水扬酰异羟肟酸测定微量钼的分光光度法的研究

SPECTROPHOTOMERY DETERMINATION OF THE YELLOW COMPLEX FROM REACTION OF SALICYLHYDROAMIC ACID AND Mo(Ⅵ)

本文报导了水扬酰异羟肟酸Ｓａｌｉｃｙｈｙｄｒｏｘａｍｉｃａｃｉｄ（ＳＨＡ）测定微量钼的研究结果。实验说明，在ｐＨ６．７～８，ＳＨＡ与Ｍｏ（Ⅵ）形成黄色络合物有稳定吸收。当Ｍｏ（Ⅵ）在０．４～２．８ｐｐｍ时服从Ｂｅｅｒ定律，最大吸收波长为３６０ｎｍ，摩尔吸光系数为ε３６０＝１．９×１０３Ｌ／ｍｏｌ·ｃｍ，我们对试剂浓度、酸度、工作曲线、干扰离子等进行了研究，与经典测钼的方法对比误差不大于１％，显色剂ＳＨＡ系自制，经熔点，元素分析及红外光谱分析与文献报导一致，该显色剂制备方法简便，易纯化、产率高。

This paper reports a yellow complex from reaction of salicylhydroxamic acid and Mo(Ⅵ) ,That at pH 6.7～8.0 obeys the Beer's law whthin the range of 0.4～2.8 ppm,and has the maximum absorption wavelenyth of 360 nm.The effects of reagent concentration acidity and interfering ions are discussed.