贵州某锑冶炼厂周边农田土壤锑、砷污染与人体健康风险评估
Contamination and Human Health Risks of Sb and As in Farmland Soils around a Typical Antimony Smelter in Guizhou, China
查看参考文献34篇
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文摘
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本研究以贵州省独山县某锑冶炼厂周边农田土壤为研究对象,系统采集17个土壤样品,测定了土壤中Sb、As总含量,并采用生理提取试验(PBET)和简化生物可给性提取试验(SBET)两种体外胃肠模拟实验方法分析了土壤中Sb、As的生物可给态含量,基于土壤Sb、As总量和生物可给性(PBET和SBET)评估了研究区锑、砷污染土壤暴露引起的潜在人体健康风险。结果表明:研究区农田土壤锑、砷污染严重,土壤中Sb(55.63±75.59 mg/kg)和As(44.31±38.34 mg/kg)的平均含量均超过贵州省区域背景值和我国农用地土壤污染风险筛选值;土壤中SBET和PBET提取的生物可给态Sb和As含量和计算得到的生物可给性都较低,大多数样品的生物可给性低于40%。相对于元素总量,基于Sb和As生物可给性(PBET和SBET)的人体非致癌风险(HQ和HI)和致癌风险(CR)均显著降低,其中成人和儿童的非致癌风险值均降至安全值范围,但是As的致癌风险除了CR_(SBET-成人)降至安全水平,CR_(PBET-成人)、CR_(SBET-儿童)以及CR_(PBET-儿童)值仍处于1.0E-06~1.0E-04之间,表明As对当地成人和儿童的潜在致癌风险仍不容忽视,特别是儿童。 |
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其他语种文摘
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A total of seventeen farmland soils around an antimony smelting plant in Dushan County, Guizhou Province, Southwest China, were taken for the determination of total Sb and As, and the bioavailable contents of Sb and As by two often used protocols, the physiologically based extraction test (PBET) and simplified bioaccessibility extraction test (SBET). Based on the total amount and calculated bioavailability (PBET and SBET), the potential human health risks caused by exposure to Sb and As in local farmland soil were evaluated. The results showed that Sb and As pollution was serious in farmland soil samples collected from the study area, and the average contents of Sb (55.63±75.59 mg/kg) and As (44.31±38.34 mg/kg) in soil exceeded the regional background values of Guizhou Province and the rick screening values of contaminated agricultural soil in China. The bioaccessible contents of Sb and As in soil determined by SBET and PBET and the calculated bioaccessibility of Sb and As were both lower than 40% for most samples, albeit the bioaccessibility of Sb and As by PBET are higher than those by SBET. Compared with the total amount of elements, the non-carcinogenic risk revealed by hazard quotation (HQ) and hazard index(HI), and the carcinogenic risk (CR) based on bioaccessibility (PBET and SBET) decreased significantly, and the HQ and HI for adults and children were all reduced to the safe range. However, only CR_(SBET-adults) for As fallen down to the safe level, while CR_(SBET-children), CR_(SBET-adults) and CR_(PBET-children) for As were still higher than the safe level (1.0E-6 to 1.0E-4). Attention should be paid to the potential carcinogenic risks of As to local residents, especially for children. |
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来源
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地球与环境
,2021,49(6):673-683 【核心库】
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DOI
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10.14050/j.cnki.1672-9250.2021.49.058
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关键词
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锑
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砷
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生物可给性
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农田土壤
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人体健康风险评估
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地址
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1.
贵州民族大学生态环境工程学院, 贵阳, 550025
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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中国科学院大学, 北京, 100049
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广州大学环境科学与工程学院, 广州, 510006
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重庆地质矿产研究院, 重庆, 401120
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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环境污染及其防治 |
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基金
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国家重点研发计划项目
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国家自然科学基金项目
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贵州省项目
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文献收藏号
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CSCD:7122213
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