DBF-偶氮氯膦分光光度法测定锡合金中的微量铋  

PHOTOMETRIC DETERMINATION OF MICRO BISMUTH IN TIN ALLOY WITH DBF-CPA

作　　者：高琳[1] 宋红[2] 王彩红[2] 姚军龙[3] 

机构地区：[1]江汉大学化学与环境工程学院,武汉430056 [2]武汉生物工程学院,武汉430415 [3]湖北省机电研究设计院,武汉430070

出　　处：《化学分析计量》2005年第3期57-58,共2页Chemical Analysis And Meterage

摘　　要：在0.36mol/L硫酸-0.60mol/L磷酸介质中,铋与DBF偶氮氯膦形成配位比为1∶3的蓝色配合物,最大吸收波长为638nm,表观摩尔吸光系数为9.4×104L/(mol·cm),铋含量在0～1.2μg/mL内符合比耳定律,显色反应具有良好的选择性。用该方法测定锡标准样品中铋的含量,测定值与标准值基本一致,测定结果的相对标准偏差为2.3%～5.5%。The chromogenic reaction between the reagent DBF-CPA and bismuth(Ⅲ) was studied. In a mixed acid medium of 0.36 mol/L H_ 2SO_ 4-0.60 mol/L H_ 3PO_ 4, bismuth(Ⅲ) reacted with the reagent to form the blue complex which had composition of 1∶3 and exhibited the absorption maximum at 638 nm with a molar absorptivity of 9.4×10 4 L/(mol·cm), and the reaction had good selectivity. Beer′s law was obeyed for 0~1.2 μg/L bismuth solution. The proposed method was applied to the determination of bismuth in Sn standard samples and the determined value was consistent with standard value, RSD was 2.3%~5.5%.

关 键 词：DBF-偶氮氯膦 分光光度法测定 锡合金 表观摩尔吸光系数 微量 最大吸收波长 相对标准偏差 磷酸介质 比耳定律 显色反应 标准样品 测定结果 配合物 配位比 铋含量 标准值 测定值 硫酸 

分 类 号：TQ460.72[医药卫生—药物分析学] S816.17[化学工程—制药化工]