乙醇-氯化亚铜-氯化铵-盐酸复合溶剂分离-EDTA返滴定法测定铝电解质中单质铝

来源期刊：冶金分析2011年第3期

论文作者：蒲秋梅 任凤莲 曹福悦

文章页码：23 - 27

关键词：单质铝； 铝电解质； 分离测定； 选择性溶剂

Key words：aluminum； aluminum electrolyte； separation and determination； selective solvent

摘    要：新型低温铝电解质体系物相组成复杂,单质铝的分离测定尤为困难。本文采用高选择性复合溶剂乙醇-氯化亚铜-氯化铵-盐酸(ECAH)直接分离后测定铝电解质中单质铝,成功解决了单质铝与其它铝的化合物分离困难的问题,有效降低了铝电解质溶样时铝的氟化物的微溶效应带来的误差,为铝电解质中单质铝的物相分析提供了可靠的研究方案。采用经典ED-TA络合返滴定法测得铝电解质样品中单质铝含量,加标回收率在97%~103%之间,RSD(n=6)为1.1%和1.5%。测定结果和Al-CAS-OP-CPC四元络合光度法测定结果进行比对,结果一致。

Abstract: It was particularly difficult to separate and determine aluminum in new low-temperature aluminum electrolyte system because of its complicated components.In this paper,aluminum in aluminum electrolyte was directly separated and determined using high-selectivity ethanol-cuprous chloride-ammonium chloride-hydrochloric acid (ECAH) as complex solvent.This method successfully settled the problem of difficult separation of aluminum from aluminum compounds,effectively reduced the determination error introduced by slight soluble effect of fluoride of aluminum during the dissolution of aluminum electrolyte,and provided a reliable research method for the phase analysis of aluminum in aluminum electrolyte.Aluminum in aluminum electrolyte samples was determined by classic EDTA complexing back titration method.The standard addition recoveries were 97%-103%,and the relative standard deviations(RSD,n=6) were 1.1% and 1.5%,respectively.The determination results were in good agreement with those obtained by Al-CAS-OP-CPC quaternary complex photometry.