6533b835fe1ef96bd129e99b

RESEARCH PRODUCT

Flow-Injection Solid Phase Partial Least-Squares Spectrophotometric Simultaneous Determination of Iron, Nickel and Zinc

Antonio Celso Spinola CostaSalvador GarriguesLeonardo S. G. TeixeiraLeonardo S. G. TeixeiraMiguel De La Guardia

subject

Flow injection analysisAnalytemedicine.diagnostic_testAnalytical chemistrychemistry.chemical_elementGeneral ChemistryZincAbsorbanceNickelchemistrySpectrophotometryPartial least squares regressionmedicineTernary operation

description

A PLS-2 multivariate calibration method has been developed for the simultaneous determination of iron, nickel and zinc in ternary mixtures by solid phase spectrophotometry associated with flow injection analysis. Fe(II), Ni(II) and Zn(II) form color complexes with 1-(2-thiazolylazo)-2-naphthol (TAN), immobilized on a C18 bonded silica support, at pH 6.4. The proposed procedure is based on the different reaction/retention ratios of the studied ions on the solid support. Bilinear spectrophotometric data of the analytes, fixed in the solid support, were recorded in the 400-800 nm wavelength range as a function of time and a partial least squares (PLS-2) algorithm was used to predict results of synthetic samples. The calibration set employed was integrated by 8 ternary mixture standards and a blank solution. Mixtures containing 0.040 to 0.20 mg L-1, of each species, were successfully resolved, using 3 factors for each analyte and a restricted number of absorbance data obtained in the wavelength range from 560 to 650 nm.

yearjournalcountryeditionlanguage
2002-02-01Journal of the Brazilian Chemical Society
https://doi.org/10.1590/s0103-50532002000100008