偶氮氯膦—PN 增量—全差示分光光度法测定岩矿中微量钇

Differential Spectrophotometric Determination of Trace Quantity of Yttrium with a New Chromogenic Reagent Chlorophsphonazo—PN

本文研究了 CPA—PN 与钇有色络合物的显色条件,在25ml 体积内,加入513molHCl 0.4—0.8ml,0.05%CPA—PN 1～4ml,2.0ml 2%PVA,在730 nm 波长处,用721分光光度计测量吸光度,在7～20mgY_2O_3/25ml 范围内,吸光度与浓度呈线性关系,但非钇稀土元素有共显色效应现象,采用7215全差示分光光度计测定,在10～28μgY_2O_3/25ml 范围内,浓度与吸光度呈线性关系,虽然线性范围扩大了,但是,非钇稀土元素的共显色效应现象尚未消除,本文采用增量——全差示分光光度法测定成份比较复杂的岩矿中微量钇,则不必分离,非钇稀土元素的共显色效应现象基本消除,与 ICP 法测定结果相比较,相对标准偏差1%。

A new colour reaction of yttrium with chlorophosphonazo-PN is investi- gated in this paper.By ordinary operation of spectrophometry Beer's law is obeyed in the range of 7—20 μgY_2O_3/25 ml but non-Yttrium rare earths give interference.By differential spectrophtometrie method and incremental method,the linear range is extended to 10—28g Y_2O_3/25 ml and Co-colour reaction effect of non-Yttrium rare earths is eliminated.