Trace Element Analysis in Precipitation as an Environmental Indicator

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  • 環境指標としての降水中の微量元素
  • カンキョウ シヒョウ ト シテ ノ コウスイチュウ ノ ビリョウ ゲンソ

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Abstract

The trace elements in precipitation were investigated from the view point of utility as an environmental indicator. Precipitations were collected in Yalung Kang glacier (non-polluted, Himalaya, Nepal), Kiryu (meso-polluted, Shiga prefecture), and Shogun-zuka (highly polluted, Kyoto city). The trace elements, such as Al, Ca, Fe, Mg, Mn, Na, Ce, Co, Cr, Cs, La, Sb, Sc, Sm, Th, and V, in water samples were determined by means of non-destructive thermal neutron activation analysis. The concentration level of trace elements varied seasonally in the range from several to about one hundred times. Since the concentrations of Na in precipitation samples decreased with the distance from sea to sampling sites, it is plausible to say that they reflect the maritime effect. The concentrations of Mn, V, and Sb were higher at Kiryu and Shogun-zuka than at Yalung Kang. This can be attributed to the environmental pollution resulting from various industrial activities and automobiles. Airborne dust particles seem to influence on the concentrations of Al, Ca, and Mg in rain waters.

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