Abstract
The degradation of polydimethylsiloxanes (silicones) on a spiked standard soil matrix has been studied. Spiked soil was extracted to recover silicones, and the extract was examined by several analytical techniques, including gel permeation chromatography and high-pressure liquid chromatography with an inductively coupled plasma emission spectrometer as the detector. Silicones were found to degrade rapidly to low molecular weight α,ω-siloxanediol oligomers. Within 4-6 weeks, more than half of the initial spiked silicone is converted to a water-soluble fraction consisting mostly of 1,1-dimethylsilanediol. Implications of this finding relative to the ultimate environmental fate of silicones is discussed.
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