Comparative studies of the reduction behavior of chromium(VI) by humic substances and their precursors

Ken Nakayasu, Masami Fukushima, Keiko Sasaki, Shunitz Tanaka, Hiroshi Nakamura

研究成果: Contribution to journalArticle査読

79 被引用数 (Scopus)

抄録

Hexavalent chromium (Cr[VI]) is reduced by dissolved organic carbons (DOCs) such as humic substances, tannic acid (TA), and gallic acid (GA). The kinetic constants and the resulting chemical species after the reduction were compared with each other. The kinetic constants for GA and TA, which are model precursors of humic substances, were two to three orders of magnitude larger than those for the humic substances when these kinetic constants were expressed as a function of the molar concentration of the reductive functional group (F(red)) in various DOCs. After the reduction of Cr(VI), the percentages of the species complexed with GA and TA were higher than those with the humic substances. This appears to be due to the formation of high molecular weight compounds by polymerization during the reduction of Cr(VI) and complexation of Cr(III) with the polymerized compounds. The UV-vis spectrophotometric data and gel permeation chromatography support this view.

本文言語英語
ページ(範囲)1085-1090
ページ数6
ジャーナルEnvironmental Toxicology and Chemistry
18
6
DOI
出版ステータス出版済み - 5 27 1999
外部発表はい

All Science Journal Classification (ASJC) codes

  • 環境化学
  • 健康、毒物学および変異誘発

フィンガープリント

「Comparative studies of the reduction behavior of chromium(VI) by humic substances and their precursors」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