自动化顶空平衡-气相色谱法测定京杭运河中溶解甲烷

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Abstract A new head-space gas chromatography system equipped with a flame ionization detector and method was self-assembled and established, which could automatically and simultaneously measure concentrations of dissolved methane and carbon dioxide in water samples, with wider linear range and low operating cost. Precision and accuracyof this system for CH₄ were better than 0.16% and 0.02%, respectively, which met the measurement requirements. In August 2022, dissolved CH₄ concentration and related parameters were observed in the Beijing-Hangzhou Grand Canal in Hangzhou City. Results showed that mean dissolved CH₄ concentration was (642.4±423.3) nmol/L, mean saturation was (22310±14701)% and mean air-water CH₄ flux was (548.57±603.70)mmol/(m²×d) during field survey, indicated the observed area was a net source of atmospheric CH₄. In addition, it was reasonable to estimate that the mean daily release rate of CH₄ from the Canal was approximate 1710mol, which was equivalent to 38.31m³ of natural gas or 82.94kg of carbon.

Key words： head space gas chromatograph Beijing-Hangzhou Grand Canal methane flux

Received: 27 July 2023

PACS:

X511

Corresponding Authors: 臧昆鹏,副研究员,zangkunpeng@zjut.edu.cn E-mail: zangkunpeng@zjut.edu.cn

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	WEN Jun
	ZANG Kun-peng
	PAN Feng-mei
	SHEN Xiao-long
	WEI Kang-xuan
	LAN Wen-gang
	HU Zhi-wei
	CHEN Xiao-ming
	CHEN Bing-jiang
	LI Shan
	LU Yan-ran
	CHEN Li-han
	GUO Peng
	FANG Shuang-xi
	LIN Yi
	CHEN Yuan-yuan
	LIU Shuo
	XU Hong-hui

Cite this article:

WEN Jun,ZANG Kun-peng,PAN Feng-mei等. Determination of dissolved methane in the Beijing-Hangzhou Grand Canal using automated head space-GC system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1507-1514.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I3/1507

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