The determination of trace amount of Gallium and Nickel is very important in metallurgy and environmental analytical chemistry [1,2], and there is a growing need for procedures with high sensitivity and selectivity, because increasing interest and importance of these metals in different fields [3,4]. Several spectrophotometric determination methods have been used for resolving mixtures of compounds with overlapping spectra, without prior separation steps, such as partial least squares (PLS) [5], and mean centering of ratio spectra (MC) [6]. To the best of our knowledge there is no report on the simultaneous determination of Ga and Ni. In this work Gallium and Nickel were determined simultaneously in metal- Zincon-Triton X-100 systems by use of partial least squares and mean centering of ratio spectra methods, in Aluminum alloys. Under optimum conditions the analytical characteristics of the methods such as detection limit, accuracy, precision, relative standard deviation (RSD) and relative standard error (RSE) were calculated. The results showed that the proposed methods are simple, rapid, accurate and precise for simultaneous spectrophotometric determination of Gallium and Nickel in Aluminum alloys.

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