摘要
华北地下水中硝态氮浓度（ｍｇＮ／ｌ）和δ１５Ｎ值（％，ａｉｒ）如下：在自然状态下为４．４和≤＋５，来自下水道粪便污染者为２０－７０和＋１０－＋２０，受化肥污染者为３０－６０和－２－＋５。因此。
Shallow groundwater is the nitrogen reservoir (converge) at continent. In north China, nitrate concentrations (mg N/l) and δ 15 N values (%, air) of groundwater are as follows: 4.4 and +5 (in the raw), 20-70 and +10-+20 (from sewer leakage), 30-60 and -2-+5 (from chemical fertilizer). So, nitrogen isotopes can be used to distinguish among different poliution sources and nitrogen transformations.
基金
地质矿产部环境地质开放实验室支持项目
