氧化燃烧—气相色谱法测定土壤中的有机碳含量

doi:10.11720/wtyht.2020.1589

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Abstract

Soil organic carbon (SOC), as an important element to be analyzed in multi-purpose regional geochemical survey, affects the migration and transformation of other elements in the soil. Therefore, it is a significant index in evaluating the soil quality. The traditional methods of measuring SOC include potassium dichromate oxidation method and combustion method.The former is complicated to operate in practical application and there is also some pollution to the environment. Through the pretreatment of soil with H₃PO₄ to remove the interference of inorganic carbon, and the detailed discussion of the best conditions in the working process of the analytical instrument, which include the temperature of the oxidation furnace, oxygen adding quantity, oxygen pressure and the carrier gas pressure and some other factors, an analytical method for the direct solid injection and determination of total organic carbon in soil by oxidative combustion and gas chromatographywas established and optimized in this paper. The experimental results show that the correlation coefficient R² of this method is 0.9999, and the detection limit is 0.012%. According to the verification of the Certified Reference Materials for the Chemical Composition of Soils, the measured value is consistent with the certified value with the precision of 1.10%~4.11% (n=12). This method has the advantages of high efficiency and simple operation, and is suitable for the determination of organic carbon in different types and values of soil samples.

Key words： soil organic carbon oxidative combustion gas chromatography

Received: 16 December 2019 Published: 29 December 2020

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Corresponding Authors: XU Jin-Li E-mail: 524682527@qq.com;80368070@qq.com

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	Articles by authors
	Meng-Ying HU
	Jin-Li XU
	Ying-Tao ZHU
	Peng-Peng ZHANG
	Ling-Huo ZHANG
	Hong-Na XU
	Jin-Feng BAI
	Qin ZHANG

Cite this article:

Meng-Ying HU,Jin-Li XU,Ying-Tao ZHU, et al. A method for determination of total organic carbon in soil by oxidative combustion and gas chromatography[J]. Geophysical and Geochemical Exploration, 2020, 44(6): 1435-1440.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1589 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I6/1435

Working principle of the instrument

Relationship between furnace temperature and signal intensity of carbon

Relationship between oxygen adding quantity and the ratio of measured value to the certified value

Relationship between oxygen pressure and the ratio of measured value to the certified value

Relationship between carrier gas pressure and the ratio of measured value to the certified value

Instrument parameter setting

Standard curve of carbon

Precision of the method

Accuracy of the method

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