CAS RN:107-87-9

Exposure Summary

2-Pentanone's production and use as a solvent and a substitute for diethyl ketone may result in its release to the environment through various waste streams. 2-Pentanone occurs naturally in many fruits and plants. It is released into the environment as a plant volatile as well as a product of combustion, photooxidation, and microbial degradation. If released to air, a vapor pressure of 35.4 mm Hg at 25 deg C indicates 2-pentanone will exist solely as a vapor in the atmosphere. Vapor-phase 2-pentanone will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; the half-life for this reaction in air is estimated to be 3.5 days. 2-Pentanone contains chromophores that absorb at wavelengths >290 nm and therefore may be susceptible to direct photolysis by sunlight. If released to soil, 2-pentanone is expected to have high mobility based upon an estimated Koc of 75. Volatilization from moist soil surfaces is expected to be an important fate process based upon a Henry's Law constant of 8.36X10-5 atm-cu m/mole. 2-Pentanone may volatilize from dry soil surfaces based upon its vapor pressure. 2-Pentanone has been shown to biodegrade under aerobic conditions. If released into water, 2-pentanone is not expected to adsorb to suspended solids and sediment based upon the estimated Koc. 2-Pentanone is expected to biodegrade in water based on a screening test designed to simulate a polluted river, where the 5 day theoretical BOD for 2-pentanone was 43%. Volatilization from water surfaces is expected to be an important fate process based upon this compound's Henry's Law constant. Estimated volatilization half-lives for a model river and model lake are 12 hours and 6.6 days, respectively. An estimated BCF of 3 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 to 2-pentanone may occur through inhalation and dermal contact with this compound at workplaces where 2-pentanone is produced or used. Monitoring data indicate that the general population may be exposed to 2-pentanone via inhalation of ambient air, ingestion of food and drinking water, and dermal contact with this compound or other products containing 2-pentanone. (SRC)
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