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W. Hummel, M. A. Glaus and L. R. Van Loon, “Trace Metal-Humate Interactions. II. The ‘Conservative Roof” Model and Its Application,” Applied Geochemistry, Vol. 15, 2000, pp. 975-1001. doi:10.1016/S0883-2927(99)00100-6

has been cited by the following article:

• TITLE: Determination of Apparent Formation Constants of Eu(III) with Humic Substances by Ion Selective Liquid Membrane Electrode

  AUTHORS: Takayuki Sasaki, Hatsumi Yoshida, Taishi Kobayashi, Ikuji Takagi, Hirotake Moriyama

  KEYWORDS: Apparent Formation Constant; Humic Substance; Eu(III); Ion Selective Electrode; Titration

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.3 No.7, July 17, 2012

  ABSTRACT: This is the novel measurement of the apparent formation constants of trivalent lanthanide with humic substances by potentiometric titration using an ion selective electrode (ISE) consisting of bis(diphenylphosphoryl)methane as an ionophore. The ISE prepared exhibited a Nernstian response to the Eu3+ concentration in the test solutions in the presence of humic acid and fulvic acid. The effect of the solution conditions, including the pH, initial metal and humic substance concentrations, and ionic strength, on the formation constants was examined. The present formation constants were compared with the reported data using solvent extraction method.