辽宁省粮菜主产区农村饮用水硝酸盐污染状况研究

为了解农村饮用水硝酸盐污染情况，2005-2008年连续4年7次采集辽宁省粮食、蔬菜主产区农户井水样品1307个，利用TU-1810DASPC紫外可见光光度计测定了硝酸盐含量。结果表明，粮食、蔬菜主产区农村饮用水硝酸盐含量平均值为18．96mg·L^-1，大于20mg·L^-1的样品占32．08％。保护地蔬菜产区农户饮用水硝酸盐含量平均值为21．26mg·L^-1，个别的蔬菜种植户地下水硝酸盐含量达到396．67mg·L^-1。水稻产区农村饮用水硝酸盐含量平均值为20．62mg·L^-1，玉米产区农户饮用水硝酸盐含量为17．8mg·L^-1。受硝酸盐污染的水井占监测水井总数的百分比分别为：昌图县34．52％、开原市49．63％、铁岭县38．92％、新民市52．68％、辽中县39．82％黑山具3242％和北镇市32．99％．

Investigation of Nitrate Pollution in Rural Drinking Water of Liaoning Province

1 307 underground water samples were sampled for 7 times in the main foodstuff and vegetable regions of Liaoning province from 2005 to 2008, and nitrate content was determined with an ultraviolet-visible spectrophotometer（TU-1810DASPC ） to investigate the nitrate pollution of rural drinking water. The results showed that the average nitrate content was 18.96 mg·L^-1 in rural drinking water of the main foodstuff and vegetable regions, and 32.08%of the total samples was found that nitrate content was more than 20 mg·L^-1. In detail, the average nitrate content was 21.26 mg·L^-1, 20.62mg·L^-1 and 17.8 mg·L^-1 in the main vegetable, rice and corn production regions, respectively, with the largest nitrate content reaching 396.67 mg·L^-1 in some vegetable samples. Nitrate content differed with the depth of drinking water. In general, the lower the nitrate content, the deeper the drinking water. The nitrate content in less than 30 m well, 20.03mg·L^-1, was greatly higher than that in 30-100 m and more than 100 m wells, 9.47mg·L^-1 and 0.09mg·L^-1, respectively. The percentage of the nitrate-polluted well in total investigated wells was Changtu county 34.52%, Kaiyuan city 49.63%, Teiling county 38.92%, Xinmin city 52.68%, Liaozhong county 39.82%, Heishan county 32.42% and Beizhen city 2.99%.