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
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.
Keywords：soil and sediment; high frequency infrared carbon sulphur instrument; organic matter
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.