Abstract

Diisononyl phthalate (DINP) is one of the widely used dialkyl phthalate (DAPs) softeners in the production of flexible polyvinyl chloride (PVC) plastics, copolymers, and resins. These phthalate plasticizers are incorporated into the PVC polymer matrix to impart flexibility and workability in producing a wide range of consumer goods such as building materials, automobile parts, vinyl upholstery, wire, cables, plastisols, clothing, footwear, rain gear, playground equipment, and children’s products such as toys and teethers. Semirigid PVC contains approximately 10% (w/w) plasticizer, and flexible PVC as much as 60%. Combined with their noncovalent bond to polymer matrices as well as their potential release and migration from plastic, the widespread production and use of DAPs in North America, Europe, and Japan make their environmental fate and human health effects a matter of concern (Staples et al. 1997a,b; Oie et al. 1997; EU 1998a,b).

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