Pyrrole

CAS RN: 109-97-7

Exposure Summary

Pyrrole's production and presence in creosote and in drug manufacturing may result in its release to the environment through various waste streams. If released to air, a vapor pressure of 8.35 mm Hg at 25 deg C indicates pyrrole will exist solely as a vapor in the ambient atmosphere. Vapor-phase pyrrole 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 4 days. Pyrrole does not absorb light in the environmental UV spectrum, and is not expected to directly photolyze. If released to soil, pyrrole is expected to have high mobility based upon an estimated Koc of 61. Volatilization from moist soil surfaces is expected to be an important fate process based upon a Henry's Law constant of 1.80X10-5 atm-cu m/mole. Pyrrole may potentially volatilize from dry soil surfaces based upon its vapor pressure. If released into water, pyrrole is not expected to adsorb to suspended solids and sediment in the water column based upon the estimated Koc. Pyrrole does not readily undergo biodegradation in water unless there exists bacteria that have had previous exposure to pyrrole. Given this need for acclimation, the decomposition of pyrrole may be very slow. 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 42 hours and 368 hours, respectively. An estimated BCF of 2 suggests the potential for bioconcentration in aquatic organisms is low. Hydrolysis is not expected to occur due to the lack of hydrolyzable functional groups. Occupational exposure to pyrrole may occur through inhalation, and dermal contact with this compound at workplaces where pyrrole is produced or used. The general population may be exposed to pyrrole through the consumption of food and use of creosote. (SRC)
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