest China) had the highest concentrations among the six cities. The concentrations of the mNNIs and PCP in urban areas were significantly higher than those in rural areas, while the concentrations of some mOPPs and mPYRs were higher in rural areas. The concentrations of most analytes were higher in autumn than in winter. Hazard quotient of >1 for chlorpyrifos was observed in 9.2% of the study participants, suggested a potential health risk, while the estimated daily intake values of the other analytes were lower than their chronic reference doses. Many of the insecticide exposure biomarkers were significantly associated with increased OSBs;among them, each interquartile range-fold increase in the insecticide exposure biomarkers was associated with 5.4–19.0%, 4.6–19.4%, and 12.4–83.3% increase

关键词： Oxidative stress

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Long-Term Cyanide Degradation Characteristics and the Effects of Long-Term Cyanide Residue Landfills on the Environment and Human Health: Evidence from Nine Landfill Sites in North China

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SSRN 2022年

作者： Ya, Xu Li, Weishi Qifei, Huang Yuqiang, Liu Jingcai, Liu Li, Li Dahai, Yan State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control Beijing100012 China

Cyanide residues weighing hundreds of millions of tons are disposed of in specific cyanide residue landfills (SCRL) worldwide. The degradation characteristics of cyanide in the anoxic environments of closed landfills may have been overestimated, leading to an underestimation of the long-term risk of cyanide residue landfills. Given this, a total of 387 cyanide residue samples were collected for analysis from nine closed SCRLs in North China that have been closed for more than 10 years. According to the findings, the probability of achieving the target cyanide concentration (5 mg/L) in the nine sites was only 2.9%, with no significant reduction in the overall concentrations compared to the pre-closure period. The effectiveness of the SCRL containment barrier needs to be maintained for at least 220 years to ensure that cyanide concentrations degrade to harmless levels. Except for SCRLs A and B, the remaining seven sites had a low short-term risk, but in the long term exposure concentrations can exceed the groundwater Class III water quality limit by a factor of 1.64−30, posing a risk of groundwater contamination. This study reveals the risk of cyanide residue degradation in SCRLs and its long-term evolution, providing theoretical support for site management and risk control. © 2022, The Authors. All rights reserved.

关键词： Groundwater

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Sex-specific reproductive toxicity of subacute exposure to glufosinate-ammonium in zebrafish (Danio rerio)

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Science of the Total Environment 2025年 963卷 178489页

作者： Zhou, Weiqi Dang, Yao Zhang, Yang Chen, Xichao Li, Wei Lei, Xishuang Wang, Jianghua College of Fisheries Huazhong Agricultural University Wuhan430070 China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China Hubei Engineering Technology Research Center for Aquatic Animal Disease Control and Prevention Wuhan430070 China

Glufosinate-ammonium (GLA) is a common agricultural herbicide used worldwide. It can be transported into water bodies and can persist for long periods, posing a risk to non-target aquatic organisms. In this study, adult zebrafish were exposed to GLA (0, 0.6, 6, and 60 mg/L) for 21 days to evaluate its effect on reproduction. Fecundity, offspring development, sex hormone levels, histological changes, and apoptosis in the gonads were measured, and the expression levels of genes related to the hypothalamic-pituitary-gonadal-liver (HPG-L) axis, the cell cycle, and apoptosis were examined to assess the toxic mechanisms of GLA. Higher GLA concentrations were measured in the ovaries than in the testes. Decreases in spawning count, sperm density, and motility were observed. Meanwhile, the offspring survival rate decreased, and larval offspring swimming behavior was inhibited. GLA exposure significantly increased estradiol levels in females and reduced testosterone levels in males by affecting the expression of HPG-L axis genes. Furthermore, GLA exposure induced apoptosis in gonadal cells by controlling the expression of genes involved in cell cycle regulation and apoptotic pathways. Notably, the smaller effects of GLA concentration on body weight, gonad somatic index value, gonadal cell composition, and gonadal cell apoptosis were observed in male fish than in female fish. Taken together, GLA can accumulate in the gonads and cause sex-specific alterations in the expression of genes involved in the HPG-L axis and subsequent steroidogenesis and gametogenesis, which may be responsible for GLA-induced reproductive and developmental toxicities. © 2025 Elsevier B.V.

关键词： Macroinvertebrates

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Enhanced Orr Performance with N-Doped Pt@Ni-Ac Composites Towards Highly Active and Stable Catalysts

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SSRN 2024年

作者： Mushtaq, Muhammad Umair Lin, Zhu Li, Danni Ayub, Khurram Shahzad Abbas, Zain Zaman, Waqas Qamar Yang, Ji School of Resources and Environmental Engineering State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai200237 China Department of Chemical Engineering University of Gujrat Hafiz Hayat Campus Gujrat50700 Pakistan Sector H‑12 Main Campus Islamabad44000 Pakistan Research Centre Forward Sports Private Limited Sialkot Pakistan Shanghai Institute of Pollution Control and Ecology Security Shanghai20092 China

The sluggish oxygen reduction reaction (ORR) presents a critical bottleneck in many emerging electrochemical energy conversion technologies, demanding innovative catalysts to overcome kinetic limitations and optimize resource utilization. This study evaluated N-doped Pt nanoparticles supported on Ni-AC (activated carbon) as an ORR catalyst. Nanoparticles were synthesized through annealing Pt in an N2 atmosphere, followed by clustering the Pt Ni-coated AC. Electrochemical results showed that Pt-Ni compositions optimized better ORR performance. Among the catalysts examined, Pt0.25Ni0.75-AC demonstrated superior activity, followed closely by Pt0.15Ni0.85-AC, exhibiting marked halfwave potential (799 and 710 mV) specific activities (69.39 and 56.09 Ag-1) and minimal Tafel slope (-63 and -88 mV dec-1) against Pt-AC (636 mV vs. RHE, 40.2 Ag-1 mV and -88 mV dec-1), respectively. Markedly, in long-term stability testing over 40,000 cycles, Pt-AC suffered performance fluctuations while Pt0.25Ni0.75-AC retained over 90% of its initial activity. This highlights the stability enhancement imparted by the Ni incorporation. XAS and XPS validated the incorporation of Ni while SEM, and HRTEM with three-dimensional imaging confirmed the Pt clustering on the Pt Ni-coated AC and formation of a layered structure. Overall, results confirm N-doped Pt clusters supported on Ni-AC as highly active and robust oxygen reduction catalysts. © 2024, The Authors. All rights reserved.

关键词： Nickel alloys

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Enhancing the Fenton-Like Degradation of Organic Contaminants with Silicate-Iron in Aquifer Media by Ascorbic Acid

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SSRN 2023年

作者： Yuan, Ying Shi, Junxiang Xie, Weisong Wang, Guangwei Wang, Yang Tang, Jun Lu, Haojie State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China Guizhou Academy of Environmental Science and Design Guiyang550081 China Tianjin Branch Tianjin300450 China

In this study, silicate-iron (FeSi-ox, FeAlSi-ox) in aquifer media was utilized as an original iron source in groundwater to systematically investigate the effects of ascorbic acid on the degradation of p-nitrophenol (PNP) in the in-situ Fenton-like reaction. Silicate-iron in the aquifer media increased the PNP removal rate by activing H2O2 following the addition of ascorbic acid. The optimal removal rate of PNP was nearly 89% within 40 h, which was 6.8 times higher than that without ascorbic acid. In addition to PNP, some other common pollutants, such as nitrobenzene, trichloromethane, and trichloroethylene, can also be effectively degraded and mineralized. The suitable pH range for the silicate-iron Fenton-like system with ascorbic acid was 5-9, indicating that it is feasible in near-neutral or alkaline groundwater environments. The main functional free radicals were hydroxyl free radicals (•OH), which were produced slowly but continuously. In this novel Fenton-like system, dissolved Fe played a major role in H2O2 decomposition and pollutant degradation. The main mechanism underlying the increased strength of the degradation was the ability of ascorbic acid to facilitate the dissolution of surface Fe from aquifer media and accelerate the cycling of Fe(Ⅲ)/Fe(Ⅱ) in the liquid phase. © 2023, The Authors. All rights reserved.

关键词： Ascorbic acid

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Long-Term Effect of Wetting-Drying Cycles on the Bioavailability of Cuo Nanoparticles in the Paddy Soil

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SSRN 2022年

作者： Guo, Minxue Tong, Hong Cai, Dongqing Yuan, Peng Shen, Yihao Peng, Cheng College of Environmental Science and Engineering Donghua University Shanghai201620 China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resource and Environmental Engineering East China University of Science and Technology Shanghai200237 China

The extensive application of metal-based nanoparticles can pose environmental risks, but how the alternation of wet and dry caused by natural precipitation and artificial irrigation affects the environmental fate of nanoparticles is still unclear. Here, we investigated the underlying mechanisms of wetting-drying cycles (WDCs) on the bioavailability of CuO nanoparticles in paddy soil during 140 days by comparing with drought and flooding conditions. The results show that soil moisture content directly determined the soil pH and redox potential. The bioavailable Cu contents in the WDCs exposed to CuO nanoparticles were positively correlated to moisture content and WDCs number. The fit result of the pseudo-second-order equation indicates that WDCs greatly disturbed the aging process of CuO nanoparticles in soil. Furthermore, WDCs transformed oxidizable Cu to water-soluble, acid extractable and reducible Cu. WDCs markedly promoted the degradation of dissolved organic matter and the transformation of acid-soluble sulfate to water-soluble inorganic sulfate, meanwhile, significantly enhanced the concentration of crystalline iron oxides, but reduced the level of ferrous iron compared to the flooding. µ-XRF analysis shows that the fate of CuO nanoparticles might be mainly determined by Fe under WDCs condition but by S in flooded soil. © 2022, The Authors. All rights reserved.

关键词： Redox reactions

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Influences and Mechanisms of Aging and Rainfall on the Immobilization of Magnesium-Aluminum Modified Biochar to Heavy Metals in Mining Soils

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SSRN 2022年

作者： Zhang, Wei Li, Qiannan Liang, Weiyu Wang, Gehui Wan, Jiang Song, Huihui Peng, Cheng Qiu, Yuping Fu, Rongbing State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resource and Environmental Engineering East China University of Science and Technology Shanghai200237 China College of Environmental Science and Engineering Tongji University Shanghai200092 China

At present, the remediation of heavy metal-contaminated soils with metal nanoparticle-modified biochar has received extensive attention, but few literatures have reported the effects of aging and rainfall on it. In this study, we investigated the influences of dry-wet cycle (DW) and freeze-thaw cycle (FT) on the immobilization of arsenic (As), lead (Pb), and cadmium (Cd) in soil by magnesium- aluminum modified biochar (biomass addition of 5 g, MAB-5). The longitudinal migration risks of three heavy metals in the MAB-5 remediated soils under rainfall were also assessed. The results showed that MAB-5 was oxidized in both DW and FT, and its crystal structure had also changed. Furthermore, the immobilization efficiency of MAB-5 on the three metals was decreased in DW, but promoted in FT. In the simulated rainfall leaching experiment, the concentrations of As and Cd in the effluents of the treated groups were lower than those of the untreated group. It was also found that the cumulative release of As changed from the first-order kinetic model to the optimal model of the double constant velocity model after adding MAB-5. The correlation analysis illustrated that the existence of MAB-5 weakened the positive correlation between As and pH, but enhanced the positive correlation between Cd concentration and pH, EC of the effluents. In the soil column, the contents of the three metals in the contaminated part of the treatment group were higher than those of the untreated group. All of these indicated that the presence of MAB-5 suppressed the longitudinal migration of the three metals in the soils. © 2022, The Authors. All rights reserved.

关键词： Soils

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The Efficient Capture of Polysaccharides in Tetradesmus Obliquus of Indole-3-Acetic Acid Coupling Sludge Cextraction

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SSRN 2023年

作者： Yu, Jiayu Ding, Biao Li, Renjie Chen, Xiurong Yin, Danning Song, Meijing Ye, Xiaoyun National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China

Polysaccharide is an important biomass of algae. The sludge extract is beneficial to the enrichment of polysaccharide due to the abundance of organic matter, while its organic toxicity has an inhibitory effect on algae. To overcome inhibition and improve polysaccharide enrichment,, Tetradesmus obliquus were cultured with sludge extract with different indole-3-acetic acid (IAA) concentrations. Within 30 days of culture cycle, T. obliquus showed in good condition at the IAA dosage content of 10-6 M, the maximum cell density and dry weight were respectively (106.78 ± 2.20) × 106 cell/mL and 2.941 ± 0.067 g/L while the contents of chlorophyll-a, chlorophyll-b and carotenoid were 1.79, 1.91 and 2.80 times that of blank group, respectively. The highest polysaccharide accumulation was obtained under this culture condition, reaching 533.15 ± 21.11 mg/L on the 30th day, which was 2.49 times of that in blank group. Proteomic showed that the up-regulation of A0A383WLM8 promoted the light capture capacity, A0A383WMJ2 and A0A249RWW6 enhanced the accumulation of NADPH and ATP. The up-regulation of A0A383WMK4 promoted the fixation of carbon dioxide and thus the accumulation of polysaccharide. Above findings provide new insights into the mechanism of sludge toxicity removal of T. obliquus and the enhancement of polysaccharide accumulation effect under different concentrations of IAA. © 2023, The Authors. All rights reserved.

关键词： pH

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