SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 78831
CASRN 78-83-1
SynonymsIsobutyl alcohol
1-Propanol, 2-methyl-
Analytical Methods EPA Method 8260

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use USED IN HYDRAULIC FLUID & AS A CHEMICAL INTERMEDIATE IN MANUFACTURE OF ISOBUTYL ESTERS, WHICH SERVE AS PLASTICIZERS, & IN PERFUMES USEFUL IN FLAVORS SUCH AS RUM, BANANA, AND FRUIT FLAVORS. SOLVENT FOR SURFACE COATINGS & ADHESIVES; PROCESSING SOLVENT IN PHARMACEUTICAL, PESTICIDE, FLAVOR, & FRAGRANCE MFR; CHEM INT FOR ISOBUTYLAMINES, ZINC DIISOBUTYLDITHIOPHOSPHATE, ISOBUTYL ACETATE, ACRYLATE, METHACRYLATE ESTERS, ACRYLATE, & METHACRYLATE ESTERS; DILUENT-REACTANT IN THE ALKYLATION OF AMINO RESINS; COSOLVENT IN TERTIARY OIL RECOVERY Isobutyl alcohol is used with dimethyl sulfoxide to prepare food additives such as sucrose fatty acid esters Used for amino resin alkylation Manufacture ester for fruit flavoring essences; solvent in paint, varnish removers
Consumption Patterns SOLVENT (EG, FOR SURFACE COATINGS & ADHESIVES & FOR PHARMACEUTICAL, PESTICIDE, FLAVOR & FRAGRANCE MFR), 26%; CHEM INT FOR ISOBUTYLAMINES, 22%; CHEM INT FOR ZINC DIISOBUTYLDITHIOPHOSPHATE, 17%; CHEM INT FOR ISOBUTYL ACETATE, 13%; CHEM INT FOR ACRYLATE & METHACRYLATE ESTERS, 4%; DILUENT-REACTANT IN PRODN OF AMINO RESINS, 4%; OTHER USES, 14% (1979)
Apparent Color COLORLESS LIQUID
Odor Sweet musty odor ; SUFFOCATING ODOR OF FUSEL OIL ; SLIGHTLY SUFFOCATING; NONRESIDUAL ALCOHOLIC
Melting Point -108 DEG C
Odor Threshold Concentration 40 ppm
Sensitivity Data Vapor: Irritating to eyes, nose and throat.
Environmental Impact Isobutyl alcohol will enter the environment as emissions from its manufacture and use as a solvent and release in fermentation. It naturally occurs as a plant volatile and is released during the microbial degradation of animal wastes. When released into water, isobutyl alcohol will be lost by evaporation and biodegradation. It would not be expected to adsorb to sediment or bioconcentrate in fish. No data on its rate of degradation in natural waters could be found. When spilled on land it is apt to volatilize, biodegrade, and leach into ground water but no data on the rates of these processes could be found. Its fate in ground water is unknown. In the atmosphere it will photodegrade primarily by reaction with hydroxyl radicals in hours to days, with the half-life being shorter in more polluted atmospheres. Human exposure will be primarily in occupational atmospheres, ingesting food in which it is used as a fruit flavoring, or being in proximity to sites where it is released naturally (some plants, decay of animal wastes, etc.).
Environmental Fate TERRESTRIAL FATE: When spilled on soil, isobutyl alcohol will both evaporate and leach into the ground due to its relatively high vapor pressure and low adsorption to soil. Although it readily degrades in laboratory tests, its degradation in soil has not been determined. If degradation is not rapid, it is apt to leach into ground water. AQUATIC FATE: When released into water, isobutyl alcohol will volatilize (half-life in a river approximately 4 days) and biodegrade. Although it is readily degradable in laboratory tests and is reported to degrade in natural waters, no data on its rate of degradation in surface waters could be found. Its degradation in ground water is unknown. ATMOSPHERIC FATE: When released into the atmosphere, isobutyl alcohol will photodegrade with a half-life ranging from hours in polluted urban atmospheres, to days in cleaner atmospheres.
Drinking Water Impact SURFACE WATER: Hayashida River, Japan-site of leather industry 685 ppb . DRINKING WATER: Detected, not quantified in Shreveport, LA and Grand Forks, ND . Isobutanol has been identified at levels ranging between 142 and 652 ppm in Hyashida River water, which contained effluents from the leather industsry. Isobutanol has also been identified as a constituent of petrochemical wastewater and palm mill effluents. Serious contamination of the groundwater 30 M below a paint factory was found to have resulted from leakage of solvent from underground storage tanks. Identification of isobutanol in the leachate from a model landfill suggests isobutanol may enter groundwater from landfill leachates. EFFL: Detected, not quantified in air over sedimentation tank of water treatment plant .

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