DETERMINATION OF SELENIUM IN SEA-WATER BY ADSORPTIVE CATHODIC STRIPPING VOLTAMMETRY

被引：104
作者：
VAN DEN BERG, CMG
KHAN, SH
机构：
[1] Oceanography Laboratories, Department of Earth Sciences, University of Liverpool, Liverpool, L69 3BX
来源：
ANALYTICA CHIMICA ACTA | 1990年 / 231卷 / 02期
关键词：
D O I：
10.1016/S0003-2670(00)86420-X
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A procedure is presented for determining Se(IV) and total dissolved Se in sea water using cathodic stripping voltammetry in the presence of added copper. Experiments using cyclic voltammetry indicate that the preconcentration step consists in adsorption of a Cu(I)2Se complex species on the hanging mercury drop electrode. The optimized analytical conditions include a copper concentration of 40 μM and a solution pH of 1.6. Differential pulse modulation is used. Interference caused by organic surface-active substances present in natural waters in eliminated by UV photolysis of the sample. Cadmium interferes with the determination of Se only when present at a concentration 100 times higher than normal. UV photolysis at pH ≈ 8 is used to convert Se(VI), which is the electroactive species. The response is linear for Se concentrations between 0 and 200 nM. The limit of detection is 0.01 nM Se when a deposition time of 15 min is used. © 1990.
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页码：221 / 229
页数：9
相关论文
共 23 条
[1]   CRITICAL-EVALUATION OF SOME WET DIGESTION METHODS FOR THE STRIPPING VOLTAMMETRIC DETERMINATION OF SELENIUM IN BIOLOGICAL-MATERIALS [J].
ADELOJU, SB ;
BOND, AM ;
BRIGGS, MH .
ANALYTICAL CHEMISTRY, 1984, 56 (13) :2397-2401
[2]   DETERMINATION OF DISSOLVED INORGANIC SELENIUM(IV) AND SELENIUM(VI) SPECIES IN NATURAL-WATERS BY HYDRIDE GENERATION ATOMIC-ABSORPTION SPECTROMETRY [J].
APTE, SC ;
HOWARD, AG .
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 1986, 1 (05) :379-382
[3]   PARAMETER EVALUATION FOR THE DETERMINATION OF SELENIUM BY CATHODIC STRIPPING VOLTAMMETRY AT THE HANGING MERCURY DROP ELECTRODE [J].
BALTENSPERGER, U ;
HERTZ, J .
ANALYTICA CHIMICA ACTA, 1985, 172 (JUN) :49-56
[4]   DIFFERENTIAL-PULSE POLAROGRAPHIC-DETERMINATION OF SELENIUM SPECIES IN CONTAMINATED WATERS [J].
BATLEY, GE .
ANALYTICA CHIMICA ACTA, 1986, 187 :109-116
[5]  
Bruland K.W., 1983, CHEM OCEANOGR, P157, DOI DOI 10.1016/B978-0-12-588608-6.50009-2
[6]   POLAROGRAPHY OF SELENIUM (IV) [J].
CHRISTIAN, GD ;
PURDY, WC ;
KNOBLOCK, EC .
ANALYTICAL CHEMISTRY, 1963, 35 (09) :1128-&
[7]   SULFIDE COMPLEXATION IN SURFACE SEAWATER [J].
DYRSSEN, D .
MARINE CHEMISTRY, 1988, 24 (02) :143-153
[8]  
HENZE G, 1969, FRESEN Z ANAL CHEM, V295, P1
[9]  
HEYROVSKY J, 1966, PRINCIPLES POLAROGRA, P21
[10]   DETERMINATION OF SELENIUM(IV) BY DIFFERENTIAL PULSE POLAROGRAPHY OF 4-CHLORO-ORTHO-PHENYLENEDIAMINE PIAZSELENOL [J].
HOWARD, AG ;
GRAY, MR ;
WATERS, AJ ;
OROMIEHIE, AR .
ANALYTICA CHIMICA ACTA, 1980, 118 (01) :87-91
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