A simple and accurate method for determining accurately dissolved inorganic carbon in seawaters

	A simple and accurate method for determining accurately dissolved inorganic carbon in seawaters
	Song, JM; Li, XG ; Li, N ; Gao, XL; Yuan, HM; Zhan, TR
	2004-12-01
发表期刊	CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
ISSN	0253-3820
卷号	32 期号:12 页码:1689-1692
文章类型	Article
摘要	Dissolved inorganic carbon (DIC) account for more than 95% of total carbon in seawater, so it is necessary to make reliable and precise measurements of DIC to study marine carbon cycling. In order to establish a simple and speed method, an airproof device of gas extraction-absorption was designed. Finally a simple method was developed for the determination of DIC in seawater through a large mount of experiments. The determination procedure is as follows: 100 similar to 150 mL seawater was put into conical flask, then add 10% H3PO4, the DIC in seawater sample was dissolved to form CO2 gas and carried by pure N-2, then the CO2 gas was absorbed by two grades 0.1 mol/L NaOH solution. Finally the absorbed solution was titrated by HCl standard solution of 0.01000 mol/L with the end points detected with the indicator phenolphthalein and bromocresol green-methyl red mixture. The precision and accuracy of the method were satisfied. This method was used to analyse seawater samples from Jiaozhou bay in June, 2003. The result shows that the average DIC in surface seawater is 2066 mumol/L, DIC in bottom seawater is 2075 mumol/L inside bay, but the average DIC in surface seawater is 1949 mumol/L, DIC in bottom seawater is 2147 mumol/L outside bay.; Dissolved inorganic carbon (DIC) account for more than 95% of total carbon in seawater, so it is necessary to make reliable and precise measurements of DIC to study marine carbon cycling. In order to establish a simple and speed method, an airproof device of gas extraction-absorption was designed. Finally a simple method was developed for the determination of DIC in seawater through a large mount of experiments. The determination procedure is as follows: 100 similar to 150 mL seawater was put into conical flask, then add 10% H3PO4, the DIC in seawater sample was dissolved to form CO2 gas and carried by pure N-2, then the CO2 gas was absorbed by two grades 0.1 mol/L NaOH solution. Finally the absorbed solution was titrated by HCl standard solution of 0.01000 mol/L with the end points detected with the indicator phenolphthalein and bromocresol green-methyl red mixture. The precision and accuracy of the method were satisfied. This method was used to analyse seawater samples from Jiaozhou bay in June, 2003. The result shows that the average DIC in surface seawater is 2066 mumol/L, DIC in bottom seawater is 2075 mumol/L inside bay, but the average DIC in surface seawater is 1949 mumol/L, DIC in bottom seawater is 2147 mumol/L outside bay.
关键词	Dissolved Inorganic Carbon Seawater Titrimetry Jiaozhou Bay
学科领域	Chemistry, Analytical
收录类别	SCI
语种	英语
WOS记录号	WOS:000226245500030
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2740
专题	海洋生态与环境科学重点实验室海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Song, JM,Li, XG,Li, N,et al. A simple and accurate method for determining accurately dissolved inorganic carbon in seawaters[J]. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY,2004,32(12):1689-1692.
APA	Song, JM,Li, XG,Li, N,Gao, XL,Yuan, HM,&Zhan, TR.(2004).A simple and accurate method for determining accurately dissolved inorganic carbon in seawaters.CHINESE JOURNAL OF ANALYTICAL CHEMISTRY,32(12),1689-1692.
MLA	Song, JM,et al."A simple and accurate method for determining accurately dissolved inorganic carbon in seawaters".CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 32.12(2004):1689-1692.

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