Quantitative approximation for the selectivity of analytical spectrophotometric procedures with systems which do not obey Beer's law

A selectivity index is proposed for defining the selectivity of a spectrophotometric procedure that is subject to interference by species which do not obey Beer's law in the system. The interactions between analyte and interferents which affect the absorbance of an analytical system are studied...

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Bibliographic Details
Published in:Talanta (Oxford) 1989-09, Vol.36 (9), p.909-917
Main Authors: Martinez, V.Peris, Adelantado, J.V.Gimeno, Garcia, A.Pastor, Reig, F.Bosch
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
Online Access:Get full text
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Summary:A selectivity index is proposed for defining the selectivity of a spectrophotometric procedure that is subject to interference by species which do not obey Beer's law in the system. The interactions between analyte and interferents which affect the absorbance of an analytical system are studied by means of a simple mathematical model. Theoretical expressions are derived which represent the selectivity as a function of the analyte or interfering species concentration. The treatment is illustrated by a study of the Zr(IV)-chloranilic acid system in presence of thorium as interferent.
ISSN:0039-9140
1873-3573
DOI:10.1016/0039-9140(89)80029-3