新显色剂二溴对甲基偶氮甲磺光度法测定钡的研究和应用

Study on The Spctrophotometric Determi-nation of Barium with a New ChromogenicReagent Dibromo-p-Methy1-Methylsulfonazoand Its Analytical Applicatlon

研究了新显色剂二溴对甲基偶氮甲磺光度测定微量钡的方法。在０．２４ｍｏｌ·Ｌ￣（－１）Ｈ＿（３）ＰＯ＿４介质中试剂与钡形成蓝色配合物，在６３２ｎｍ处具有最大吸光度，摩尔吸光系数为７．１３×１０￣４Ｌ·ｍｏｌ￣（－１）·Ｃｍ￣（－１）。钡量在０－２５μｇ／２５ｍＬ内符合比耳定律。方法应用于钛酸钡烧结构中微量钡的测定。

spectrophotometric method for the de-termination of barium with a new chromogenicreagent dibromo-p-methyl-methylsulfonazohas been estabhshed. In 0. 24 mol·L￣(-1)H_(3)PO_(4) medium,barium reacts with the reagentto form a blue complex which has an absorpionmaximum at 632 nm with a molar absorptivityof 7, 31× 10￣4 L·mol￣(-1).cm￣(-1).Beer’s Iaw isobeyed for 0～25μg of barium is 25mL of solu-tion.The method has been applied to the de-termination of micro amounts of barium in sin-tered materials of barium titanate with satis-factory results.