DEVELOPMENT OF THE H-POINT STANDARD ADDITIONS METHOD FOR ANALYTE DETERMINATIONS IN UNKNOWN MATRIX - LOCATION OF LINEAR MATRIX SPECTRAL INTERVAL

被引:22
作者
BOSCHREIG, F [1 ]
CAMPINSFALCO, P [1 ]
VERDUANDRES, J [1 ]
机构
[1] UNIV VALENCIA, FAC QUIM, DEPT QUIM ANALIT, C DR MOLINER 50, E-46100 BURJASSOT, SPAIN
关键词
LINEAR MATRIX SPECTRAL INTERVAL; H-POINT STANDARD ADDITIONS METHOD;
D O I
10.1016/0003-2670(93)85297-W
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The development of the H-point standard additions method is proposed in order to obtain the unbiased analyte concentration when the matrix of the sample is completely unknown. A spectral region where the interferent behaviour can be considered linear at three wavelengths must be chosen. The method uses the analytical signal data at these three wavelengths, usually situated in the maxima region of the analyte. Two procedures are proposed in order to know and to locate this behaviour for the unknown interferent. Several binary and ternary mixtures of phenol, 4-chlorophenol and 4-chloro-3-methylphenol as representative examples have been assayed, with accurate (less than 3% relative error) and precise (less than 3% R.S.F). for n = 6) results for the analyte concentration, obtaining for the binary mixtures also the interferent one.
引用
收藏
页码:831 / 844
页数:14
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