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《化学分析计量》 2020年第06期
DOI:10.3969/j.issn.1008-6145.2020.06.017
高频红外碳硫仪测定土壤和沉积物中有机质
李源,尹肖尧,常钟元
核工业二三〇研究所,长沙 410007 
Determination of organic matter in soil and sediment by high frequency infrared carbon sulphur instrument
LI Yuan, YIN Xiaoyao, CHANG Zhongyuan
Research Institute No.230, CNNC, Changsha 410007, China 
摘要:建立高频红外碳硫仪测定土壤和沉积物中有机质的分析方法。用低浓度盐酸预处理样品,去除土壤和沉积物中的无机碳,利用氯化氢易溶于水的特性去除透水坩埚中残留的氯化氢,采用高频红外碳硫仪测量土壤和沉积物中的有机碳,从而换算出有机质含量。该方法检出限为0.039%,测定结果的相对标准偏差为1.26%~5.76%(n=6)。采用该方法对国家一级标准物质进行测定,测定值与标准值相符,相对偏差为0.29%~2.00%。该方法过程简单,快速,准确度高,可用于大批量土壤和沉积物样品中有机质的测定。  
Abstract:A method for determination of organic matter in soil and sediment by high frequency infrared carbon sulphur instrument was established. The samples were pretreated with low concentration hydrochloric acid to remove inorganic carbon in soil and sediment, and hydrogen chloride was easily dissolved in permeable crucible because hydrogen chloride was soluble in water. The organic carbon in soil and sediment was measured by high-frequency infrared carbon sulfur analyzer, and the result was converted to organic matter content. The detection limit of the method was 0.039%, and the relative standard deviation of the determination results was 1.26%-5.76%(n=6). The method was applied to the determination of national first class reference materials which the measured values were consistent with the standard values, and the relative deviations were 0.29%-2.00%. This method is simple, rapid and accurate, which can be used for the determination of organic matter in large quantities of soil and sediment samples. 
关键词:土壤和沉积物;高频红外碳硫仪;有机质 
Keywords:soil and sediment; high frequency infrared carbon sulphur instrument; organic matter 
本文引用格式:
李源,尹肖尧,常钟元.高频红外碳硫仪测定土壤和沉积物中有机质[J].化学分析计量,2020,29(6):75-78.
LI Y,YIN X Y,CHANG Z Y. Determination of organic matter in soil and sediment by high frequency infrared carbon sulphur instrument[J]. Chemical analysis and meterage,2020,29(6):75-78. 

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