有機金属の環境指標としての有用性の検討(タンデトロン加速器質量分析計業績報告2002(平成14)年度)

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  • Evaluation of organometals as an indicator of environmental assessment : case of Lake Biwa sediments(Summaries of Researches Using AMS)

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Abstract

The organometal, which consists of organic compound and metal, is regarded to be hardly affected by the geology of the hinterland. Thus, it may be useful as a new indicator of environmental assessment. In this study, organometals in sediments of Biwa Lake are analyzed, and their usefulness as an indicator of environmental assessment is discussed. The vertical distribution of organometals does not correlate with that of major elements. Since major element compositions are controlled mainly by the geology of hinterland, organometals is hardly affected by major elements. The vertical distribution of these elements are roughly divied into three groups: 1) elements with no clear variation of the content against burial depth such as Fe Mn Ni and Cu; Artificial pollution of these elements are not detected in the bottom sediments in Lake Biwa, 2) elements with higher content in surface layers such as Mn, Fe Ni and Cu; Increase for Fe and Mn may be ascribed to the effect of bacterial accumulation, and increase for Ni and Cu may be due to artificial addition. There is a strong correlation between Ni and Cu, and 3) elements with the highest content near 20cm layer such as Co, As ans Se; They are positively correlated with organic carbon, that is, organic matters. In the case of Lake Biwa, the organometals that could be used as an indicator of anthropogenic pollution are Ni and Cu. Artificial poluution of Ni and Cu have been increased during this 100year.

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