愛媛県砥部町の砒素に富む万年変質安山岩体周辺の河川水中の微量元素濃度  [in Japanese] Trace element abundance in river water around the Mannen altered andesite body, Tobe-town, Ehime Prefecture, Japan  [in Japanese]

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Abstract

Seventeen trace element abundance (Li, Al, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, As, Rb, Sr, Cd, Cs, Ba and Pb) for 4 fountains and 8 river waters derived from the high As-bearing Mannen andesite body, Tobe-town, Ehime prefecture, were determined for environmental assessment by inductively coupled plasma-mass spectrometry (ICP-MS). We had predicted high arsenic contents in the surface waters, because the local geologic background contains extremely high arsenic content (max. 1200 ppm As). The arsenic contents in the waters are low (<3.5 ng/g) contrary to our expectations, which the concentrations of the arsenic are below the environmental standard (<10 ng/g As). However, there is still in danger of increasing the arsenic contents by abrupt environmental change such as expansion project of road and tunnel in the area. The construction may produce large amount of rock debris including abnormally high arsenic. Consequently, further weathering of the debris at the surface condition must cause new liquation into surface water of arsenic from the rock. On the other hand, river water around the former Choshi-daki sulfide-ore Mine in the andesite body contains abnormally high zinc content (ca. 200 ng/g). This must be influenced by solve out of zinc ions to the water from the country rock. We need further environmental monitoring for the water condition.

Seventeen trace element abundance (Li, Al, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, As, Rb, Sr, Cd, Cs, Ba and Pb) for 4 fountains and 8 river waters derived from the high As-bearing Mannen andesite body, Tobe-town, Ehime prefecture, were determined for environmental assessment by inductively coupled plasma-mass spectrometry (ICP-MS). We had predicted high arsenic contents in the surface waters, because the local geologic background contains extremely high arsenic content (max. 1200 ppm As). The arsenic contents in the waters are low (<3.5 ng/g) contrary to our expectations, which the concentrations of the arsenic are below the environmental standard (<10 ng/g As). However, there is still in danger of increasing the arsenic contents by abrupt environmental change such as expansion project of road and tunnel in the area. The construction may produce large amount of rock debris including abnormally high arsenic. Consequently, further weathering of the debris at the surface condition must cause new liquation into surface water of arsenic from the rock. On the other hand, river water around the former Choshi-daki sulfide-ore Mine in the andesite body contains abnormally high zinc content (ca. 200 ng/g). This must be influenced by solve out of zinc ions to the water from the country rock. We need further environmental monitoring for the water condition.

Journal

  • Memoirs of the Faculty of Science,Ehime University

    Memoirs of the Faculty of Science,Ehime University 11, 47-57, 2005

    Ehime University

Cited by:  1

Codes

  • NII Article ID (NAID)
    110004715626
  • NII NACSIS-CAT ID (NCID)
    AN10408332
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • Journal Type
    大学紀要
  • ISSN
    09195203
  • NDL Article ID
    7731668
  • NDL Source Classification
    ZM2(科学技術--科学技術一般--大学・研究所・学会紀要)
  • NDL Call No.
    Z14-2057
  • Data Source
    CJPref  NDL  NII-ELS  IR 
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