EGTA滴定法测定硅钙钡合金中的钙、钡  

Determination of Ca and Ba in Si-Ca-Ba Alloy with EGTA Titrimetric Method

作　　者：董丙成 DONG Bingcheng(Technology Centre of Laiwu Branch of Shandong Iron and Steel Co.,Ltd.,Jinan 271100,China)

机构地区：[1]山钢股份莱芜分公司技术中心测试中心,山东济南271100

出　　处：《山东冶金》2020年第5期35-37,共3页Shandong Metallurgy

摘　　要：试样以硝酸一氢氟酸溶解,高氯酸冒烟除尽硅和氟,用稀盐酸溶解盐类后制取母液。分取母液两份,分别以三乙醇胺半胱氨酸联合掩蔽铁等干扰元素,以氢氧化钾调节pH≥13后,第一份以钙黄绿素为指示剂,用EGTA标准落液滴定钙钡合量,另一份以硫酸钾沉淀钡后,用EGTA标准溶液滴定钙量,用差减法计算钡的百分含量。测定结果显示,钙相对标准偏差<0.31%,钡相对标准偏差<0.37%。The sample was dissolved with nitrate acid and hydrofluoric acid,accedes to perchloric acid and heated until emitting thick fume,the silicon and fluoride was removed.The remaining liquid which contains rich salts was dissolved with dilute hydrochloric acid,was prepared the mother solution for analysis.Two parts was taken from mother solution,after masking the interferences such as Fe through combining triethanolamine and cysteine and the solution was regulated to ph≥13 by KOH respectively.The first part was used to determine the total content of Ca and Ba with EGTA standard solution titrimetric method with calcein as indicator,another part was used to determine the content of Ca with EGTA standard solution titrimetric method after the Ba was precipitated by potassium sulfate.The content of Ba was calculated with subtraction method.The test results show that the deviation of Ca is less than 0.31%,and the deviation of Ba is less than 0.37%.

关 键 词：硅钙钡合金 EGTA滴定法 钡 钙 

分 类 号：TG115.31[金属学及工艺—物理冶金]