3,3-Dimethylbutanon

Use water spray to cool unopened containers.

Wear self contained breathing apparatus for fire fighting if necessary.

For small (incipient) fires, use media such as "alcohol" foam, dry chemical, or carbon dioxide. For large fires, apply water from as far as possible. Use very large quantities (flooding) of water applied as a mist or spray; solid streams of water may be ineffective. Cool all affected containers with flooding quantities of water.

Contain spillage, and then collect with an electrically protected vacuum cleaner or by wet-brushing and place in container for disposal according to local regulations.

Environmental precautions: Prevent further leakage or spillage if safe to do so. Do not let product enter drains. Discharge into the environment must be avoided.

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

Burn in a chemical incinerator equipped with an afterburner and scrubber but exert extra care in igniting as this material is highly flammable. Offer surplus and non-recyclable solutions to a licensed disposal company. Contact a licensed professional waste disposal service to dispose of this material.

Avoid contact with skin and eyes. Avoid inhalation of vapor or mist. Use explosion-proof equipment. Keep away from sources of ignition. No smoking. Take measures to prevent the build up of electrostatic charge.

ACCIDENTAL RELEASE MEASURES Personal precautions: Use personal protective equipment. Avoid breathing vapors, mist or gas. Ensure adequate ventilation. Remove all sources of ignition. Evacuate personnel to safe areas. Beware of vapors accumulating to form explosive concentrations. Vapors can accumulate in low areas.

Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique (without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands.

Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.

1.8 [mg/m3]

20 [mg/m3]

120 [mg/m3]

Complete suit protecting against chemicals, Flame retardant antistatic protective clothing, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.

Face shield and safety glasses Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

Where risk assessment shows air-purifying respirators are appropriate use a full-face respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. If the respirator is the sole means of protection, use a full-face supplied air respirator. Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).

In an analysis of expired human air collected from 28 normal, healthy, non-smoking humans, 3,3-dimethyl-2-butanone was detected at concns ranging from approximately 0.12 to 2 ng/L of expired air(1); positive identifactions of 3,3-dimethyl-2-butanone were made in approximately 10% of all samples. In a similar study of 54 humans (387 expired air samples collected), 3,3-dimethyl-2-butanone was detected in 8.3% of all samples with a mean concn of 0.184 ng/L(2).

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 110(SRC), determined from a log Kow of 1.2(2) and a regression-derived equation(3), indicates that 3,3-dimethyl-2-butanone is expected to have high mobility in soil(SRC). Volatilization of 3,3-dimethyl-2-butanone from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 2.2X10-4 atm-cu m/mole(SRC), derived from its vapor pressure, 31.5 mm Hg(4), and water solubility, 19,000 mg/L(5). 3,3-Dimethyl-2-butanone is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(4). Biodegradation data were not available(SRC, 2007).

AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 110(SRC), determined from a log Kow of 1.2(2) and a regression-derived equation(3), indicates that 3,3-dimethyl-2-butanone is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 2.2X10-4 atm-cu m/mole(SRC), derived from its vapor pressure, 31.5 mm Hg(4), and water solubility, 19,000 mg/L(5). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 7 hours and 5.2 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 2(SRC), from its log Kow(2) and a regression-derived equation(7), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Biodegradation data were not available(SRC, 2007).

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 3,3-dimethyl-2-butanone, which has a vapor pressure of 31.5 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase 3,3-dimethyl-2-butanone is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 14 days(SRC), calculated from its rate constant of 1.21X10-12 cu cm/molecule-sec at 25 °C(3). 3,3-Dimethyl-2-butanone contains chromophores that absorb at wavelengths >290 nm and therefore may be susceptible to direct photolysis by sunlight(4).

In an analysis of 63 chemical manufacturing effluent discharges collected from across the US, 3,3-dimethyl-2-butanone was detected in one effluent at a concn of <10 ug/L(1). It has been reported that 3,3-dimethyl-2-butanone can be released to the atmosphere through auto emissions and solvents(2).

The Koc of 3,3-dimethyl-2-butanone is estimated as 110(SRC), using a log Kow of 1.2(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that 3,3-dimethyl-2-butanone is expected to have high mobility in soil.

An estimated BCF of 2 was calculated in fish for 3,3-dimethyl-2-butanone(SRC), using a log Kow of 1.2(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC).

The Henry's Law constant for 3,3-dimethyl-2-butanone is estimated as 2.2X10-4 atm-cu m/mole(SRC) derived from its vapor pressure, 31.5 mm Hg(1), and water solubility, 19,000 mg/L(2). This Henry's Law constant indicates that 3,3-dimethyl-2-butanone is expected to volatilize from water surfaces(3). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(3) is estimated as 7 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(3) is estimated as 5.2 days(SRC). 3,3-Dimethyl-2-butanone's estimated Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). The potential for volatilization of 3,3-dimethyl-2-butanone from dry soil surfaces may exist(SRC) based upon its vapor pressure(1).

/LABORATORY ANIMALS: Acute Exposure/ Sprague-Dawley rats were given 15, 70 and 140 min exposures to 15 mg/L 3,3-dimethyl-2-butanol, pinacolyl alcohol (PA), or 6-hour exposures to 0.2, 1.0 and 5.0 mg/L PA (1 mg/L = 240 ppm). A 50% mortality rate was obtained at the longest exposure to 15 mg/L. Sex related differences in the blood levels of PA and pinacolone were noted, and the surviving male rats failed to gain weight normally in the first week after exposure. In rats exposed to 5.0 mg/L for 6 hours, there were reductions in horizontal and vertical activity and the minute volume was 55% of controls at the end of exposure. Like many secondary alcohols, PA poses only a possible inhalation hazard; however, male rats may be somewhat more susceptible than females. /Pinacolyl alcohol/

/ALTERNATIVE and IN VITRO TESTS/ Following the pretreatment of guinea pigs with 90% LD50 soman, enhancement of microsomal esterase activity was noted 12 and 24 hr after pretreatment. Using Michaelis-Menten enzyme kinetic studies, enhancement was found to occur with liver carboxylesterase and procaine esterase, but not with aniline hydroxylase. Since the soman-enzyme complex was known to undergo aging with the release of pinacolyl alcohol and the subsequent formation of pinacolone, the effects of these metabolites on the activity of liver microsomal enzymes in vitro were explored. Pinacolone and pinacolyl alcohol produced enzyme enhancement in vitro in a manner similar to that produced by soman pretreatment. These effects were compared with those made by acetone in the same incubations, since the enhancing influence of acetone has already been well documented. Similarity was found between the in vitro effects of acetone and the effects of pinacolone and pinacolyl alcohol. Lastly, the in vivo effects of pinacolone on the activities of the same liver microsomal enzymes were studied following pretreatment of the guinea pigs with 90% LDLo (lowest published lethal dose) pinacolone. Pretreating guinea pigs with pinacolone prior to killing them enhanced liver microsomal carboxylesterase and procaine esterase activities, but had no effect on microsomal aniline hydroxylase activity. This pattern of enzyme enhancement was similar to that observed after soman pretreatment. Therefore, soman was found to enhance hepatic microsomal esterase activity in the guinea pig in a manner similar to that seen with its metabolites, as well as acetone. ...

The rate constant for the vapor-phase reaction of 3,3-dimethyl-2-butanone with photochemically-produced hydroxyl radicals has been measured as 1.21X10-12 cu cm/molecule-sec at 25 °C(1). This corresponds to an atmospheric half-life of about 14 days at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1). 3,3-Dimethyl-2-butanone is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyze under environmental conditions(2). 3,3-Dimethyl-2-butanone contains chromophores that absorb at wavelengths >290 nm and therefore may be susceptible to direct photolysis by sunlight(2).