Acetyl Acetone

CAS RN: 123-54-6

Exposure Summary

Acetyl acetone's production and use as gasoline additives, lubricant additives, driers for varnishes and printers inks, and dyes may result in its release to the environment through various waste streams. Acetyl acetone's former use as fungicide, bactericide, wood preservative and insecticide, will result in its direct release to the environment. If released to air, a vapor pressure of 2.69 mm Hg at 20 deg C indicates acetyl acetone will exist solely as a vapor in the atmosphere. Vapor-phase acetyl acetone 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 14 days. Based on its high water solubility(166,000 mg/L), removal from air via wet deposition may occur. Acetyl acetone 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, acetyl acetone is expected to have very high mobility based upon an estimated Koc of 39. Volatilization from moist soil surfaces is expected to be an important fate process based upon an estimated Henry's Law constant of 2.3X10-6 atm-cu m/mole. Acetyl acetone may volatilize from dry soil surfaces based upon its vapor pressure. In a screening study using settled sewage seed at 20 deg C, 5.6, 40.0, 62.8, and 69.6 % of theoretical BOD was determined after 5, 10, 15, and 20 incubation days, respectively. This study suggests that biodegradation of acetyl acetone may be an important process in both soil and water. If released into water, acetyl acetone is not expected to adsorb to suspended solids and sediment based upon the estimated Koc. Volatilization from water surfaces is expected to be an important fate process based upon this compound's estimated Henry's Law constant. Estimated volatilization half-lives for a model river and model lake are 16 days and 120 days, respectively. An estimated BCF of 3.2 suggests the potential for bioconcentration in aquatic organisms is low. Acetyl acetone is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyze under environmental conditions. Occupational exposure to acetyl acetone may occur through inhalation and dermal contact with this compound at workplaces where acetyl acetone is produced or used. Monitoring data indicate that the general population may be exposed to acetyl acetone via inhalation of ambient air, ingestion of food and drinking water, and dermal contact with this compound and other products containing acetyl acetone. (SRC)
Find more information on this substance at: PubChem, PubMed