摘要
在ＨＡｃ－ＮＨ４Ａｃ缓冲介质中，乳化剂ＯＰ存在下，铝与ＣＡＳ形成灵敏度很高的绿色络合物，测定波长位于６２０ｎｍ，ε６２０＝１．０９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。碳酸镍中除Ｆｅ３＋对测定有干扰外，其它的杂质元素均不干扰，方法具有较好的选择性。Ｆｅ３＋的干扰，可采用抗坏血酸还原Ｆｅ３＋成Ｆｅ２＋而消除。５ｍｇ以下Ｎｉ对测定无明显影响，但当Ｎｉ量大于此量时，络合物吸光度下降，产生负干扰，本法采用在６－８ｍｏｌ／Ｌ的盐酸介质中，用乙酸乙酯－苯甲酸萃取微量铝使之与基体镍分离的方法消除镍的干扰。对碳酸镍中微量铝测定经与ＩＣＰ－ＡＥＳ法对照，结果良好。
The presence of surfactant p octye polyethylene glycol phenyl(OP),aluminium forms sensitive colored complex with chrome azurol S(CAS).The maximum absorption wavelength is 620nm and its appearance molar absorptivity is 1.09×10 5L·mol -1 ·cm -1 ,following beer's law at range 1-8μg/mL . Nickel and iron are main interfering elements.Interference of iron can be eliminated by adding ascorbic acid.Aluminium could be separated from nickel matrix by extraction of ethyl acetate benzoic acid.The remains of nickel didn't interfere the determination of aluminium.The experimental results show that this method has been applied satisfactorily to the determination of trace amount of aluminium in nickel carbonate.
出处
《光谱实验室》
CAS
CSCD
1999年第1期54-56,共3页
Chinese Journal of Spectroscopy Laboratory
关键词
铝
分光光度法
铬天青S
OP
碳酸镍
测定
Aluminium,Spectrophotometry,CAS,OP,Nickel Carbonate,Extraction.
