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KMID : 1024220130280010013
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Environmental Health and Toxicology : EHT
2013 Volume.28 No. 1 p.13 ~ p.13
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Ecological Risk Assessment of Chemicals Migrated from a Recycled Plastic Product
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:Roh Ji-Yeon
:Kim Min-Hyuck/:Kim Woo-Il/:Kang Young-Yeul/:Shin Sun-Kyoung/:Kim Jong-Guk/:Kwon Jung-Hwan
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Abstract
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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.
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KEYWORD
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Cadmium, Leachate, Lead, Phthalate esters, Recycled plastics
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