1,3-Pentadiene

CAS RN: 504-60-9

Exposure Summary

1,3-Pentadiene's production and use as a co-monomer in the manufacture of polymers, maleic anhydride and as a chemical intermediate may result in its release to the environment through various waste streams. It may also be released to the environment during the combustion of biomass, from waste incinerators, and in the exhaust of motor vehicles. The commercial mixture of 1,3-pentadiene consists of 80% of the trans-isomer and 20% of the cis-isomer. If released to air a vapor pressure of 405 mm Hg at 25 deg C indicates 1,3-pentadiene will exist solely as a vapor in the ambient atmosphere. Vapor-phase 1,3-pentadiene will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals and ozone molecules. The half-life for the reaction in air with hydroxyl radicals is estimated to be 4 hours. The half-life for the reaction in air with ozone is estimated to be 5 hours. The vapor-phase reaction of 1,3-pentadiene with nitrate radicals may also be an important atmospheric removal process in urban areas at night, but the rate of this reaction is not known. If released to soil, 1,3-pentadiene is expected to have low mobility based upon an estimated Koc of 500. Volatilization from moist soil surfaces is expected to be an important fate process based upon an estimated Henry's Law constant of 0.069 atm-cu m/mole. 1,3-Pentadiene may volatilize from dry soil surfaces based upon its vapor pressure. If released into water, 1,3-pentadiene is expected to adsorb to suspended solids and sediment in water based upon the estimated Koc. No biodegradation data were located for 1,3-pentadiene, but the biodegradation half-life of a similar compound, 1,3-butadiene, has been reported as 7 days in aerobic water and 28 days in anaerobic water. These data suggest that 1,3-pentadiene will also be biodegraded in aquatic systems. Volatilization from water surfaces is expected to be an important environmental fate process based upon this compound's estimated Henry's Law constant. Estimated volatilization half-lives for a model river and model lake are 1 and 78 hours, respectively. An estimated BCF of 15 suggests the potential for bioconcentration in aquatic organisms is low. Hydrolysis is not expected to be an important environmental fate process since this compound lacks functional groups that hydrolyze under environmental conditions. Occupational exposure may occur through inhalation and dermal contact with this compound at workplaces where 1,3-pentadiene is produced or used. (SRC)
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