样品预处理对来自大气硫酸盐的BaSO4中氧和硫的同位素组成的影响
Masako Kagawa1, Nagayoshi Katsuta1, Sayuri Naito1
1Faculty of Education, Gifu University, Gifu, Japan.
Rapid communications in mass spectrometry : RCM
|November 13, 2023
概括
为大气样本优化硫酸盐 (BaSO4) 制备,可以增强硫 (δ34S) 和氧 (δ18O) 同位素分析. 在预处理期间避免酸 (HCl) 确保硫酸盐同位素的准确结果.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 同位素地球化学 同位素地球化学
背景情况:
- 从大气样本 (雨,雪,气溶) 中制备硫酸 (BaSO4) 是稳定同位素分析 (δ18O和δ34S) 的关键.
- 目前的方法需要优化,以提高测试时间和成本效益.
研究的目的:
- 调查各种样品预处理对δ18O和δ34S值的影响.
- 优化从硫酸 (Na2SO4) 溶液和大气沉样本中制备BaSO4.
主要方法:
- 从Na2SO4溶液中制备BaSO4,使用不同的方法:蒸发度,蒸发到干燥,蒸发加盐酸 (HCl).
- 在用乙二胺酸 (DTPA) 和染色分离预处理BaSO4后,对大气沉样本进行了 δ18O 的分析.
- 测量同位素比 (δ18O和δ34S) 使用连续流元素分析仪与同位素比质谱仪相连.
主要成果:
- 在没有添加HCl的方法中, δ34S值一致 (±0.5‰).
- δ18O值与蒸发度或蒸发到干燥一致 (±0.2‰).
- 酸盐添加增加了 δ18O 值,而 DTPA 处理的 BaSO4 显示与染色分离一致 (±0.5 ‰).
结论:
- 预处理方法 (酸化,加热,缩,干燥) 不会显著影响取硫酸盐中的 δ18O 和 δ34S 值.
- 在加热之前避免添加HCl,并在BaSO4中使用DTPA进行δ18O分析是准确结果的关键.
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