Study on Arsenic Leaching Mechanism in Natural Ground

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  • 自然地盤における砒素溶出機構の検討
  • シゼン ジバン ニ オケル ヒソ ヨウシュツキコウ ノ ケントウ

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Abstract

<p>Estimating for leaching-mechanisms of heavy metals are important in order to understand the pollution state of peripheral environments of rock muck disposal sites.</p><p>This study examined the mechanisms of arsenic leaching from rock muck disposal sites at acid, alkaline and neutral conditions. The leaching-potential of heavy metals are from rock materials influenced by many parameters; e.g. the existing form of these elements in rock materials, the leaching mechanisms from rock materials, the advection/diffusion in aquifer and adsorption onto ground materials.</p><p>We examined the arsenic leaching mechanisms by two type experiments considering water-rock interaction; one is the static batch-leaching test and the other is the leaching te st under water flowing condition in soil tank test. </p><p>The results of the static leaching test show that water- rock interaction progresses under high Eh conditions is in constant solid-liquid proportion. It is suggested that the water flow condition leaching test can simulate the arsenite（H3AsO30） leaching mechanisms in reduction condition in aquifers.</p>

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