ONLINE COATED COLUMNS FOR THE SPECTROPHOTOMETRIC DETERMINATION OF METALS BY CONTINUOUS-FLOW ANALYSIS

被引:20
作者
ZOLOTOV, YA [1 ]
MAKSIMOVA, IM [1 ]
MOROSANOVA, EI [1 ]
VELIKORODNY, AA [1 ]
机构
[1] MOSCOW MV LOMONOSOV STATE UNIV,DEPT CHEM,DIV ANALYT CHEM,MOSCOW 119899,RUSSIA
关键词
SPECTROPHOTOMETRY; FLOW ANALYSIS; COATED CAPILLARY TUBES; METALS;
D O I
10.1016/0003-2670(94)00480-A
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The immobilization of xylenol orange, 1-(2'-pyridylazo)-2-naphthol and (p-sulfophenylazo)-2'-sulfo-4'-nitrodiazoaminobenzene disodium salt (Cadion) on reversed-phase silica (C-16, C-8, phenyl, C-1, C=N) and capillary tubes with a hydrophobic inner surface (C-6, C-phenyl, C-1) in the flow were studied. The flow system including a microcolumn or a capillary tube for the determination of metal ions is suggested. Its versatility and flexibility is provided by on-line coating of the sorbents or inner surface of the capillary tubes. The procedures for the flow spectrophotometric determination of Cd, Co, Cu and Fe(III) in the range 8 X 10(-8)-3 X 10(-5) M with on-line preconcentration are suggested. The preconcentration factors are up to 9 for the microcolumns and up to 19 for the capillary tubes. The throughput of the system is 19 samples per hour. The method of simultaneous determination of two metals in the mixture (Cu(II) and Co(II), Co(II) and Fe(III), Fe(III) and Zn, Mn(II) and Pb(II)) in the range 1 X 10(-6)-7 X 10(-5) M at 30-60 samples per hour is developed.
引用
收藏
页码:378 / 385
页数:8
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