河南省浅层地下水中“三氮”的分布及成因分析

近期调查结果表明，河南省浅层地下水氮的污染以硝酸盐氮（NO3^-N）和亚硝酸盐氮（NO2^-N）为主，超标区主要分布于人口较为集中、工农业较为发达、地下水开发利用程度较高的黄淮海平原中部和南阳盆地，面积分别占平原区总面积的24%、15%。硝酸盐氮（NO3^-N）污染有逐渐加重的趋势，已经出现了硝酸根型地下水。其原因主要为“工业三废”和城市生活污水的排放及农药化肥的不合理施用。

Distribution and Analysis of Formation Causse of "Three-Nitrogens" of Shallow Groundwater in Henan Province

Based on actually investigation of water quality in plain area of Henan Province in recent years,nitrogen pollution in shallow groundwater is main nitrate-nitrogen(NO-3-N)and nitrite-nitrogen(NO-2-N).The over standard districts of nitrogen pollution are situated in the middle Huang-huai-hai plain and Nanyang basin,where the population is denser,industry and agriculture are developed and utilization degrees of groundwater is better,and their total area is about 24% and 15% of plain areas.The pollution of nitrate-nitrogen(NO-3-N)is gradually worse,nitrate radical groundwater has been found.The reason of pollution worse is free stack of industrial three-wastes,city domestic wastewater and over used fertilizers and pesticides.