3-Bromo-1-propyne

CAS RN: 106-96-7

Exposure Summary

3-Bromo-1-propyne's production and use as a chemical intermediate may result in its release to the environment through various waste streams; former production and use as a soil fumigant may have resulted in its direct release to the environment. If released to air, an estimated vapor pressure of 108 mm Hg at 25 deg C indicates 3-bromo-1-propyne will exist solely as a vapor in the atmosphere. Vapor-phase 3-bromo-1-propyne 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 days. 3-Bromo-1-propyne does not contain chromophores that absorb at wavelengths >290 nm and therefore is not expected to be susceptible to direct photolysis by sunlight. If released to soil, 3-bromo-1-propyne is expected to have very high mobility based upon Koc values of 1.1 and 5.3. Volatilization from moist soil surfaces is expected to be an important fate process based upon a Henry's Law constant of 1.13X10-3 atm-cu m/mole. 3-Bromo-1-propyne may volatilize from dry soil surfaces based upon its vapor pressure. Biodegradation in soil is not expected to compete with chemical degradation processes based on similar half-lives in sterile soil (0.37-11 days) and nonsterile soil (0.046-12 days). It has been proposed that the alkylation of soil organic matter is the primary degradation process for 3-bromo-1-propyne in soil. If released into water, 3-bromo-1-propyne is not expected to adsorb to suspended solids and sediment based upon the Koc values. No biodegradation data for water systems were available. 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 2 hours and 5 days, respectively. An estimated BCF of 3 suggests the potential for bioconcentration in aquatic organisms is low. 3-Bromo-1-propyne is expected to undergo hydrolysis based on measured half-lives of 64 and 47 days at 22 and 25 deg C, respectively. Occupational exposure to 3-bromo-1-propyne may occur through inhalation and dermal contact with this compound at workplaces where 3-bromo-1-propyne is produced or used. (SRC)
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