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一个用于同时实时确定N-丰富氨,氧胺,酸盐和酸盐的新系统

Jing Wei¹, Zheyan Zhou¹, Yunjie Zhang¹

¹Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China.

Analytical chemistry

|December 19, 2024

概括

研究人员使用15N追踪开发了一种新的系统,用于实时分析四种关键化合物 (氨,氧胺,酸盐和酸盐). 这种4n-ASSP-MIMS系统能够更快,更准确地测量循环过程.

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:

活性物种,包括氨 (NH4+),胺 (NH2OH),酸盐 (NO2-),酸盐 (NO3-),在循环中至关重要.
同时实时确定这些四种化合物的15N丰富形式仍然是一个重大的分析挑战.

研究的目的:

开发和验证一种新的分析系统,用于快速,同时和在线确定,氧胺,酸盐和酸盐的15N分量.
提供一个实时同位素追踪循环过程的工具.

主要方法:

自动同步样品制备装置与膜入口质谱仪 (ASSP-MIMS) 的合.
在线15N分数分析的4n-ASSP-MIMS系统的开发.
验证系统的检测极限和15N确定精度的验证.

主要成果:

4n-ASSP-MIMS系统实现了20.22 μM (NH4+),0.38 μM (NH2OH),0.17 μM (NO2-) 和0.25 μM (NO3-) 的检测极限.
对于15N分数的确定,相对误差在5%以内,对于15N缩超过5原子%的15N.
该系统成功地捕获了生物地球化学转换期间的实时同位素信号.

结论:

开发的4n-ASSP-MIMS系统是第一个在线分析工具,用于实时追踪关键物种的15N.
这一进步将大大提高对循环机制的理解.
该系统提供了对变化的快速和准确的见解.

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