Comments by "MrMustangMan" (@mrmustangman) on "Channel 4 News"
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Vinyl chloride is also an anaerobic biodegradation product of higher chlorinated compounds such as tetrachloroethylene and trichloroethylene. If released to air, a vapor pressure of 2980 mm Hg at 25 deg C indicates vinyl chloride will exist solely as a gas in the atmosphere. Gas-phase vinyl chloride will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals and ozone; the half-lives for these reactions in air are estimated to be 2.3 and 46 days, respectively. Vinyl chloride, exposed to light >290 nm for 17 hours was photo-degraded 15.3%. If released to soil, vinyl chloride is expected to have high mobility based upon a Koc of 57. Volatilization of vinyl chloride from soil has reported half-lives of 0.2-0.5 days at soil depths of 1 and 10 cm, respectively. Vinyl chloride may volatilize from dry soil surfaces based upon its vapor pressure. Vinyl chloride had a biodegradation rate of 1.456 ug/g soil/hr in soil. Vinyl chloride was degraded approximately 20-50% and 55-100% in 4 and 11 weeks, respectively, under anaerobic conditions in laboratory scale soil experiments. If released into water, vinyl chloride is not expected to adsorb to suspended solids and sediment based upon the Koc. The biodegradation half-life of vinyl chloride in aerobic and anaerobic waters was reported as 28 and 110 days, respectively. Volatilization from water surfaces is expected to be an important fate process based upon this compound's Henry's Law constant of 0.0278 atm-cu m/mole. Estimated volatilization half-lives for a model river and model lake are 2 hours and 3 days, respectively. A Bio-Concentration Factor of <10, measured in fish, suggests bioconcentration in aquatic organisms is low. Vinyl chloride is not expected to undergo hydrolysis in the environment based on reported hydrolysis half-lives of >9.91 to >107 years.
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