东北黑土地中碳赋存形态分析方法研究

ANALYSIS ON CARBON OCCURRENCE FORMS IN BLACK SOIL OF NORTHEAST CHINA

应用高频红外碳硫仪研究了东北黑土地中碳的赋存形态(全碳、有机碳),实验优化了样品称样量、纯铁纯钨助熔剂加入量等测试条件.结果表明:当样品称样量在0.05 g、纯铁助熔剂加入量为0.5 g、纯钨助熔剂加入量为1.0 g时,黑土地中碳形态分析测试效果最佳.用该方法对有证土壤标准物质进行分析,结果均在不确定度范围内,测量值与标准值相对误差在-5.00%~+2.69%之间,相对标准偏差(RSD)小于6.29%.应用该方法与地质矿产行业标准方法(DZ/T0279.27—2016)对黑土实际样品进行比较分析,测试结果基本一致,此方法适合东北黑土地中碳的赋存形态分析研究.

The occurrence forms of carbon(TC and C_(org))in black soil of Northeast China are studied by using high frequency infrared carbon-sulfur analyzer,with the optimization of test conditions such as sample weight and addition amount of pure iron and tungsten fluxes.It is concluded that the test result of carbon occurrence form in black soil is the best with 0.05 g of sample weight,0.5 g of pure iron flux amount of and 1.0 g of pure tungsten flux amount.The certified soil standard substances are analyzed by the above method,and the results are all within the range of uncertainty,with the relative error between measured value and standard value of-5.00%to+2.69%and relative standard deviation(RSD)less than 6.29%.The test results of actual black soil samples by the above method are basically consistent with those by the method of Geology and Mineral Industry Standard(DZ/T0279.27—2016),which is suitable for the analysis of carbon occurrence forms in black soil of Northeast China.