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SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF Zn2+, Ni2+ WITH XYLENOL ORANGE IN SOME INDUSTRIAL WATERS/Phan Xuan Thao Nhi, Pham Van Tat/ Journal of Thu Dau Mot university, No 2 – 2011, p.30-39.

The formation constants and the concentration of [M] and [MLi] in complex solutions of Ni2+ and Zn2+ with xylenol orange were determined by spectrophotometric method and principal component analysis. In this way, the spectral data were used to calculate the formation constants of complexes between ions Ni2+ and Zn2+ with xylenol orange using algorithm of principal component analysis (PCA) in DATAN. The concentration values of Ni2+ and Zn2+ in synthetic solutions resulting from this technique using xylenol orange (XO) at pH 7.2 agree well with experimental data. This method can be applied to simultaneous determination of Ni2+ and Zn2+ in the industrial waste waters.

Từ khóa: Formation constant, spectrophotometric determination, principal component analysis

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