低温熱水溶液中でのフミン酸および単純有機物による金(III)イオンの還元

• 大沢 正人

  東京学芸大学教育学部地学科 (現)東芝モノフラックス株式会社技術部開発G

• 本間 久英

  東京学芸大学教育学部地学科

• 中田 正隆

  東京学芸大学教育学部地学科

書誌事項

タイトル別名

• Reduction of Gold (aq) Complexes at Hydrothermal Condition by Humic Acid and Simple Organic Materials
• テイオン ネツスイヨウエキ チュウ デ ノ フミンサン オヨビ タンジュン ユ

抄録

The reduction rate of gold (aq) complexes by humic acid simple organic materials were experimentally determined. The reduction rate of gold (aq) complex by humic acid in the range of 80-120℃ is fast. It's reaction rate constant is in the order of 10^-5s^-1 and the activation energy is 27 ± 3kJ・mol^-1. Comparison of the obtained data with earlier works indicates that the activation energy on the reduction of gold (aq) complexes has a tendency to increase with the increase of the maturity of organic materials (humic acid-lignite-anthracitic coal). Simple organic materials, for example, alcohol and carboxylic acid, were also found to reduce gold (aq) complexes. Ethanol showed one order higher reaction rate constant than acetic acid (ethanol: the order of 10^-5s^-1, acetic acid : the order of 10^-6s^-1). It suggests that the reduction rate depends on functional group of organic material. The reaction rate of gold (aq) complexes by natural organic matters and the activation energy may depend on functional groups and their amounts, the maturity and structure of natural organic matters.

収録刊行物

• 地球化学

  地球化学 32 (3), 139-147, 1998-08-25

  一般社団法人日本地球化学会

キーワード

• gold
• reduction
• humic acid
• organic matters
• hydrothermal

詳細情報

• CRID: 1390282680718607104
• NII論文ID: 110008679954
• NII書誌ID: AN00141280
• DOI: 10.14934/chikyukagaku.32.139
• ISSN: 21885923
• ISSN: 03864073
• NDL書誌ID: 4549096
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4549096
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可