出版社：Korean Society of Environmental Health and Toxicology
摘要：Objectives: Potential environmental risks caused by chemicals that could be released from a recycled plastic product were assessed using a screening risk assessment procedure for chemicals in recycled products. Methods: Plastic slope protection blocks manufactured from recycled plastics were chosen as model recycled products. Ecological risks caused by four model chemicals – di-(2-ethylhexyl) phthalate (DEHP),diisononyl phthalate (DINP),cadmium (Cd),and lead (Pb)– were assessed. Two exposure models were built for soil below the block and a hypothetic stream receiving runoff water. Based on the predicted no-effect concentrations for the selected chemicals and exposure scenarios,the allowable leaching rates from and the allowable contents in the recycled plastic blocks were also derived. Results: Environmental risks posed by slope protection blocks were much higher in the soil compartment than in the hypothetic stream. The allowable concentrations in leachate were 1.0×10-4,1.2×10-5,9.5×10-3,and 5.3×10-3 mg/L for DEHP,DINP,Cd,and Pb,respectively. The allowable contents in the recycled products were 5.2×10-3,6.0×10-4,5.0×10-1,and 2.7×10-1 mg/kg for DEHP,DINP,Cd,and Pb,respectively. Conclusions: A systematic ecological risk assessment approach for slope protection blocks would be useful for regulatory decisions for setting the allowable emission rates of chemical contaminants,although the method needs refinement.
