An improved method for isotopic and quantitative analysis of dissolved organic carbon in natural water samples.

Autor: Li Y; School of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, China., Wang M; School of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, China., Zhang D; College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China E-mail: d-zhang@shou.edu.cn.
Jazyk: angličtina
Zdroj: Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2024 Apr; Vol. 89 (8), pp. 2060-2072. Date of Electronic Publication: 2024 Apr 04.
DOI: 10.2166/wst.2024.114
Abstrakt: A wet chemical oxidation (WCO) method has been widely used to obtain the dissolved organic carbon (DOC) content and carbon isotope ( δ 13 C DOC ) ratios. However, it is sometimes difficult to get high precision results because not enough CO 2 was oxidized from the natural water samples with low DOC concentrations. This improvement primarily aims to increase the water sample volume, improve the removal rate of dissolved inorganic carbon (DIC), and minimize the blank DOC from the standard solution. Following the improved procedure, the δ 13 C ratios of standardized DOC solutions were consistent with their actual values, and their differences were less than 0.2‰. The improved method demonstrated good accuracy and stability when applied to natural water samples with DOC concentrations ≥0.5 mg L -1 , with the precisions of DOC concentrations and δ 13 C ratios were better than 0.07 mg L -1 and 0.1‰, respectively. More importantly, this method saved much pre-treatment time and realized batch processing of water samples to obtain their DOC contents and isotope ratios.
Competing Interests: The authors declare there is no conflict.
(© 2024 The Authors This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/).)
Databáze: MEDLINE
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