Journal
ANALYTICA CHIMICA ACTA
Volume 487, Issue 2, Pages 181-188Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0003-2670(03)00556-7
Keywords
partial least squares; copper; nickel; cobalt; zinc; spectrophotometric determination
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The partial least squares (PLS) applied to the simultaneous determination of the divalent ions of copper, nickel, cobalt and zinc based on the formation of their complexes with 2-carboxy-2'-hydroxy-5'-sulfoformazyI benzene (zincon). The absorption spectra were recorded from 515 through 750 run. The effect of pH on sensitivity and the selectivity was studied in the range 3.0-10.0 and the pH 8.0 was choused according to net analyte signal (NAS) as a function of pH. The concentration range for Cu2+, Ni2+, Co2+ and Zn2+ in solution calibration sets were 0-2.6, 0-4.6, 0-3.0 and 0-4.92 ppm, respectively. The root mean squares differences (RMSD) for copper, nickel, cobalt and zinc were 0.0181, 0.0488, 0.0309 and 0.0463, respectively. (C) 2003 Published by Elsevier Science B.V.
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