Journal article

The environmental fate of phthalate esters: A literature review

Staples C, Peterson D, Parkerton T, Adams W ...see all

Chemosphere, vol. 35, issue 4 (1997) p. 667–749

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A comprehensive and critical review was performed on the environmental fate of eighteen commercial phthalate esters with alkyl chains ranging from 1 to 13 carbons. A synthesis of the extensive literature data on physicochemical properties, partitioning behavior, abiotic and biotic transformations and bioaccumulation processes of these chemicals is presented. This chemical class exhibits an eight order of magnitude increase in octanol-water partition coefficients (K-ow) and a four order of magnitude decrease in vapor pressure (VP) as alkyl chain length increases from 1 to 13 carbons. A critical review of water solubility measurements for higher molecular weight phthalate ester; (i.e. alkyl chains greater than or equal to 6 carbons) reveals that most published values exceed true water solubilities due to experimental difficulties associated with solubility determinations for these hydrophobic organic liquids. Laboratory and field studies show that partitioning to suspended solids, soils, sediments and aerosols increase as K-ow increases and VP decreases. Photodegradation via free radical attack is expected to be the dominant degradation pathway in the atmosphere with predicted half-lives of ca. 1 day for most of the phthalate esters investigated. Numerous studies indicate that phthalate esters are degraded by a wide range of bacteria and actinomycetes under both aerobic and anaerobic conditions. Standardized aerobic biodegradation tests with sewage sludge inocula show that phthalate esters undergo greater than or equal to 50% ultimate degradation within 28 days. Biodegradation is expected to be the dominant loss mechanism in surface waters, soils and sediments. Primary degradation half-lives in surface and marine waters range from

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  • C. A. Staples

  • D. R. Peterson

  • T. F. Parkerton

  • W. J. Adams

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