作者：范芳
作者单位：江西省农业科学院绿色食品环境检测中心, 江西 南昌 330200
关键词：有机肥; 水溶性碳; 方法
摘要：
论述了有机肥料中水溶性碳的测定方法,样品先经去离子水振荡浸提过滤处理,浸提液中的水溶性碳在加热条件下,用过量的重铬酸酸钾-硫酸溶液氧化水溶性有机碳,多余的重铬酸钾用硫酸亚铁标准溶液滴定,由消耗的重铬酸钾量按氧化校正系数计算出有机碳量。结果表明,此法回收率达96.1%~97.7%,变异系数为5.95%~7.4%。该方法操作简便,结果令人满意。
Method of detecting water-soluble carbon in organic fertilizer
FAN Fang
Monitoring Center of Green Food Environment, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
Abstract: This paper introduced a method of detecting the water-soluble carbon in organic fertilizer.The process was as follows:the sample was dipped in the deionized water and vibrating,filtrating,then the filtrated solution left,in which the water-soluble carbon was oxided by excessive compound solution of potassium bichromate and H2SO4 under the condition of heating.Subsequently,the redundant potassium bichromate was titrated by the standard ferrous sulfate solution,and the content of organic carbon was calculated by the oxide calibration coefficient and the amount of reactive potassium bichromate.The result indicated that the return-ratio reached 96.1%~97.7% and the coefficient of varation was less than 5.95%~7.4% through this method.In addition,the method is simple in operation process and the result is satisfying.
Keywords: Organic fertilizer; Water-soluble carbon; Method
2007, 33(4): 63-64141 收稿日期: 2006-6-22;收到修改稿日期: 2006-9-28
基金项目: 江西省农业科学院基金项目
作者简介: 范芳(1966-),女,江西南昌市人,高级实验师,主要从事分析化学与环境影响评价工作。
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