使用黄金进行大气样本采集的局限性和见解
Jan Gačnik1, Seth Lyman2, Sarrah M Dunham-Cheatham3
1Department of Natural Resources and Environmental Science, University of Nevada, Reno, USA.
金子测量大气中的 (Hg) 作为Hg0和HgII的混合物,由于吸附和不完全减少. 精确的量化需要特定的校准方法和上游设备,如热溶剂.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 大气化学 大气化学
背景情况:
- 大气中的 (Hg) 度通常使用金 (Au) 弹和热溶解原子光谱法进行测量.
- 泰克兰2537分析仪是行业标准,但关于它是否测量气态元素 (Hg) 或总气态 (TGM) 存在争议.
- 对大气Hg分析仪的现有Hg信号处理算法和校准方法提出了质疑.
研究的目的:
- 通过使用透管式校准器来研究收集在黄金弹上的的形式.
- 了解Tekran 2537B和2537X模型之间Hg信号处理的差异.
- 评估大气分析仪的各种Hg校准方法.
主要方法:
- 实验使用Hg0和HgII透校准器来评估黄金弹的性能.
- 分析了HgII采样和来自金的热溶解效率.
- 将Tekran 2537B和2537X模型的Hg0测量与不同的信号处理和校准技术进行比较.
- 评估了热溶剂对HgII测量的影响.
主要成果:
- HgII校准仪证明了可重复的透率.
- 金子测量了高达75%的HgII,由于吸附,最初的测量值明显较低.
- 热溶解只能将HgII的80%降低到Hg0;热溶剂将HgII的测量增加到97%.
- 与2537B型号不同,Tekran 2537X的性能独立于集成类型.
- 与透校准器校准相比,钟瓶校准低估了Hg度的6%±7%.与透校准器校准相比,钟瓶校准低估了Hg度的6%.
结论:
- 金子测量了由于吸附和不完全减少HgII的Hg0和TGM之间的大气分数.
- 准确的大气量化需要区分Hg0和TGM,因为HgII可以占Hg总量的25%.
- 对于TGM或Hg0测量,建议在黄金盒子的上游使用热溶剂或阴离子交换膜.
- 可追溯的多点校准对于量化至关重要,因为不同的校准方法产生不同的结果.
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