重铬酸钾氧化-容量法测定土壤中有机质的方法改进  

Improvement of Potassium Dichromate Oxidation Volumetric Method for Determination of Organic Matter in Soil

作　　者：杜苗 钟慧琴 DU Miao;ZHONG Hui-qin(China Shaanxi Nuclear Power Group Comprehensive Analysis and Testing Co.,Ltd.,Xi’an 710024,China)

机构地区：[1]中陕核集团综合分析测试有限公司,陕西西安710024

出　　处：《化工管理》2021年第25期16-17,共2页Chemical Engineering Management

摘　　要：取定量样品,加入硫酸-重铬酸钾溶液氧化,经可控温电热板加热促进氧化效率,使土壤有机碳氧化,而重铬酸钾中六价铬(Cr^(6+))被还原成三价铬(Cr^(3+)),剩余的重铬酸钾用硫酸亚铁铵标准溶液滴定,根据有机碳被氧化前后重铬酸钾量的变化,计算出土壤中有机质的含量。Take quantitative soil samples,add potassium sulfate-chromium acid solution oxidation reaction,the oxidation efficiency is promoted by heating thermostatic plate.Soil organic carbonization,while hexavalent chromium in potassium chromium is reduced to trivalent chromium.The remaining potassium chromite is tired with standard solution of ferrite sulfate,the content of organic matter in soil is calculated according to the change of the standard solution of potassium chromium acid before and after the oxidation of organic carbon.

关 键 词：土壤有机质 重铬酸钾氧化 电热板加热 冷凝管冷凝 

分 类 号：P632[天文地球—地质矿产勘探]