连续测定天青石中的钡和锶  

Successive Determination of Barium and Strontium in Celestine

作　　者：刘良书 陈菊英 伍乾富 陈季娴 Liu Liangshu;Chen Juying;Wu Qianfu;Chen Jixian

机构地区：[1]地矿部南方煤炭测试中心

出　　处：《岩矿测试》1987年第4期283-286,I0008,共5页Rock and Mineral Analysis

摘　　要：重量法和容量法测定天青石中的锶,通常是测定钡和锶的总量,差减由铬酸钡容量法测得的钡量而求得。其共同缺点是操作冗长,两项测定的误差均集中在锶的结果上。B.C.Sinha等曾提出先后置换沉淀硫酸钡和硫酸锶的连续测定钡和锶的方法,据称在钡高锶低的试液中得到满意的回收。There is a large difference in the solubility products of barium chromate and strontium chromate.An excess of ZnCl_(2)-(NH_(4))_(2)C_(l)O_(4) solution was added to displace Ba from an alkaline earth-EDTA homogeneous solution,with the formation of BaCrO_(4) precipitate and Zn-EDTA complex,the excess Zn was titrated with EDTA to obtain the Ba content.An excess of MgSO_(4) solution was added to the titrated solution to form SrSO4 precipitate,the excess Mg in the filtrate was titrated to obtain the Sr content.The method is simple and rapid and has been applied to the determination of Ba and Sr in celestine with satisfactory results.

关 键 词：连续测定 沉淀硫酸钡 容量法测定 天青石 重量法 硫酸锶 铬酸钡容量法 

分 类 号：O65[理学—分析化学]