Spectrophotometric Determination of Lanthanoids With Methylxylenol Blue

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  • UEDA Joichi
    Deparment fo Chemistry Faculty of Education, Knazawa Unibersity

Bibliographic Information

Other Title
  • メチルキシレノールブルーによるランタノイドの吸光光度定量

Description

Amethod is described for the spectrophotometric determinationof.lanthanum, cerlum(III) prase dymium, ne dymium, samarium, eur pium, gad 1inium dysprosimh erbium thtilium, ytterbium (III) and lutetium with methylxylenol blue (MXB).<BR>MXB reacts with lanthanoids to form water-soluble bluish-vio1et complexes and these aqueous solutions have their absorption maxima at 568-576nm. The pH range over which the co1oration is stable varies from pH 9.0-9.7(La)topH 6.8-7.3(Lu). The sensitivities (Sandell's expression) of the determination for each of lanthananoids are between 0.0037-0.0054ug/cm2.<BR>On the other hand, lanthanoids react with MXB in the presence of cethyltrimethylammonium brmide(CTMAB) to form water-soluble blue complexes and the absorption maxima f these colored solutions appear within 630-650 nm. Maximum color developments are obtained in the pH 7-9. The reactions are quite sensitive and the sensitivities according to Sandell's expresslon are between 0.0017-0.0032g/cm2. Beer's law is obeyed for the complexes of lanthanum, cerium(III), praseodyum and neodyum at concentration up to L69/ml and for others up to 2.0ug/ml. As a result of investgation of the composition of praseodymium or gadolinium or lutetium comlex, the mole ratio of metal, MXB and CTMAB is esimated to be 1:2:3.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1973 (4), 724-728, 1973-04-10

    The Chemical Society of Japan

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