河北省某县饮用水硝酸盐污染状况及其影响因素分析

郭占景; 杨玲; 范尉尉; 白萍; 赵伟; 陈风格; 梁建伟; 李贺

河北省某县饮用水硝酸盐污染状况及其影响因素分析

Nitrate Contamination of Drinking Water and its Influencing Factors of a County in Hebei Province

摘要

摘要:
目的了解河北省某县饮用水硝酸盐污染状况及其影响因素。
方法采取分层随机抽样方法抽取80个监测点, 在枯水期和丰水期采集并检测了160份出厂水样。
结果在枯水期和丰水期饮用水硝酸盐含量范围分别为6.02~40.91 mg/L和3.17~39.82 mg/L, 硝酸盐含量超标率分别为28.75%和22.50%;上寨乡饮用水硝酸盐超标率最高, 其次为白鹿泉乡, 上庄镇未超标; 在不同的土地利用类型中农区地下水硝酸盐含量最高, 其次为村庄; 随着地下水深度的增加, 硝酸盐含量呈下降趋势, 200 m以上的水井地下水硝酸盐含量最低, 为11.57 mg/L; 水井周围污染源对地下水硝酸盐含量有影响。
结论该县饮用水硝酸盐污染较重, 应加强重点区域含氮有机物控制。

Abstract:
Objectives To explore the nitrate contamination of drinking water and its influencing factors in a county of Hebei Province.
Methods Eighty survey spots were selected by stratified random sampling method, and 160 water samples were collected and tested both in dry season and wet season.
Results The concentration of nitrate in drinking water was 6.02~40.91 mg/L in dry season and 3.17~39.82 mg/L in wet season; and the exceeding standard rates for nitrate in drinking water were 28.75% and 22.50% in dry and wet seasons respectively. The highest exceeding standard rate for nitrate in water samples was in Shangzhai town, the next high rate was in Bailuquan town, and all water samples from Shangzhuang town were qualified. The concentration of nitrate in groundwater from farming areas was the highest, and that from villages was the next. The concentration of nitrate in groundwater was declined with the increase of the depth of water source; and the concentration of nitrate decreased to 11.57 mg/L in groundwater from wells deeper than 200 meters. Pollution around the well was the source of nitrate in groundwater.
Conclusions Drinking water was seriously polluted by nitrate in the county, which indicated that some measures should be taken to control the pollution of nitrogen-containing organic substances in key areas.

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