| 利用稳定同位素追踪石家庄市地下水中的硝酸盐来源 |
| 摘要点击 4522 全文点击 3182 投稿时间：2008-12-29 修订日期：2009-02-25 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 地下水污染 反硝化作用 硝酸盐 同位素 |
| 英文关键词 groundwater pollution denitrification nitrate isotope |
|
| 中文摘要 |
| 采用硝酸盐δ 5N和δ 18O相结合的方法对石家庄市地下水中的NO-3来源、反硝化作用的发生进行了识别，并结合氚分布特征对其污染深度进行了讨论.结果表明，该区地下水中硝酸盐的δ 5N/δ 18O比值大约是2∶1，说明发生了一定程度的反硝化作用；反硝化作用后硝酸盐的δ 5N和δ 18O值的范围分别为4.6‰～13.9‰和1.9‰～7.8‰，通过校正分析，判定其NO-3主要来源于当地的化肥和动物粪肥；同时NO-3随深度的分布关系表明该区的污染范围仅局限于浅部，污染深度<150 m，这与氚含量所反映的现代水循环深度相对应. |
| 英文摘要 |
| A dual isotope method of measuring both the δ 5N and δ 18O in NO-3was used to discriminate the origin of nitrate and its denitrification in groundwater in Shijiazhuang. Furthermore, the contaminated depth was discussed by tritium. The results show that the ratio of δ 5N/δ 18O in NO-3 is close to 2∶1, indicating that some denitrification is occurring in this area; The value of δ 5N and δ 18O in NO-3 after denitrification are 4.6‰-13.9‰ and 1.9‰-7.8‰ respectively, which indicates that the main source of nitrate in groundwater are local fertilizer and Animal Waste/Septic Systems. The relationship between NO-3concentration and the depth also shows that the pollution depth is less than 150 m, which is corresponding to the depth of active recharge zone indicated by tritium content. This implies the shallow aquifer above 150m is vulnerable to pollution. |
