VOLCANIC INFLUENCE ON MERCURY IN SOILS OF KAGOSHIMA, SOUTHERN KYUSHU, JAPAN

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概要

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• A flameless atomic absorption spectrophotometer was used to obtain total Hg content of 16 soil profile samples collected from 4 different areas in southern Kagoshima, representing a wide variety of volcanic environment. The associated fresh volcanic ashes from Sakurajima were also analyzed. The background Hg levels in uncontaminated virgin soils as well as the extent of contamination from agricultural sources were determined. These soils averaged 40 ppb Hg with a range between 3 to 245 ppb and had a median value of 26 ppb. Agricultural practices had generally little effect on the total Hg content of soils, with the exception of paddy soils which showed surface enrichment of Hg up to the level of 245 ppb due to the previous mercurial applications. The Hg levels of the fresh volcanic ash samples collected were less than 10 ppb comparable to those of the C horizon samples. Against the view that volcanism is an important contributing factor in environmental Hg contamination, Hg contents of the virgin profile samples had no marked increased values either in recent deposits or in deposits over geological times, whereas rather significant accumulation in organic matter rich horizons may occur. The background figures with an average of 31 ppb seems low when compared to the reported normal Hg contents of geological materials from the world literatures. Calculation shows that only a small part of the atomospheric Hg could be adsorbed by the soil through rain, suggesting that direct supply of Hg from the atomosphere may be an additional factor to establish a soil-atmosphere Hg cycle. We conclude that the emitted Hg into air from the volcanic activity could not be accumulated by the soil well enough to be a significant natural source of soil pollution in this area, leaving most of the Hg to remain airborne for long distances.

• 社団法人日本土壌肥料学会の論文

著者

• Otsuka Hiroo

  Section Of Soils And Plant Nutrition Kyushu Agricultural Experiment Station Ministry Of Agriculture

• GOTOH Shigeyoshi

  Section of Soils and Plant Nutrition, Kyushu Agricultural Experiment Station, Ministry of Agricultur

• KOGA Hiroshi

  Section of Soils and plant Nutrition, Kyushu Agricultural Experiment Station, Ministry of Agricultur

• Gotoh Shigeyoshi

  Section Of Soils And Plant Nutrition Kyushu Agricultural Experiment Station Ministry Of Agriculture

• Koga Hiroshi

  Section Of Soils And Plant Nutrition Kyushu Agricultural Experiment Station Ministry Of Agriculture

関連論文

• VOLCANIC INFLUENCE ON MERCURY IN SOILS OF KAGOSHIMA, SOUTHERN KYUSHU, JAPAN
• MERCURY IN SOIL DERIVED FROM IGNEOUS ROCK IN NORTHERN KYUSHU, JAPAN

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