Fluoride Occurrence and Human Health Risk in Drinking Water Wells from Southern Edge of Chinese Loess Plateau
Fluoride Occurrence and Human Health Risk in Drinking Water Wells from Southern Edge of Chinese Loess Plateau
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黄土高原南缘饮用水井氟化物赋存及人体健康风险
DOI：
10.3390/ijerph16101683
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发表时间：
2019-05-02
影响因子：
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通讯作者：
Ren, Wenhao
中科院分区：
文献类型：
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作者：
Jia, Hui;Qian, Hui;Ren, Wenhao
对中国黄土高原南缘几个含水层的氟化物水文地球化学及其对人类健康的影响进行了研究。局部有64%的黄土含水层浅层地下水样品超过氟化物限量（1.5 mg/L），最高达3.8 mg/L。目前，浅层地下水是家庭使用的私人水井的主要来源，这显然对人类健康构成潜在风险。利用水文地球化学和稳定同位素来阐明其赋存机制的多样性。地下水中氟化物的富集在很大程度上受含氟矿物溶解的控制。此外，碱性条件和脱钙过程促进了水岩相互作用。研究区水体氢、氧稳定同位素（δD和δ18O）表明，黄土含水层地下水存在时间较长。较长的停留时间引起充分的水岩相互作用，对氟化物矿物的溶解起重要作用。来自浅层黄土含水层的样本显示氟化物含量升高，这可能通过口服摄入对成人（60%）和儿童（94%）构成人体健康风险。为确保饮用水安全，需要实施推广除氟技术和优化供水战略等管理措施。
Fluoride hydrogeochemistry and associated human health risks implications are investigated in several aquifers along the southern edge of the Chinese Loess Plateau. Locally, 64% shallow groundwater samples in loess aquifer exceed the fluoride limit (1.5 mg/L) with the maximum of 3.8 mg/L. Presently, the shallow groundwater is the main source of private wells for domestic use, and this is clearly a potential risk for human health. Hydrogeochemistry and stable isotopes are used to elucidate the diversity of occurrence mechanisms. Enrichment of fluoride in groundwater is largely controlled by the F-containing minerals dissolution. Furthermore, alkaline condition and calcium-removing processes promote water–rock interactions. Stable isotopes of hydrogen and oxygen (δD and δ18O) in study area waters demonstrate that groundwater in loess aquifer is old, which means groundwater remains in the aquifer for a long time. Long residence time induces sufficient water–rock interactions, which play significant roles in the resolution of fluoride minerals. Samples from the shallow loess aquifer show elevated fluoride levels, which may pose human health risk for both adults (60%) and children (94%) via oral intake. To ensure drinking water safety, management measures such as popularizing fluoride-removing techniques and optimizing water supply strategies need to be implemented.