重量法测定毒重石中碳酸钡含量  

Determination of Barium Carbonate in Witherite by Gravimetric Method

作　　者：严海 杜顺林 吴光耀 赵卫东 曹重 段家华 YAN Hai;DU Shunlin;WU Guangyao;ZHAO Weidong;CAO Chong;DUAN Jiahua(Technical Center of Yuxi Xinxing Steel Co.,Ltd.,Yuxi,Yunnan 653100,China;Kungang Science and Technology Innovation Center,Anning,Yunnan 650302,China)

机构地区：[1]武昆股份玉溪新兴钢铁有限公司,云南玉溪653100 [2]昆钢科创中心,云南安宁650302

出　　处：《中国无机分析化学》2020年第6期33-36,共4页Chinese Journal of Inorganic Analytical Chemistry

摘　　要：为消除毒重石中少量碳酸钙、不溶性硅酸盐和硫酸钡等杂质对碳酸钡分析结果的影响,采用盐酸消解试样,慢速过滤消除硫酸钡及硅酸盐干扰;滤液在pH=4.5的弱酸环境中,与重铬酸钾溶液反应生成铬酸钡沉淀,过滤消除钙离子干扰,通过重量法测定铬酸钡含量间接换算碳酸钡含量,建立了重量法测定毒重石中碳酸钡的方法,测得毒重石中碳酸钡含量相对标准偏差RSD均小于1%,加标回收率98.3%~103%,满足日常分析要求。In order to eliminate the influence of a small amount of impurities such as calcium carbonate,insoluble silicate and barium sulfate on the analysis results of barium carbonate,hydrochloric acid is used to digest the sample and slow filtration is used to eliminate the interference of barium sulfate and silicate.In the alkaline environment with pH=4.5,the filtrate reacts with potassium dichromate solution to form barium chromate precipitation and filtration is used to eliminate the interference of calcium ion.The content of barium chromate is determined by gravimetric method Indirect conversion of barium carbonate content.The RSD of barium carbonate in witherite is less than 1%and the recovery of standard addition is99.3%—103%,which meets the requirements of daily analysis.

关 键 词：毒重石 重量法 碳酸钡 重铬酸钡 干扰消除 

分 类 号：O655.1[理学—分析化学]