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- Title
高频燃烧红外吸收光谱法测定郑州 市郊土壤有机碳的含量.
- Authors
赵一帆; 毛香菊; 张宏丽; 孙启亮; 郭晓瑞; 倪文山
- Abstract
The content of soil organic carbon directly reflects soil fertility. Understanding the content of soil organic carbon in Zhengzhou is of great significance for the rational use and management of land in this city・ At present, the standard methods for determining the content of organic carbon in soil have strict requirements and a variety of reagents・ The experimental process requires a large amount of liquid solution circulation, which is not conducive to environmental protection・ The experiment process is complicated? which is easy to cause human error and not suitable for large-scale sample detectiori. In this work, a high-frequency infrared carbon and sulfur analyzer was employed to measure the accurate organic carbon content in the soil・ Single point linear correction method was used to calibrate the instrument. Iron filings and tungsten tin were mixed as a fluxing agent. Firstly, the total carbon content of the soil sample was determined・ Subsequently, the residual carbon content of the same sample after high-temperature burning was measured, and the total carbon content of the soil sample and the residual carbon content after burning were subtracted to obtain the organic carbon content of the sample ・ Finally, the symme tri cal sample volume, burning temperature, and flux dosage were optimized・ As a result, it was determined that the sample weight was 0・ 18一0・ 25 g, the burning temperature was 430 °C, and the burning time was 40 min; the flux was 0・ 5 g iron filings and 1・ 0 g tungsten tin mixed flux. Under the selected experimental conditions, the standard curve had good linearity, correlation coefficient(K2) was 0・ 999 6, the detection limit was 0・ 006%, and the limit of quantification was 0・ 02%・ The national standard material GBW07427 was used to draw the standard curve under the above parameters・ The experiment collected the soil under three different utilization/covering methods in the suburbs of Zhengzhou・ The samples were prepared according to the national standard(GB/T 36197一2018), and the results of the organic carbon content were determined according to the above-mentioned experimental methods・ This result was basically consistent with the industry standard method(NY/T 85一1988)・ The relative standard deviations(RSD, n = 11) of the three samples were 0・ 078%,0 ・ 10% and 0・ 14%, respectively 乡 and the recoveries of standard addition were 103 %, 105 % and 9& 38 %, respectively ・ Compared with traditional methods, the research method in this article has the advantages of simple pre-treatment, reduced use of harmful reagents, direct solid injection, environmental protection benefits, simple instrument operation process, and accurate determination results・ It is suitable for the detection of large quantities of soil quality detection samples・
- Subjects
NEW York (N.Y.); K2 (Pakistan : Mountain); ZHENGZHOU Shi (China); SOIL fertility; HUMAN error; SOIL quality; IRON; SOIL sampling; TUNGSTEN; CARBON in soils
- Publication
Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue, 2023, Vol 13, Issue 10, p1077
- ISSN
2095-1035
- Publication type
Article
- DOI
10.3969/j.issn.2095-1035.2023.10.005