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2005～2007年连续3年5次采集辽宁省粮食、蔬菜主产区地下水样品1000余个,利用TU-1810DASPC紫外可见光光度计测定硝酸盐含量。结果表明:粮食、蔬菜主产区地下水硝酸盐含量平均值为17.37mgL-1,硝酸盐含量小于20mgL-1的样品占70.53%,大于20mgL-1的样品占29.47%。保护地蔬菜产区农户饮用水硝酸盐含量平均值为21.19mgL-1,个别的蔬菜种植户地下水硝酸盐含量达到396.67mgL-1,超出国家安全饮用水标准15倍以上。水稻产区地下水硝酸盐含量平均值为19.14mgL-1,玉米产区地下水硝酸盐含量为14.21mgL-1。部分监测区域地下水硝酸盐含量超出安全饮用水标准13.0%～28.1%。不同县区地下水硝酸盐含量超标率排序为新民市53.75%>开原市42.35%>辽中县41.75%>黑山县33.46%>北镇市31.51%>铁岭县28.87%>昌图县28.33%>新城子区12.50%>于洪区10.00%>苏家屯区9.00%。
From 2005 to 2007, the groundwater sample of more than 1000 grain and vegetable producing areas in Liaoning Province was collected for 5 times in a row for 3 consecutive years. The nitrate content was determined by TU-1810DASPC UV-Vis photometer. The results showed that the average content of nitrate in groundwater was 17.37mgL-1 in grain-vegetable production area, 70.53% in nitrate content was less than 20mgL-1, and 29.47% in sample of more than 20mgL-1. The average nitrate content in drinking water of farmers in protected vegetable producing areas was 21.19mgL-1. The nitrate content in groundwater of individual vegetable growers reached 396.67mgL-1, more than 15 times the national safe drinking water standard. The average nitrate content of groundwater in rice-producing areas was 19.14mgL-1, while the nitrate content in groundwater of maize producing areas was 14.21mgL-1. The nitrate content of groundwater in some monitoring areas exceeded the standard of safe drinking water by 13.0% -28.1%. The nitrate content of groundwater in different counties exceeded the standard of 53.75% for Xinmin, 42.35% for Kaiyuan, 41.75% for Liaozhong, 33.46% for Heishan, 31.51% for Beizhen, 28.87% for Tieling, 28.33% for Changtu, Sub-district 12.50%> Yuhong District 10.00%> Sujiatun District 9.00%.