摘要
在聚乙烯醇（ＰＶＡ）存在下，耐尔蓝（ＮＢ）与抗钼杂多酸络阴离子形成离子缔合物，其最大吸收位于５８５ｎｍ，表现摩尔吸光系数ε＝３．５９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，服从比尔定律范围０～２μｇＳｃ／２５ｍｌ，测定极限３，０ｎｇＳｃ／ｍｌ（ｎ＝７），对于０．０４μｇＳｃ／ｍｌ测定的相对标准偏差ＲＳＤ＝２．８％（ｎ＝１０）。离子缔合物的摩尔组成为Ｓｃ：Ｍｏ：ＮＢ＝１：１２：３。本法已用于地质样品中钪的测定，结果满意。
A spectrophotometric method for the determination of scandium has been reported. The method is based on that the heteropoly molybdoscandic acid forms ion-association complex with nile blue (NB) in the presence of polyvinyl alcohol (PVA). The absorption maxinum is at 585nm. The apparent molar absorption coefficient of this ion-association complex is 3.59×105 L· mol -1. Beer's law is obeyed in the range of 0 to 2.0μg/25ml for scandium. The detection limit is 3.0μg/ml (n=7). The relative standard deviation for 0.04μg/ml scandiurn is 2.8%(n= 10). The molar composition of this ion-association complex is found to be Sc:Mo:NB = 1:12:3. The method is applied to the determination of scandium in some geological samples with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1996年第1期14-17,共4页
Metallurgical Analysis
基金
云南省应用基础研究基金
