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水环境的硝酸盐污染是一个全球性环境问题。识别水环境中硝酸盐的来源及其转化,对更好地管理水质是十分重要的。硝酸盐的稳定氮氧同位素组成可有效识别水环境中NO 3-来源及其转化。本文总结了典型的测定硝酸盐中稳定氮氧同位素组成的方法:石墨燃烧法、AgNO3-离子交换法、细菌反硝化法、亚硝酸盐去除联合细菌反硝化法、两步化学还原法、连续选择性细菌还原法,同时对这些方法的优缺点进行了评述。最后分析了检测技术中存在的共同问题及其发展方向:δ18O精确度仍有提高的潜力;把NO 3-从水中独立提取出来进行三氧同位素的测试方法还需改进和提高;水样的采集、保存有待进一步改进。
Nitrate pollution of the aquatic environment is a global environmental problem. Identifying the source and conversion of nitrate in the aquatic environment is important to better manage water quality. Nitrate stable nitrogen and oxygen isotope composition can effectively identify the water environment NO 3 source and its conversion. This article summarizes the typical methods for determining the composition of stable nitrogen and oxygen isotopes in nitrate: graphite combustion, AgNO3-ion exchange, bacterial denitrification, nitrite removal combined with bacterial denitrification, two-step chemical reduction, continuous selection Bacterial reduction method, at the same time the advantages and disadvantages of these methods were reviewed. Finally, the common problems existing in the detection technology and its development direction are analyzed. The accuracy of δ18O still has the potential to be improved. The test method of extracting NO3 from water to carry out the test of oxygen isotope must be improved and improved. , Save for further improvement.