汚泥施用土壌からの重金属溶出の潜在的な危険性

概要

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To elucidate the potentiality of the elution of heavy metals from soils amended with sludges, the relationship between the amounts of Zn and Cu extracted from sldges and sludge-amended soils with various concentrations of acids and the pH of the extractants were in vestigated. 1) The amount of Zn extracted from the sludges increased with the decrease in pH of the extractants when the pH was below 5.5. More than 90% of the total Zn was extracted by the extractants with a pH of 2, while only about 5% of the total Zn in soil was extracted by extractants with a pH of 1. The amount of Cu extracted from sludges increased with the decrcase in pH when the pH was below 4/. 2) The amount of Zn extracted from soils amended with sludges increased when the pH was below 5.5 rcgardless of the types of soil and sludge. The amount of Cu extracted increased when the pH was below 4. 3) The amount of Zn and Cu extracted from sludge-amended soil by acid did not change greatly over the ten years since the application of sludge. These results suggest that the elution of heavy metals from sludge-amended soils is influenced greatly by pH and the potentiality of elution by acid does not change for a long time.
社団法人日本土壌肥料学会の論文
1998-04-05