推进分析高湿度和低挥发性系统中的挥发性物种:一种新的物种化和量化方法
Xuefeng Yang1, Kang Mao2, Chuanyu Chang2
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|November 13, 2024
概括
本研究引入了一种新方法,用于捕获和测量湿田中的挥发性 (Se) 化合物,如二甲基化物 (DMSe) 和二甲基化物 (DMDSe). 优化的技术准确量化了这些排放,这对于了解循环至关重要.
科学领域:
- 环境化学环境化学
- 生物地质化学生物地质化学
- 分析化学 分析化学
背景情况:
- 挥发是在系统内的生物地球化学循环中的一个关键过程.
- 在高湿度,低挥发性田环境中捕获挥发性 (VOSe) 的现有方法是不够的.
- 准确量化VOSe对于了解对环境的命运和影响至关重要.
研究的目的:
- 开发和验证一种创新,准确和敏感的方法,用于在现场捕获和量化微量挥发性 (VOSe).
- 专门针对在水系统中的挥发性有机物种,如二甲基化物 (DMSe) 和二甲基化物 (DMDSe).
- 提供关于在具有挑战性的环境条件下挥发的生物地化学过程的见解.
主要方法:
- 优化采样装置,通过减少水蒸气 (43.5%) 和增加Se度 (37.7%) 来提高预缩效率.
- 完善高性能液体染色学-诱导合等离子体-质谱 (HPLC-ICPMS) 分析,包括列和移动相选.
- 实现了DMSe的1.2 pg和DMDSe的1.4 pg的绝对检测极限.
主要成果:
- 从土壤 (分别为16.55±9.94 ng·m−2·h−1和124.49±120.34 ng·m−2·h−1) 和大米植物 (分别为38.38±29.85 ng·m−2·h−1和72.54±94.66 ng·m−2·h−1) 中得到的量化DMSe和DMDSe挥发率.
- 检测到挥发性H2Se和其他潜在的植物性挥发性有机Se物种.
- 在高湿度,低挥发性条件下证明了该方法的有效性.
结论:
- 开发的方法是第一个准确和灵敏的方法,用于在具有挑战性的田环境中在现场捕获VOSe的痕迹.
- 这种技术为的生态化学循环提供了宝贵的见解,特别是挥发过程.
- 这些发现有助于更好地了解在农业系统中的环境行为.
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