临淄地区地下水中氮的水文地球化学行为

The Hydrogeochemical Action of Nitrogen in the Groundwater of Linzi Area

临淄地区地下水普遍受到氮的污染其主要形式为ＮＯ３－、ＮＯ２－和ＮＨ４＋三种溶解离子态。这三种离子在包气带及其上部土壤层中产生交换吸附及氧化还原现象。实验表明：该区土壤对ＮＨ４＋的吸附净化率达９９％以上，且吸附量由层表向下递减；同时有Ｃａ２＋等被解吸，导致地下水总硬度增高，其总硬度与Ｃａ２＋的历时曲线完全相似；氮在包气带中的氧化还原反应主要表现为一级硝化作用。

Ii's widespread that groundwater is polluted by Nitrogen in Linal area, and the main forms of the Nitrogen transport are NO3, NO2 and NH4.The statistical data of the eighty monitoring points of ground water pollution shows the following results: both the detedion probability of NO3 and the detection probability of NOZ are 100 percent; the above-standard probability of one and both is 57. 5 percent; both the detection probability and above standard probability of NH4 are low; the most content of NO3 is 143. 75milligram a iitre; the most content of NO2 is 0. 222 milligram a litre.In the seepage course of surface water dowmward, the three kinds of ionmake exchangeabsorption and oxidation-reduction in the aerated zone and its soil layer. The experiment shows that the adsorption - purification ration of soil to NH4 is more than 99 percent; that the adsorption capacity decreases by the depth of soil, and Ca2+ is desrpted at the same time, resulting in the increase of the total hardness of oroundwater; that the total haraness time cure and Ca2+-time curve are similar and the first step nitrification is the main oxidation-reduction reaction of Nitrogen in the aerated zone.