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茂原ガス田の地下水中有機酸

Organic acid dissolving in groundwater in the Mobara gas field

亀井 玄人

not registered

海水起源堆積岩中地下水の代表例として、千葉県茂原ガス田の地下水を対象に、有機炭素(TOC)および有機酸(ギ酸、酢酸、乳酸、コハク酸、プロピオン酸 、吉草酸、酪酸、フミン酸およびフルボ酸)についても濃度を測定した。その結果、TOCが22$$pm$$1$$sim$$24$$pm$$0MG/Lの値を示し、有機酸はコハク酸とフルボ酸のみが検出され、それぞれ5.8$$pm$$0.5$$sim$$8.3$$pm$$0.3MG/Lの濃度であった。地下水の温度やSO42-濃度を考慮すると、微生物の活動によってたとえばCH3COO- + H2O = HCO3- +CH4 のように示される反応が進行し、メタンとして滞留しているものと考える。

As a representative of natural marine groundwater, the author selected pumped water from a Quaternary sedimentary aquifer of the Mobara gas-field in Japan and measured the concentration of total organic carbon (TOC) and of organic acid anions (formic, acetic, lactic, succinic, humic, fulvic, propionic, valeric and butyric acids). The concentration of TOC ranged from 22$$pm$$1 to 24$$pm$$0mg/L. As organic acid anions, only succinic and fulvic acids were detected and each concentration was given to be from 5.8$$pm$$ 0.5 to 8.3$$pm$$0.3 and from 3.3$$pm$$0.2 to 3.5$$pm$$0.2mg/L, respectively. By consideration of the temperature and the [SO$$_{4}$$$$^{2-}$$] of the groundwater, it is inferred that the organic acid has been significantly decomposed by activities of microbes, such as the fermentation process, CH$$_{3}$$COO$$^{-}$$ + H$$_{2}$$O = HCO$$_{3}$$$$^{-}$$ + CH$$_{4}$$.

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