【摘要】 在阳离子表面活性剂溴化十六烷基三甲胺（ＣＴＭＡＢ）存在下，于ｐＨ８．０～９．０的Ｈ３ＢＯ３－ＮａＯＨ缓冲介质中，铋（Ⅲ）与新显色剂５′－硝基水杨基荧光酮（５′－ＮＳＦ）反应生成组成比为１∶３的水溶性和稳定性皆佳的红色配合物，其吸收峰波长为５４４ｎｍ，表观摩尔吸光系数为１．４６×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，线性范围为０～７．０μｇ／１０ｍＬ。采用巯基棉分离，能够消除许多金属离子的干扰。用于焊锡和铸造锡合金中微量铋的测定，相对误差为３．０％，相对标准偏差不大于０．９０％（ｎ＝６），回收率为９５．７～９９．３％。更多还原

【Abstract】 A new spectrophotometric method for the determination of bismuth (Ⅲ) is proposed in the paper with 5′ nitrosalicylfluorone(5′ NSF), i.e ,2,6,7 trihydroxy 9 (2′ hydroxy 5′ nitro)phenylfluorone 3 and cetyltrimethyl ammonium bromide (CTMAB) .In a HBO 3 NaOH buffer medium of pH 8.0～9.0,the complex is formed with its maximum absorption at 544nm and an apparent molar absorptivity of 1.46×10 5L·mol -1 ·cm -1 .The molar ratio of Bi(Ⅲ) to 5’ NSF in the complex was found to be 1∶3 .Beer’s law is obeyed for bismuth in the concentration range of 0～7 0μg/10mL.THe effect of other metal ions has also been investigated.The method has been satisfactorily applied to the determination of micro amounts of bismuth in a tin alloy and a soldering tin after the interfering ions have been separated with sulfhydryl fiber cotton.更多还原