Simultaneous determination of copper, nickel, cobalt and zinc using ZINCON (cas 135-52-4) as a metallochromic indicator with partial least squares

Add time:09/30/2019    Source:infona.pl

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'-sulfoformazyl benzene (ZINCON (cas 135-52-4)). The absorption spectra were recorded from 515 through 750nm. 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 Cu 2 + , Ni 2 + , Co 2 + and Zn 2 + in solution calibration sets were 0-2.6, 0-4.6, 0-3.0 and 0-4.92ppm, respectively. The root mean squares differences (RMSD) for copper, nickel, cobalt and zinc were 0.0181, 0.0488, 0.0309 and 0.0463, respectively.

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