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用 Ｈ２ Ｓ Ｏ４ Ｋ２ Ｃｒ２ Ｏ７ 氧化有机碳， 在１２０℃以上， Ｃｌ－ 对尿素氧化起催化作用，造成明显的正干扰。沸水浴重铬酸钾法氧化有机碳，在１００℃左右，尿素碳不被氧化， Ｃｌ－ 可定量扣除， 有机碳氧化率为８２％ 左右， 校正后回收率达１０１７％ ， 测定值变异系数 Ｃ Ｖ≤２８％ 。此法适合有机无机肥料中有机碳的测定。
Oxidation of organic carbon with H2S04-K2Cr2O7 catalyzed the oxidation of urea at temperatures above 120 ° C, resulting in significant positive interference. Boiling water bath potassium dichromate oxidation of organic carbon at about 100 ℃, urea is not oxidized, Cl-quantitative deduction, organic carbon oxidation rate of about 82%, the corrected recovery of 101.7%, the measured value of variation Coefficient C V ≦ 2 8%. This method is suitable for determination of organic carbon in organic and inorganic fertilizers.