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Sulfonephthalein dyes. V. Characterization of the color changes of methylxylenol blue in chelatometric titrations

K. Vytřas, V. Mach, and M. Malcová

Department of Analytical Chemistry, Institute of Chemical Technology, 532 10 Pardubice


Abstract:  The colour changes of methylxylenol blue in the chelatometric titrations of Cd , Ce3+, Co2+, Cu2+, Er3+, Hg2+, La3+, Mn2+, Pb2+, Sc3+, Sm3+, and Zn2+ were studied spectrophotometrically. The absorption spectra of the titrated solutions were used for. the calculation of the course of colour change curves in the colorimetric CIE—xy triangle and the complementary QxQy diagram. On the basis of this objective valuation the accuracy of visual titrimetric determinations was characterized by the indices of perceptibility of the colour change of methylxylenol blue at the end-point (Δv/ΔE)α→1.

Full paper in Portable Document Format: 305a648.pdf


Chemical Papers 30 (5) 648–654 (1976)

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