摘要
本文较系统地研究了新显色剂２－（４－氯－２－膦酸基苯偶氮）－７－（３－碘苯偶氮）－１，８－二羟基－３，６－萘二磺酸（间碘偶氮氯膦）与铋的显色反应分光光度法测定铋。在硝酸和磷酸的混酸介质中，间碘偶氮氯膦与铋形成２：１的深色配合物：最大吸收波长在６８０ｎｍ，摩尔吸光系数为１．４８×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），该方法操作简便，灵敏度高，Ｂｉ（Ⅲ）在０～１８μｇ／２５ｍＬ范围内符合比尔定律，用拟定的方法测定了可锻铸铁中的微量铋，结果令人满意。
simple and sensitive spectropho-tometric method to determine Bi(Ⅲ)hasbeen developed.In a mixture medium of ni-tric acid and phosphoric acid ,bismuth reactswith chlorophosphonazo-ml to form a stablecomplex. The composition of complex is 1 :2(M : L).The wavelength of maximum ab-sorbance of Bi( Ⅲ)-chlorophosphonazo-mI is680 nm,and its apparent molar absorptivityis 1.48×10￣5 L·mol￣(-1)·cm￣(-1). Beer's law isobeyed in the range of 0～18μg/25 mL.Themethod was applied to the determination ofBi in iron sample with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
1995年第2期37-39,共3页
Chinese Journal of Analysis Laboratory
关键词
间碘偶氮氯膦
铋
分光光度法
铸铁
chloro-2-phosphophen-ylazo)-7-(3-iodophenylazo )-1,8-dihydroxy-3,6-naphthalene sulfuric acid(chlorophos-phonazo-mI )
bismuth determination
spec-trophotometry
