【摘要】 研究了偶氮羧Ⅰ与钒（Ⅳ）的显色反应及其应用．在ｐＨ５０～６５的醋酸醋酸钠缓冲溶液中，钒（Ⅳ）与偶氮羧Ⅰ形成红色的１∶１型配合物．该配合物的最大吸收波长为５８２ｎｍ，钒的浓度在０～３０μｇ／２５ｍｌ范围符合比尔定律，回归方程为Ａ＝００１０４４Ｃ０００４２７３，相关系数为ｒ＝０９９９８，表观摩尔吸光系数为１２８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１．该方法简单、快速，有良好的重现性和选择性，可用于钢中钒的测定更多还原

【Abstract】 he color reaction of carboxyazo Ⅰ with vanadium(Ⅳ) and its applications have been studied. The complex of vanadium(Ⅳ) with carboxyazo Ⅰ has maximum absorption at 582nm in pH 5 0～6 5 acetato buffer solution. The complex composition is 1∶1. A molar absorptivity of ε=1 28×10 4L·mol -1 ·cm -1 has been obtained. The system obeys Beers law for 0～30 μg/25[KG*8]ml of vanadium. The regression equation is A =0 01044C0 004273 and the regression coefficient is 0 9998. The method has good selectivity and so can be applied to the direct spectrophotometric determination of vanadium in steel allays. 更多还原