硫酸银催化容量法快速测定土壤中的有机碳  

DETERMINATION OF ORGANIC CARBON IN SOIL SAMPLES BY VOLUMETRIC ANALYSIS WITH SILV ER SULFATE CATALYST

作　　者：肖国拾[1] 陈博[2] 苏克[1] 

机构地区：[1]吉林大学测试科学实验中心,吉林长春130026 [2]吉林大学化学学院,吉林长春130026

出　　处：《吉林大学学报（地球科学版）》2003年第2期249-251,共3页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目 ( 4 0 0 72 0 13)

摘　　要：在硫酸溶液中 ,以Ag2 SO4为催化剂 ,加入过量K2 Cr2 O7标准溶液氧化土壤中的有机碳 ,然后用FeSO4标准溶液滴定剩余的K2 Cr2 O7标准溶液 ,返滴定法测定有机碳含量。实验测得S为0 .0 186 (n =15 ) ,RSD %为 3.6 0 ( X =0 .5 18% ) ;测定土壤和水系沉积物等国家标准物质中有机碳的含量 ,相对误差小于 11.5 %。In sulfuric acid solution, organic carbon was oxidized by ove r- amounts potassium dichromate with silver sulfate as a catalyst. The extra potass ium dichromate was quantitatively reduced by ferrous sulfate standard solution. The standard deviation and relative error were 0.018 6( n =15) and 3.60%. Determination of organic carbon in soil standard materials, the relative error o f the mentioned method was less than 11.50%.

关 键 词：硫酸银 容量法 土壤 催化剂 有机碳 化学容量分析 硫酸亚铁 

分 类 号：S153.62[农业科学—土壤学]