Estimation of Redox Reactions of Deep Groundwaters in Japan

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Toshiyuki Hokari
Toshiyuki Hokari
1 entre for Infrastructure Engineering Institute of Technology

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pH and oxidation reduction potential (ORP) values of waters in original positions (insitu) were estimated using analytical data on deep groundwaters and hot spring waters at 67 points in Japan. A predominant redox reaction at each point was thermodynamically analysed on the basis of the Gibbs reaction energy. The results showed that a redox reaction of iron sulphide / sulphate ion was estimated to be predominant at many points, and that in a pH-ORP diagram, most of the in-situ pH and ORP estimates were on an equilibrium curve between pyrite and sulphate ion. It is suggested that the in-situ groundwaters in the Tertiary sedimentary rocks in Japan could be governed with the redox reaction of the iron sulphide / sulphate ion.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

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Not applicable for this article.

Toshiyuki Hokari. 2014. \u201cEstimation of Redox Reactions of Deep Groundwaters in Japan\u201d. Global Journal of Science Frontier Research - H: Environment & Environmental geology GJSFR-H Volume 14 (GJSFR Volume 14 Issue H3): .

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GJSFR Volume 14 Issue H3
Pg. 47- 55
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Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

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v1.2

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July 23, 2014

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English

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pH and oxidation reduction potential (ORP) values of waters in original positions (insitu) were estimated using analytical data on deep groundwaters and hot spring waters at 67 points in Japan. A predominant redox reaction at each point was thermodynamically analysed on the basis of the Gibbs reaction energy. The results showed that a redox reaction of iron sulphide / sulphate ion was estimated to be predominant at many points, and that in a pH-ORP diagram, most of the in-situ pH and ORP estimates were on an equilibrium curve between pyrite and sulphate ion. It is suggested that the in-situ groundwaters in the Tertiary sedimentary rocks in Japan could be governed with the redox reaction of the iron sulphide / sulphate ion.

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Estimation of Redox Reactions of Deep Groundwaters in Japan

Toshiyuki Hokari
Toshiyuki Hokari entre for Infrastructure Engineering Institute of Technology

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