Abstract
This study investigated lead (Pb) sorption by inorganic and acid-non-soluble organic fractions, which were physicochemically fractionated from cattle, swine, and poultry composts, to understand how Pb is immobilized by animal manure compost and to evaluate the contribution of each fraction in Pb immobilization. Pb was predominantly sorbed on humic acid in the acid-non-soluble organic fraction; on the other hand, Pb sorption by the inorganic fraction could be attributed to the precipitation of Pb compound minerals such as lead phosphate and lead sulfate. The amounts of Pb sorbed on the inorganic fraction were 4.1–8.1 times higher than that sorbed on the acid-non-soluble organic fraction. The amount of Pb sorbed on the inorganic fraction and acid-non-soluble organic fractions was 37–60 and 19–43 %, respectively, of the total Pb sorbed. The results of this study clearly show that the inorganic fraction in the composts effectively immobilizes Pb. Furthermore, the high content of the inorganic components, particularly phosphorus, is important in Pb immobilization.
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