DETERMINATION OF ARSENIC, CHROMIUM, SELENIUM AND VANADIUM IN BIOLOGICAL SAMPLES BY INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY USING ONLINE ELIMINATION OF INTERFERENCE AND PRECONCENTRATION BY FLOW-INJECTION

被引:38
作者
EBDON, L
FISHER, AS
WORSFOLD, PJ
机构
[1] Plymouth Analytical Chemistry Research Unit, Department of Environmental Sciences, University of Plymouth, Plymouth, Devon PL4 8AA, Drake Circus
关键词
INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; FLOW INJECTION MATRIX REMOVAL; PRECONCENTRATION; ACTIVATED ALUMINA; BIOLOGICAL MATRICES;
D O I
10.1039/ja9940900611
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A method of matrix elimination has been developed that facilitates the determination of analytes such as arsenic, chromium, selenium and vanadium in biological matrices by inductively coupled plasma mass spectrometry (ICP-MS) without interference from polyatomic ions. The method involves the retention of the analytes as anions on activated alumina (acidic form) in a microcolumn using an on-line flow injection system, with simultaneous matrix removal. Analysis of certified reference materials [NIES (National Institute of Environmental Studies) 9 Sargasso, Tort-1 Lobster Hepatopancreas, Dorm-1 Dogfish Reference Muscle and Dolt-1 Dogfish Liver Tissue] yielded results in good agreement with the certified values, although a photolysis step was used for determinations of arsenic in animal based samples in order to destroy organoarsenic compounds. Tests showed close to 100% recovery for all analytes. The limits of detection (3sigma(n-1)) using a 200 mul sample loop were 1.2, 6.0, 9.0 and 65 ng ml-1 for vanadium, chromium, arsenic and selenium, respectively. A preconcentration system was developed for selenium because of the relative insensitivity of ICP-MS to this element. This yielded a detection limit of 1.0 ng ml-1 at m/z 78.
引用
收藏
页码:611 / 614
页数:4
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