多波长线性回归法同时光度测定镍钴锌
SIMULTANEOUS-SPECTROPHOTOMETRIC DETERMINATION OF Ni,Co AND Zn BY AKC MATRIX ANALYSIS
摘 要
在乙醇存在下,镍、钴、锌在pH 6.6六胺缓冲溶液中可与显色剂2-(6-甲基-2-苯并噻唑偶氮)-5-二乙氨基苯甲酸(MBTAEB)形成稳定的配合物,其表观摩尔吸光系数分别为：εNi646 nm=149×105L·mol-1·cm-1；εCo650 nm=1.32×105L·mol-1·cm-1；εZn630 nm=7.7×104L·mol-1·cm-1.但三种络合物的吸收光谱重叠相互干扰,应用多波长线性回归法,可在三离子共存下单独测定.方法简单、快速、灵敏度高,可不经分离同时测定三种离子的含量.
矩阵法
镍
钴
锌
Spectrophotometry
Matrix analysis
Nickel(Ⅱ)
Cobalt(Ⅱ)
Zin(Ⅱ)
Abstract
In the study of the color reactions of Ni(Ⅱ),Co(Ⅱ) and Zn(Ⅱ) with the color reagent 2-(6-methyl-2-benzothiazolylazo)-5-diethylaminobenzoic acid (abbreviated as MBTAEB) in hexamine buffer of pH 6.6 and in the presence of ethanol separately,highly sensitive reactions were observed giving molar absorptivities of εNi646=1.49×105L·mol-1·cm-1,εCo650=1.32×105L·mol-1·cm-1 and εZn630=7.7×104L·mol-1·cm-1,respectively.But the absorption spectra were seriously overlapped making the direct determinations impossible.The problem of spectral-overlapping was solved by the application of AKC matrix analysis,a simple,rapid and selective method for the simultaneous determination of Nickel(Ⅱ) Cobalt(Ⅱ) and Zn(Ⅱ) ions in a same solution without the necessity of separation was made possible.
中图分类号 O652.7
所属栏目 工作简报
基金项目 安徽省教育厅自然科学研究计划项目(2006KJ131B)
收稿日期 2005/1/12
修改稿日期
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备注鲍霞(1969-),女,安徽寿县人,副教授,主要从事有机染料合成及其应用研究.
引用该论文: BAO Xia,ZHANG Xiao-ling,JIA Hong-ying,LI Chun-ying. SIMULTANEOUS-SPECTROPHOTOMETRIC DETERMINATION OF Ni,Co AND Zn BY AKC MATRIX ANALYSIS[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2006, 42(6): 440～442
鲍霞,张小玲,贾宏瑛,李春迎. 多波长线性回归法同时光度测定镍钴锌[J]. 理化检验－化学分册, 2006, 42(6): 440～442
被引情况:
【1】斯琴高娃,王立华,王宁,陈梦琪,陈葛, "铬黑T分光光度法测定饮料中痕量镍",理化检验－化学分册 49, 735-737(2013)
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参考文献
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【4】Sakai T,Nakayama M,Katami T,et al.Extraction-Spectrophotometric Determination of Trace Iron(Ⅱ) in Sea Water with 2-[2-(3,5-Dibromo Pyridyl)azo]-5-Diethylaminobenzoic Acid[J].Mikrochim Acta,1989,98(1):31.
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