覆盖沉淀容量法测定磷矿石中的磷  

Determination of Phosphorus in Phosphatic Rocks

作　　者：杨汉 刘水松 YANG Han;LIU Shuisong

机构地区：[1]洞庭湖环境监测站 [2]湖南建筑陶瓷厂

出　　处：《岩矿测试》1988年第4期291-293,共3页Rock and Mineral Analysis

摘　　要：本文研究了表面活性剂存在下,不经沉淀分离的EDTA络合滴定法间接测定磷。采用SLS和CCl_(4)联合覆盖BiPO_(4)沉淀,滴定终点敏锐、稳定。方法简便、快速,适用于磷矿石中磷的测定。对含P_(2)O_(5)18.13%的样品分析(n=9)RSD为0.58%。An excess of standard Bi(NO3)3 solution is added to react with phosphate and back titrated with EDTA.It was found that the end point turns sharp and stable on the addition of carbon tetrachloride and a surface active substance(SLS was the best choice among five surfactants tested)to cover the precipitated BiPO_(4).The method is simple,rapid and accurate.The relative standard deviation for 18.13% P_(2)O_(5) is 0.58%(n=9).

关 键 词：滴定终点 EDTA络合滴定法 容量法测定 磷矿石 沉淀分离 样品分析 表面活性剂 磷的测定 

分 类 号：O65[理学—分析化学]