Science Links Japan | For elucidating the mechanism of arsenic contamination of groundwater in Asia with special reference of research in Bangladesh. Constituent minerals of drilling samples at Samta, in Bangladesh and their characteristics for arsenic contaminated groundwater.

For elucidating the mechanism of arsenic contamination of groundwater in Asia with special reference of research in Bangladesh. Constituent minerals of drilling samples at Samta, in Bangladesh and their characteristics for arsenic contaminated groundwater.

Accession number;00A0386822

Title;For elucidating the mechanism of arsenic contamination of groundwater in Asia with special reference of research in Bangladesh. Constituent minerals of drilling samples at Samta, in Bangladesh and their characteristics for arsenic contaminated groundwater.

Author; AKAI JUNJI (Niigata Univ., Fac. of Sci.) YOSHIMURA NAOHISA (Niigata Univ., Fac. of Sci.) OFUJI HIROAKI (Niigata Univ., Fac. of Sci.) YABE JUN (Niigata Univ., Fac. of Sci.) NAKAMURA TAKEO (Niigata Univ., Fac. of Sci.) SHOJI HIROSHI (Niigata Univ., Fac. of Sci.) YOKOTA TAIKI (Niigata Univ., Fac. of Sci.) YOSHIDA MAMIKO (Niigata Univ., Fac. of Sci.) TSUCHIYA MITSUHIRO (Niigata Univ., Fac. of Sci.)

Journal Title;Earth Science

Journal Code:F0193A

ISSN:0366-6611

VOL.54;NO.2;PAGE.94-104(2000)

Figure&Table&Reference;FIG.10, REF.19

Pub. Country;Japan

Language;Japanese

Abstract;Drilling samples from sediments of the Ganges Delta, at Samta, Bangradesh, were mineralogically described by optical microscopy, SEM and TEM equipped with EDS, and arsenic concentrations were examined for most mineral species. Principal minerals of the sediments are quartz, micas, feldspars, chlorite and amphibole. Relative abundances show a little variation with depth. Clay minerals were identified to be mica clay minerals, chlorite, kaolin minerals and smectite. Under binocular microscope, almandine, calcite, dolomite, clinopyroxene, orthopyroxene, magnetite, ilmenite, topaz, ziron, toumaline, pyrite, Ti-oxides, etc. were also observed. Pyrite (especially, framboidal pyrite), precursor of the framboidal pyrite and iron oxides (and hydroxides) contained arsenic, and the contents of that decrease in this order. Another possible source for arsenic from wood flake fragments and organic matter were estimated. These data will become fundamental data for elucidation of dissolution mechanism. Possible mechanisms for arsenic discharge into groundwater were discussed. (author abst.)

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