Disappearance of aluminum tridecamer from hydroxyaluminum solution in the presence of humic acid

Noriko Yamaguchi, Syuntaro Hiradate, Masaru Mizoguchi, Tsuyoshi Miyazaki

研究成果: Contribution to journalArticle査読

14 被引用数 (Scopus)

抄録

We investigated the influences of humic acid on the removal of Al tridecamer (Al13) from a hydroxyaluminum (HyA) solution at various humic acid/Al ratios. The Al species contained in the solution were analyzed by using a liquid-state 27Al-NMR and an atomic absorption spectrometer and fractionated into three Al species: (i) Al13, (ii) Al monomer and dimer (AlSYM), and (iii) other undefined species including aggregated/precipitated Al (AlNON). By the addition of humic acid to the HyA solution, the concentration of Al13 was rapidly decreased within 0.007 d (10 min). The decrease in Al13 and the increase in AlNON were more pronounced at a higher humic acid/Al ratio. When the molar ratio of humic acid carboxylic groups to Al exceeded 0.8, Al13 was undetected from solution within 0.007 d. The formation of Al 13-humic acid complexes and the aggregation/precipitation of those complexes were a predominant mechanism in removing aqueous Al13 at the early stage of the reaction. Approximately 10 mol of carboxylic groups in humic acid were required to remove 1 mol of Al13 from the HyA solution. Aqueous Al13 had greater preference in precipitating with humic acid than AlSYM. After 5 to 570 d of aging, the concentration of Al13 and AlNON also decreased and increased, respectively, both in the presence and absence of humic acid. In conclusion, aqueous Al13 would not exist in soil solution under a high humic acid condition.

本文言語英語
ページ(範囲)1838-1843
ページ数6
ジャーナルSoil Science Society of America Journal
68
6
DOI
出版ステータス出版済み - 2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • Soil Science

フィンガープリント 「Disappearance of aluminum tridecamer from hydroxyaluminum solution in the presence of humic acid」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル