盐酸熏蒸结合IC、EA-IRMS测定气溶胶硝酸盐中稳定氮同位素组成

论文总字数：21388字

目 录

1 绪论…………………………………………………………………1

1.1 生态系统氮循环与硝酸盐重要性……………………………………………………1

1.2 大气含氮物对生态系统的影响………………………………………………………1

1.3 气溶胶硝酸盐概述……………………………………………………………………2

1.4 气溶胶硝酸盐稳定N同位素分析意义和进展………………………………………2

1.5 气溶胶硝酸盐稳定N同位素测定方法进展…………………………………………4

1.6 研究目的和意义………………………………………………………………………4

1.7 研究内容和创新点……………………………………………………………………4

2 实验材料与方法……………………………………………………4

2.1 样品采集 ………………………………………………………………………………4

2.2 实验材料………………………………………………………………………………5

2.3 样品分析………………………………………………………………………………5

2.3.1 水溶性阴阳离子分析检测……………………………………………………5

2.3.2 稳定同位素分析检测…………………………………………………………6

2.4 方法原理和步骤 ………………………………………………………………………7

2.5 数据处理和校正………………………………………………………………………8

2.6 数据处理和分析工具…………………………………………………………………9

2.7 数据质量控制和质量保证……………………………………………………………9

2.7.1 实验分析质量控制……………………………………………………………9

2.7.2 数据质量控制和保证…………………………………………………………9

2.7 方法检测………………………………………………………………………………9

3 结果与讨论…………………………………………………………9

3.1 盐酸熏蒸处理的效率分析和对铵盐的影响…………………………………………9

3.2 盐酸熏蒸处理时间的确定……………………………………………………………11

3.3 铵盐含量对硝酸盐去除率的影响……………………………………………………11

3.4 盐酸熏蒸处理过程的同位素分馏情况………………………………………………13

3.5 真实采样样品的硝酸盐δ¹⁵N…………………………………………………………14

4 结论…………………………………………………………………14

4.1 主要结论………………………………………………………………………………14

4.2 研究成果及意义………………………………………………………………………15

4.3 研究局限及展望………………………………………………………………………15

参考文献 ………………………………………………………………15

致谢 ……………………………………………………………………18

盐酸熏蒸结合IC、EA-IRMS测定气溶胶硝酸盐中稳定氮同位素组成

杨笑影

，China

Abstract： It is very important to understand the atmospheric chemical reactions, climate change and global nitrogen cycle from the properties and migration features of nitrogen contents in Aerosols and it has become the hotspot and frontier of atmospheric environment and global change research.

Our study is a method design to measure the stable isotopic composition in aerosol nitrate nitrogen by using hydrochloric acid fume treatment to separate nitrates and others, measuring δ¹⁵N of total nitrogen and other nitrogen contents except nitrate, δ¹⁵N of nitrate nitrogen is calculated by the quality subtraction, base on which we can get the following conclusions:

1. The fume treatment can remove 99.96% of nitrate hydrochloride.

2. Hydrochloric acid fumigation processing time is 16 hours.

3. The content of ammonium salt does not affect the removal rate of nitrate.

4. Isotope fractionation is hardly happen in Hydrochloric acid fumigation process

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