- P-ISSN 1225-0163
- E-ISSN 2288-8985
한외여과법을 이용하여 휴믹산(Aldrich Co.)을 분자량 별로 3개의 소부분(<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)으로 분리한 뒤, 적외선 분광법과 고체상태 C-13 핵자기공명 분광법을 이용하여 각 소부분의 구조적 특성을 규명하였고, pH 적정법을 이용하여 각 소부분의 카르복실산 작용기 함량을 결정하였다. 휴믹산과 금속이온과의 착물 반응 특성을 규명하기 위하여, Eu(III)과 각 소부분 휴믹산과의 착화합물(<TEX>$[Eu(III)]
A humic acid(HA, Aldrich Co) sample was subjected to ultrafiltration for molecular size fractionation and three fractions of different nominal size(<TEX>$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)]