铀矿地质样品中有机碳的测定

ANALYSIS OF ORGANIC CARBON IN SAMPLES FROM URANIUM DEPOSITS

用盐酸预处理岩矿样品以驱除样品中的碳酸盐碳；滤出酸不溶物并洗净，待干燥后置入900-1000℃的管式炉中，在富氧气流中灼烧，有机碳被氧化成CO2由烧碱石棉吸收后称重，根据烧碱石棉管的增重计算有机碳的含量。对含有机碳为0．23％的样品进行10次测定，标准偏差为0．0116％，变异系数为5．04％。

Pretreated with HCl,the carbonate carbon is removed from the rock sample. Filter the insoluble residue and wash it. After drying, put it into a tube furnace at about 900-1000℃. Burning it in oxygen-rich flow,the organic carbon is oxidized forming carbon dioxide which is absorbed by basic asestos. According to the added weight of basic asbestos tube,the content of organic carbon can be calculated. Sample that contains 0. 23 % organic carbon has been analysed ten times. The standard deviation is 0. 0116 %,and the variation coefficient is 5. 04%.