辽宁省蔬菜主产区地下水硝酸盐污染调查

Investigation on Nitrate Content in Underground Water in Main Vegetable Producing Regions of Liaoning Province

[目的]调查蔬菜主产区地下水硝酸盐污染情况。[方法]2005～2008年连续4年7次采集辽宁省蔬菜主产区农户井水样品696个，利用TU-1810DASPC紫外可见光光度计测定硝酸盐含量。[结果]蔬菜主产区地下水硝酸盐含量平均值为21．26mg／L，超过了国家制定的安全饮用水标准（〈20．00rr影L）。硝酸盐含量小于20．00mg／L的样品占66．80％，大于20．00ng／L的样品占33．20％。地下水硝酸盐含量超标率排序为北镇市（33．00％）〉黑山县（32．80％）。[结论]黑山县和北镇市监测区域内地下水硝酸盐含量超出国家标准的饮用水井达到1／3以上。

In order to investigate nitrate pollution in underground water in main vegetable production, 696 underground water samples in main vegetable production regions of Liaoning Province was collected 7 times from 2005 to 2008,nitrate content was analyzed with ultraviolet and visible spectrophotometer, TU- 1810DASPC. The results showed that the average nitrate content in underground water in main vegetable production regions was 21.26 mg/L, that was higher than drinking water quality criterion（ 〈 20.00 nag/L）. The underground water samples that nitrate content was less than 20.00 mg/L was 66.80% and more than 20.00 mg/L was 33.20%. The order of beyond standard ratio of nitrate content in underground water of different counties and distriets was Beizhen City （33.00%） 〉 Heishan County （32.80%）. The drinking water well in Heishan County and Beizhen City that nitrate content of underground water was beyond country drinking water quafity criterion covered more than one-third.