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Differences in Structural Characteristics and Eu(III) Complexation for Molecular Size Fractionated Humic Acid
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.2, pp.159-166
Shin,
H., Rhee,
D., &
Kang,
K.
(2001). Differences in Structural Characteristics and Eu(III) Complexation for Molecular Size Fractionated Humic Acid. Analytical Science and Technology, 14(2), 159-166.
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Abstract
A humic acid(HA, Aldrich Co) sample was subjected to ultrafiltration for molecular size fractionation and three fractions of different nominal size(<TEX>$F_1$</TEX>: 1,000-10,000 daltons; <TEX>$F_2$</TEX>: 10,000-50,000 daltons; <TEX>$F_3$</TEX>: 100,000-300,000 daltons) were obtained. The structural characteristics of the size-fractionated HA were analyzed using their IR and solid state C-13 NMR spectral data, and the carboxylate group contents of the humic acids were determined using their pH titration data. The <TEX>$^7F_0-{^5}D_0$</TEX> excitation spectra of Eu(III) complexes of the size-fractionated mgHA in aqueous solution were acquired(<TEX>$[Eu(III)]
- keywords
- humic Acid, solid state C-13 NMR, Eu (III) luminescence spectroscopy
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