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一种改进的方法,用于对天然水样本中溶解的有机碳的同位素和定量分析

Yuhong Li¹, Mingshi Wang¹, Dong Zhang²

¹School of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, China.

Water science and technology : a journal of the International Association on Water Pollution Research

|April 28, 2024

概括

这项研究增强了湿化学氧化,用于在自然水中精确分析溶解有机碳 (DOC) 和其碳同位素 (δ13C-DOC). 改进的方法确保了低度样本的准确性,节省了时间,并使批处理成为可能.

科学领域:

环境化学环境化学
同位素地球化学同位素地球化学
分析化学分析化学

背景情况:

湿化学氧化 (WCO) 是溶解有机碳 (DOC) 和 δ13C-DOC 分析的标准.
由于二氧化碳的氧化不完全,通常在含有低DOC度的自然水中观察到低精度.
现有的方法需要提高准确性和效率,特别是在微量级分析方面.

研究的目的:

改进湿化学氧化方法,以提高DOC和δ13C-DOC测量的精度.
为了解决分析含有低DOC度的自然水样的局限性.
为了优化样品体积,去除溶解无机碳 (DIC),并最大限度地减少程序空白.

主要方法:

增加了用于分析的水样体积.
改善了用于去除溶解无机碳 (DIC) 的技术.
从标准溶液中最大限度地减少空白溶解有机碳 (DOC).

主要成果:

标准化DOC溶液的 δ13C比率与实际值一致 (差异<0.2‰).
增强方法证明了对自然水的良好准确性和稳定性 (DOC ≥0.5 mg L-1).
获得的精度在DOC度上优于0.07 mg L-1和在δ13C比率上优于0.1 ‰.

结论:

改进的WCO方法显著提高了DOC和 δ13C-DOC分析的精度和准确性.
这种方法适用于自然水样,即使是那些含有低DOC度的水样.
该程序减少了预处理时间,并允许对水样进行高效的批量处理.

关键词:

水生环境水生环境水生环境碳同位素的比率是什么溶解无机碳的去除方法溶解的有机碳是什么?湿氧化方法是湿氧化方法.

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