Differences in Structural Characteristics and Eu(III) Complexation for Molecular Size Fractionated Humic Acid

Shin, Hyun-Sang; 신현상; Rhee, Dong-Seok; 이동석; Kang, Kihoon; 강기훈

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P-ISSN 1225-0163
E-ISSN 2288-8985

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Vol.14, No.2

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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, Hyun-Sang
Rhee, Dong-Seok
Kang, Kihoon

Shin, H., Rhee, D., & Kang, K. (2001). Differences in Structural Characteristics and Eu(III) Complexation for Molecular Size Fractionated Humic Acid. , 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($F_1$: 1,000-10,000 daltons; $F_2$: 10,000-50,000 daltons; $F_3$: 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 $^7F_0-{^5}D_0$ excitation spectra of Eu(III) complexes of the size-fractionated mgHA in aqueous solution were acquired($[Eu(III)]