大连市地下水中硝酸盐氮含量状况及影响因素

Nitrite nitrogen content situation and its influence factor in groundwater of Dalian city

用离子色谱法对大连地区11眼地下监测水井中硝酸盐氮的含量进行测定。实验结果表明：大连地区地下水中硝酸盐氮普遍存在，其浓度范围为8．23-61．25mg／L。11眼地下监测水井中仅有4眼井硝酸盐氮浓度小于饮用水标准规定的最大允许浓度（20mg／L），硝酸盐氮超标率达63．6％。造成大连地区地下水硝酸盐氮超标最主要的原因是化肥农药等有机质的过度使用，此外地下水的埋藏深度也对硝酸盐氮的含量变化影响较大。

The ion chromatography is used to determine the nitrite nitrogen content in groundwater samples comes from the eleven underground monitoring wells in Dalian. The test result shows that the nitrite nitrogen are prevalent in groundwater of Dalian area, the concentration is between 8.23~61.25 mg/L. Only in four well samples,the Nitrite nitrogen concentration are less than the maximum permissible concentration(20 mg/L) of drinking water standards, then the over standard rate of nitrite nitrogen can reach 63.6%. The excessive use of organic matter,including the fertilizers and pesticides, is the main reason to cause the over standard of nitrite nitrogen in groundwater of Dalian area, in addition, the buried depth of groundwater has great effect on the content change of the nitrite nitrogen.