以新显色剂DBC—偶氮肿光度法测定微量铋的研究

以新显色剂DBC—偶氮肿光度法测定微量铋的研究 A STUDY ON SPECTROPHOTOMETRIC DETERMINATION OF TRACE BISMUTH BY NEW REAGENT DBC-ARSENAZO 杨代菱 first-author 王宏伟 余席茂 研究了新显色剂DBC—偶氮胂与铋的显色反应。该试剂及其与铋的络合物的最大吸收波长分别为528nm及632nm,络合物的表观摩尔吸光系数为9.0×10 4 升·摩尔 -1 ·厘米 -1 。在1.2N高氯酸介质中,大量的常见离子均不干扰铋的测定。若使用加入过量溴离子的褪色溶液作为参比,可以不经分离直接测定纯铜,铜合金及人发中的痕量铋,方法快速、简便、准确。七次测定的变动系数为2.4%。 The colour reaction of new reagent DBC-arsenazo with bismuth have been studied It was found to have high sensitivity(ε=9.0×10 4 L·mol -1 ·cm -1 ) and good selectivity. Both the reagent and complex are stable and their adsorption maxima are 528nm and 632nm respectively. A large amount of cations and anions don’t interfere with the determination in 1.2 N HClO 4 medium. It has been applied to determine the trace of bismuth directly in copper alloy, pure copper and human hair, by adding excessive Br-to coloured solution as a reference solution The mothod is rapid, simple and exact The variation coefficient was 2.4%. 1986-03-01 2021-04-01 3