Atmospheric Pollution Research
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2018
·
IF 2.152
Longchao Liang,Zhidong Xu,Guangle Qiu,Pan Wu,Ruixue Zhang
Arsenic (As) is considered a carcinogenic toxin, and nonferrous metal smelting activities can release significant quantities of As, causing an increase in As levels in the environment. A total of 221 samples of moss belonging to 5 species in 4 families were collected from the Wanshan District, the world third largest mercury mining area, in Guizhou Province, southwestern China, for analysis of total As (tAs) concentrations and As speciation. The results indicated that the tAs concentrations in these mosses ranged from 0.67 to 9.6 mg kg −1 , with an average of 2.4 ± 1.7 mg kg −1 . The dominant species of As in these mosses were inorganic forms of arsenite (As(III)) and arsenate (As(V)) with a total percentage of 87%, whereas the concentrations of organic forms (monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA)) were relatively low, with percentages of 11.8% and 6.0%, respectively. A significant correlation (r = 0.766, p < 0.01) was observed between As(V) and tAs. In the spatial distribution pattern of As, high concentrations of As in mosses were centralized around historical Hg retorting sites in the town of Wanshan, the villages of Gouxi and Yanwuping and sites downwind of these locations, suggesting that historical intensive Hg mining activities might be the most possible source of atmospheric As.
研究领域:
环境科学
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植物学
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生态毒理学
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DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 6
·1785
·
IF 4.412
Zhe Jiang,Nian Li,Pei-Ying Li,Bo Liu,Hua-Jie Lai,Tao Jin
Chitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent[email protected]3O4was synthesized by a one-step method using carboxymethyl chitosan (CMC) and ferric salts under relatively mild conditions. The Fe3O4microspheres were formed and the core–shell structure of[email protected]3O4was synthesized in the meantime, which was well characterized via SEM/TEM, XRD, VSM, FT-IR, thermo gravimetric analysis (TGA), XPS, size distribution, and zeta potential. The effects of initial arsenic concentration, pH, temperature, contact time, and ionic strength on adsorption quantity of inorganic arsenic was studied through batch adsorption experiments. The magnetic adsorbent[email protected]3O4displayed satisfactory adsorption performance for arsenic in water samples, up to 20.1 mg/g. The optimal conditions of the adsorption process were pH 3.0, 30−50 °C, and a reaction time of 15 min. The adsorption process can be well described by pseudo-second-order kinetic model, suggesting that chemisorption was main rate-controlling step. The Langmuir adsorption model provided much higher correlation coefficient than that of Freundlich adsorption model, indicating that the adsorption behavior is monolayer adsorption on the surface of the magnetic adsorbents. The above results have demonstrated that chitosan-based magnetic adsorbent[email protected]3O4is suitable for the removal of inorganic arsenic in water.Keywords:chitosan;adsorption;magnetic adsorbents;inorganic arsenic
研究领域:
环境科学
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材料科学
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水处理
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DOI
PubMed
高影响因子
Foods
·
2024
·Vol. 13
·期 17
·2741
·
IF 4.7
Di Zhao
Arsenic (As) contamination in rice is a global public health concern, particularly in Asian countries where rice is the staple food. Current health-based limits for As in rice are typically derived from total As concentrations, resulting in overly stringent values. This study aimed to determine As bioaccessibility in rice, estimate dietary intakes of inorganic As (iAs) at different consumption rates, evaluate the cancer and non-cancer risks associated with iAs exposure through rice consumption, and assess the feasibility of deriving more accurate health-based limits for As in rice after incorporating rice As bioaccessibility. Bioaccessibility of As ranged from 60.7% to 104.5% in rice samples. Estimated iAs intake varied from 0.04 to 1.40 μg/kg BW/day at rice consumption rates of 100–300 g/day. Incorporating rice As bioaccessibility resulted in lower iAs intake estimates of 0.03–1.18 μg/kg BW/day. The non-cancer and cancer risks associated with iAs exposure are concerning for populations with higher rice consumption rates and elevated rice iAs concentrations. Health-based limits for iAs in rice for different regions across China are discussed after incorporating rice As bioaccessibility. This study contributes to the development of regional or national safety limits for As in rice, based on As bioaccessibility in rice.
研究领域:
环境科学
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公共卫生
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毒理学
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DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
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IF 4.872
Rongtao Lyu,Zhixiang Gao,Deliang Li,Zhaoguang Yang,Ting Zhang
The bioaccessibility of total arsenic (tAs) and arsenic species in Bellamya aeruginosa collected from Xiangjiang River was evaluated using an in vitro digestion model, to assess the potential health risks to local residents. The tAs concentrations in gastropod samples ranged from 1.98 to 6.33 mg kg −1 (mean 3.79 ± 1.60 mg kg −1 ). Five arsenic species including arsenite [As(III)], arsenate [As(V)], dimethylarsinic acid (DMA), arsenobetaine (AsB), and arsenocholine (AsC) were detected. Inorganic arsenic (iAs) concentrations, which were about a half of organic arsenic (oAs), were higher than the maximum permissible limit (≤0.50 mg kg −1 in aquatic products). Bioaccessible concentrations of tAs in digestive juices were found to be decreased in the order: intestinal phase > gastric phase > salivary phase. As(III) and AsC were the predominant species, but AsB was not detectable in all digestive juices. Bioaccessible iAs concentrations, which were close to the level of bioaccessible oAs, were not significantly different among three digestive juices, but also above 0.50 mg kg −1 . Accordingly, bioaccessibility of tAs was highest in intestinal phase (48%), then in gastric phase (40%), and lowest in salivary phase (33%). Bioaccessibility of As(III) was close to 100%, and bioaccessibility of iAs was much higher than that of oAs. The mean values of target hazard quotient (THQ) and bioaccessible THQ were 0.80 and 0.70, respectively. The probability of experiencing non-carcinogenic effects was reduced to 18% down from 22% as considering iAs bioaccessibility. The mean values of carcinogenic risk (CR) and bioaccessible CR were higher than the acceptable value (1 × 10 −4 ). Gastropod consumption from sampling sites may cause a potential carcinogenic risk.
研究领域:
环境科学
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毒理学
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公共卫生
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2018
·
IF 4.946
Peng Li,Yushi Pan,Yong Fang,Mengjia Du,Fei Pei,Fei Shen,Baocai Xu,Qiuhui Hu
Shellfish consumption is an important pathway for coastal residents exposure to inorganic arsenic (iAs) and methylmercury (MeHg). An integrated method had been developed for simultaneous determination of iAs and MeHg in shellfish with microwave-assisted extraction and high performance liquid chromatography-inductively coupled plasma mass spectrometry identification. The limits of detection were 0.0520, 0.1003 and 0.0015 mg/kg (dry weight) for As III , As V and MeHg, respectively. The proposed method was applied to evaluate the contents and health risks of iAs and MeHg in shellfish from the typical coastal cities (Lianyungang and Yantai) in China. The concentrations of iAs and MeHg in fresh shellfish were 0.10–1.69 mg/kg and 0.46–6.38 μg/kg, respectively. The target hazard quotient and target cancer risk values of iAs were the highest for the children and adults in Lianyungang, and were respectively larger than 1 and 1 × 10 −4 , indicating both non-carcinogenic and carcinogenic risks of iAs exposure were significant in this area.
研究领域:
环境科学
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毒理学
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食品安全
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DOI
PubMed
高影响因子
Journal of Environmental Sciences
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2016
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IF 2.208
Suqi Li,Jing Xu,Wei Chen,Yingtan Yu,Zizheng Liu,Jinjun Li,Feng Wu
p -Arsanilic acid ( p -ASA) is widely used in China as livestock and poultry feed additive for promoting animal growth. The use of organoarsenics poses a potential threat to the environment because it is mostly excreted by animals in its original form and can be transformed by UV–Vis light excitation. This work examined the initial rate and efficiency of p -ASA phototransformation under UV-C disinfection lamp. Several factors influencing p -ASA phototransformation, namely, pH, initial concentration, temperature, as well as the presence of NaCl, NH 4 + , and humic acid , were investigated. Quenching experiments and LC–MS were performed to investigate the mechanism of p -ASA phototransformation. Results show that p -ASA was decomposed to inorganic arsenic (including As(III) and As(V)) and aromatic products by UV-C light through direct photolysis and indirect oxidation. The oxidation efficency of p -ASA by direct photosis was about 32%, and those by HO and 1 O 2 were 19% and 49%, respectively. Cleavage of the arsenic–benzene bond through direct photolysis, HO oxidation or 1 O 2 oxidation results in simultaneous formation of inorganic As(III), As(IV), and As(V). Inorganic As(III) is oxidized to As(IV) and then to As(V) by 1 O 2 or HO . As(IV) can undergo dismutation or simply react with oxygen to produce As(V) as well. Reactions of the organic moieties of p -ASA produce aniline, aminophenol and azobenzene derivatives as main products. The photoconvertible property of p -ASA implies that UV disinfection of wastewaters from poultry and swine farms containing p -ASA poses a potential threat to the ecosystem, especially agricultural environments.
研究领域:
环境科学
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毒理学
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DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Xiaobao Tuo,Yanhua Duan,Guanting Lin,Tianci Jiang,Wenhui Liu,Fangyi Chen,Xianjun Xie,Yan Zheng
Rapid screening of inorganic arsenic (iAs) in groundwater used for drinking by hundreds of millions of mostly rural residents worldwide is crucial for health protection. Most commercial field test kits are based on the Gutzeit reaction that uses mercury-based reagents for color development, an environmental concern that increasingly limits its utilization. This study further improves the molybdenum blue (MB) colorimetric method to allow for faster screening with more stable reagents. More importantly, a portable three-channel colorimeter is developed for screening iAs relative to the WHO drinking water guideline value (10 µg/L). Adding the reducing reagents in sequence not only prolongs the storage time to > 7 days, but also accelerates the color development time to 6 min in conjunction with lowering the H 2 SO 4 concentration in chromogenic reagents. The optimal pH ranges from 1.2 to 1.3 and is achieved by acidifying groundwater to 1% ( V/V ) HCl. With detection limits of 3.7 µg/L for inorganic arsenate (iAs(V)) and 3.8 µg/L for inorganic arsenite (iAs(III)), testing groundwater with ∼10 µg/L of As has a precision < 20%. The method works well for a range of phosphate concentrations of 48–950 µg/L (0.5–10 µmol/L). Concentrations of total_iAs (6–300 µg/L), iAs(V) (6–230 µg/L) and iAs(III) (0–170 µg/L) for 14 groundwater samples from Yinchuan Plain, Pearl River Delta, and Jianghan Plain, are in excellent agreements (linear regression slope: 0.969–1.029) with the benchmark methods. The improved chemistry here lays the foundation for the MB colorimetric method to become a commercially viable screening tool, with further engineering and design improvement of the colorimeter.
研究领域:
环境科学
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公共卫生
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DOI
PubMed
高影响因子
BIOMEDICAL AND ENVIRONMENTAL SCIENCES
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2017
·
IF 2.204
Sha Li YU,Ling Fei XU,Jun Xia WU,Chen Juan YAO,Qiao Yun HU,Chun Xue ZHANG,Xin Yuan ZHAO,Hai Yan WEI,Xiao Ke WANG,Gang CHEN
Objective This study aimed to investigate the susceptibility of mice with streptozotocin(STZ)-induced diabetes mellitus (TIDM) to the uptake of pentavalent inorganic arsenic (iAs V ) and the possible molecular mechanism. Methods TIDM was induced in mice by STZ. TIDM and normal mice were treated with 15.0 mg/kg Na 2 HAsO 4 ·12H 2 O by intragastric administration. Then, the concentrations of arsenic in various tissues were measured by atomic fluorescence spectrometry. The gene expression levels of Pit1 and Pit2 were quantified by real-time RT-PCR, and their protein levels were detected by Western blotting in mouse heart, kidney, and liver tissues. Results The concentrations of arsenic in STZ-induced TIDM mouse tissues were higher at 2 h after intragastric administration of Na 2 HAsO 4 ·12H 2 O. Compared with the levels in normal mice, PIT1 and PIT2, which play a role in the uptake of iAs V , were upregulated in the livers and hearts of TIDM mice. PIT1 but not PIT2 was higher in TIDM mouse kidneys. The upregulation of Pit1 and Pit2 expression could be reversed by insulin treatment. Conclusion The increased uptake of iAs V in TIDM mouse tissues may be associated with increased PIT1 and/or PIT2 expression.
研究领域:
药理学
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毒理学
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内分泌学
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分子生物学
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PubMed
高影响因子
Toxics
·
2024
·Vol. 12
·期 1
·83
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IF 3.9
Kunyu Zhang,Yunyi Yin,Man Lv,Xin Zhang,Meichen Zhang,Jia Cui,Ziqiao Guan,Xiaona Liu,Yang Liu,Yanhui Gao,Yanmei Yang
Limited studies have demonstrated that inorganic arsenic exposure is positively associated with serum vitamin D levels, although the correlation between urinary arsenic species and serum vitamin D has not been investigated in areas of water-borne arsenicosis. A cross-sectional study of 762 participants was conducted in Wenshui Country, Shanxi Province, a water-borne arsenicosis area. The results showed a positive relationship between urinary arsenic species (inorganic arsenic (iAs), methylarsonic acid (MMAV), dimethylarsinic acid (DMAV) and serum 25(OH)D. Log-binomial regression analysis indicated a 0.4% increase in the risk of vitamin D excess for every 1-unit increment in the Box–Cox transformed urinary DMAVafter adjustment for covariates. After stratifying populations by inorganic arsenic methylation metabolic capacity, serum 25(OH)D levels in the populations with iAs% above the median and primary methylation index (PMI) below the median increased by 0.064 ng/mL (95% CI: 0.032 to 0.096) for every one-unit increase in the Box–Cox transformed total arsenic (tAs) levels. Serum 25(OH)D levels increased by 0.592 ng/mL (95% CI: 0.041 to 1.143) for every one-unit rise in the Box–Cox transformed iAs levels in people with skin hyperkeratosis. Overall, our findings support a positive relationship between urinary arsenic species and serum 25(OH)D. It was recommended that those residing in regions with water-borne arsenicosis should take moderate vitamin D supplements to avoid vitamin D poisoning.
研究领域:
公共卫生学
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营养学
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毒理学
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DOI
PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 8
·1-13
·
IF 6.4
Shi Lin,Zhan Cetao,Bai Wenjing,Wang Wei,Yuan Shoujun,Hu Zhen-Hu
Arsanilic acid ( p -ASA), an organoarsenic additive found in livestock wastewater, can release toxic inorganic arsenic into the environment. While bioelectrochemical systems have proven effective in decomposing organoarsenics, managing the resulting inorganic arsenic remains a challenge. This study demonstrated the feasibility of a two-stage bioelectrochemical process designed to facilitate p -ASA degradation and in situ recover inorganic arsenic from contaminated livestock wastewater. It consisted of two sequential stages: (I) anodic stimulation for p -ASA degradation and (II) reversing electrode polarities for the cathodic reduction of inorganic arsenic. In Stage I, the anode significantly enhanced the degradation of p -ASA, resulting in 18 μg/L of As(III) and 700 μg/L of As(V) released into the bulk solution. In Stage II, the cathode further reduced the As(III) and As(V) to 8.9 and 35.5 μg/L, respectively, through the synergistic action of the cathode and suspended microbes. The inorganic arsenic was recovered as a layer of As(V)-O on the cathode. Microbial analysis indicated that Alcaligenes was responsible for the degradation of p -ASA, while Anaerobacillus and Desulfitibacter played key roles in reducing As(V) and As(III) on the cathode, respectively. This study provided a promising alternative approach for the removal of organoarsenics and in situ recovery of inorganic arsenic from organoarsenic-bearing wastewater.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 19
·16429-16439
·
IF 2.741
Yao Lixian,Huang Lianxi,Bai Cuihua,He Zhaohuan,Zhou Changmin
Roxarsone (ROX), a widely used feed organoarsenic additive, occurs as itself and its metabolites in animal manure that is commonly land used as fertilizer. Soil property impacts arsenic (As) speciation and bioavailability. Fourteen soils across China were used to conduct culture experiments to investigate As uptake by garland chrysanthemum ( ChrysanthemumL coronarium ), with the soils fertilized with chicken manure bearing ROX and its metabolites. The results show As(III) was the sole As form in garland chrysanthemum shoots, and As(III) and As(V) occurred in roots. Only inorganic As was detected in all soils when the plants were harvested. Stepwise regression analysis shows soil-exchangeable Ca predominated shoot As(III) concentration (shoot As(III) = 1.60030 soil Ca, R
2 = 0.8832***). Therefore, ROX is transferred into the human food chain finally as inorganic As in plants. Application of animal manure bearing ROX and its metabolites is not recommended in Ca-rich soils to avoid excess inorganic As dietary exposure.
研究领域:
环境科学
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农学
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土壤化学
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植物生理学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Jing Zhou,Dongyan Deng,Yingying Su,Yi Lv
A novel approach based on cadmium ions assisted photochemical vapor generation (PVG) combined with atomic fluorescence spectrometry (AFS) was proposed for sensitive and accurate detection of total inorganic arsenic. In this work, the prereduction step of As(V) to As(III) was avoided. An approximate 10-fold improvement in sensitivity was achieved for both As(III) and As(V) with the existence of 20 mg L −1 Cd 2+ in the 30% (v/v) acetic acid solution for 60 s UV irradiation . Under the optimal experimental conditions, detection limits of 0.05 μg L −1 were obtained for As(III) and As(V). The relative standard deviations (RSD) of the 20 μg L −1 As(III)/As(V) standard solution from 11 times measurements were both within 2%. The accuracy of the proposed approach was verified by analyzing of several surface water samples using standard addition method, Yangtze river waters and Funan river waters, with recoveries from 94% to 105%, which were in good agreement with the results from ICPMS determination.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）