关中盆地浅层地下水氮污染的健康风险评价

Health risk assessment of "Three Nitrogen" in shallow groundwater in the Guanzhong Basin

摘要: 为了研究关中盆地浅层地下水氮污染对人体产生的潜在健康危害风险,在研究区采集和测试了232个水样,采用单因子污染指数法和健康风险评价模型对浅层地下水氮污染进行了评价。结果表明,在浅层地下水中硝态氮污染程度相对较重,呈面状分布;而铵态氮和亚硝态氮污染程度较轻,以点状存在。浅层地下水中硝态氮对人体健康的慢性毒害指数较高,高风险区占研究区面积的78.2%,主要分布在农业活动强烈的灌区和人口居住密集、工业相对发达的城镇区;硝态氮含量大于12.6mg/L的三类地下水对人体健康也是高风险的,即传统意义上可以饮用的三类水对人体健康并不都是安全的。上述成果对地下水资源管理和保护具有重要的参考价值。

Abstract: In order to investigate the risk of healthy hazards to human beings caused by "Three Nitrogen"in shallow groundwater in the Guanzhong Basin,232 water samples were gathered and detected.Based on the method of one-factor pollution index and the model of water environmental health risk assessment,the pollution degree and health risk in the study area were analyzed.The results show that the nitrate content was significantly higher than the content of ammonium nitrogen and nitrite.The nitrate present...