内蒙古自治区河套平原砷中毒高发区作物中砷的检测及健康风险评价Detection and Health Risk of Arsenic Species in Crops from Arsenic-Affected Areas of Hetao Plain,Inner Mongolia
佟俊婷;韦超;郭华明;
摘要(Abstract):
为了研究地方性砷中毒高发区作物中砷含量及其对人体健康的威胁,在内蒙古自治区河套平原4个自然村采集了72个谷物蔬菜水果、81份人体尿样和8个自来水样品。用高效液相色谱-电感耦合等离子体质谱(HPLC-ICP-MS)分析测定采集的样品中各形态砷及其含量;用ICP-MS分析测定消解后的作物样品中砷总量。结果表明,自来水中总砷含量均小于1.0μg·L-1。尿液样品中总砷含量为4.50~319μg·L-1(平均值为56.9μg·L-1),二甲基砷(DMA)是尿砷的主要形态(>70%)。作物中砷的主要形态有无机三价砷As(III)、无机五价砷As(V)和DMA。谷物和蔬菜水果中总砷含量的最大值分别为102和335μg·kg-1。成人和儿童最大日摄入砷量分别为232和205μg。通过分析采样地人体尿砷、作物砷和地方性砷中毒发病率的相关性得出,作物中砷的含量虽未明显超过国家标准,但对人体健康有明显的潜在威胁。政府改水后(饮用水由井水变为达标的自来水),人体的健康风险主要来自作物中的砷,而不是饮用水中的砷。
关键词(KeyWords): 内蒙古河套平原;砷形态;地方性砷中毒;健康风险
基金项目(Foundation): 国家自然科学基金(41222020,41172224);; 霍英东教育基金会基础研究(131017)
作者(Author): 佟俊婷;韦超;郭华明;
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DOI:
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