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  [in Japanese] Reduction of Gold (aq) Complexes at Hydrothermal Condition by Humic Acid and Simple Organic Materials  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 大沢 正人 OHSAWA Masato
    • 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 Department of Astronomy and Earth Sciences, Faculty of Education, Tokyo Gakugei University|(Present address) Research and Development Group, Technical Division, Toshiba Monofrax Company
    • 本間 久英 HONMA Hisahide
    • 東京学芸大学教育学部地学科 Department of Astronomy and Earth Sciences, Faculty of Education, Tokyo Gakugei University
    • 中田 正隆 NAKATA Masataka
    • 東京学芸大学教育学部地学科 Department of Astronomy and Earth Sciences, Faculty of Education, Tokyo Gakugei University

Abstract

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<sup>-5</sup>s<sup>-1</sup> and the activation energy is 27 ± 3kJ・mol<sup>-1</sup>. 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<sup>-5</sup>s<sup>-1</sup>, acetic acid : the order of 10<sup>-6</sup>s<sup>-1</sup>). 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.

Journal

  • Chikyukagaku

    Chikyukagaku 32(3), 139-147, 1998

    The Geochemical Society of Japan

References:  21

Codes

  • NII Article ID (NAID)
    110008679954
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0386-4073
  • NDL Article ID
    4549096
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
Page Top