Science Links Japan | Arsenic distribution in the surface geology of the Niigata Plain, central Japan. Source supply of arsenic in arsenic contaminated ground water problem. Part 1.

Arsenic distribution in the surface geology of the Niigata Plain, central Japan. Source supply of arsenic in arsenic contaminated ground water problem. Part 1.

Accession number;01A0132581

Title;Arsenic distribution in the surface geology of the Niigata Plain, central Japan. Source supply of arsenic in arsenic contaminated ground water problem. Part 1.

Author; KUBOTA YOSHIHIRO (Niigata Univ., Fac. of Sci.) ISHIYAMA YUTAKA (Niigata Prefectural Government, JPN) YOKOTA DAIKI (Enuesukankyo)

Journal Title;Earth Science

Journal Code:F0193A

ISSN:0366-6611

VOL.54;NO.6;PAGE.369-379(2000)

Figure&Table&Reference;FIG.8, TBL.6, REF.37

Pub. Country;Japan

Language;Japanese

Abstract;In order to consider source supply of arsenic in arsenic contaminated ground waters, the arsenic distribution in the surface geology of the Niigata Plain was investigated from the view point of alluvium forming processes. The following conclusions were reached: 1) Arsenic concentration in the surface geology is 0.1-2ppm for igneous rocks, 3-5ppm for sandstones and 8-12ppm for mudstones. Arsenic concentration in muddy facies were higher than others. Arsenic concentration increases in the soil horizons of the soil layer compared with the weathered and parent material layer. 2) Arsenic concentration of natural levee/back swamp sediments is 2-14ppm which is comparable to the strata in the hinterland. Arsenic concentration of lacustrine organic clay is 25-64ppm which is extremely high. 3) Arsenic concentration in the surface geology that are composed of Tertiary, Pleistocene, and Holocene is related to the ignition loss and clay particles content respectively. The increase in arsenic and iron concentrations in river waters is associated with the ascent of turbidity. The comparative arsenic concentrations in alluvium sediments and the strata in the hinterland could be considered that the supply of arsenic into the alluvium plain occurs as an ordinary geologic phenomena during the alluvium forming process. The organic muddy layer which contains high arsenic will be an important target in solving arsenic concentration and the exploration to safe underground waters. (author abst.)

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