化合物详情

ATMOSPHERIC FATE: According to a suggested classification scheme(1), an estimated vapor pressure of 18 mm Hg at 25 °C(2,SRC) indicates that 2-methylpentaldehyde will exist in the vapor phase in the ambient atmosphere. Vapor-phase 2-methylpentaldehyde 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 about 13 hours(3,SRC).

The Koc of 2-methylpentaldehyde is estimated as approximately 44(SRC), using an experimental water solubility of 4200 mg/L at 25 °C(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that 2-methylpentaldehyde has very high mobility in soil(SRC).

An estimated BCF value of 5.6 was calculated for 2-methylpentaldehyde(SRC), using an experimental water solubility of 4200 mg/L at 25 °C(1) and a recommended regression-derived equation(2). According to a recommended classification scheme(3), this BCF value suggests that bioconcentration in aquatic organisms will not be an important fate process(SRC).

The Henry's Law constant for 2-methylpentaldehyde is estimated as 3.7X10-4 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This value indicates that 2-methylpentaldehyde will volatilize from water surfaces(2,SRC). 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) is estimated as approximately 5.3 hours(2,SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec) is estimated as approximately 4.7 days(2,SRC). 2-Methylpentaldehyde's vapor pressure, 17.9 mm Hg(3,SRC) and Henry's Law constant(1,SRC) indicate that volatilization from dry and moist soil may occur(SRC).

The rate constant for the vapor-phase reaction of 2-methylpentaldehyde with photochemically produced hydroxyl radicals has been estimated as 2.9X10-11 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1,SRC). This corresponds to an atmospheric half-life of about 13 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1,SRC).

SURFACE WATER: 2-Methylpentaldehyde was qualitatively detected in the sea near Holbaek, Denmark using blue mussel as an indicator organism(1).

2-Methylpentaldehyde has been tentatively identified as a volatile component of raw chicken breast muscle and caecum(1), fried bacon(2), and chicken, beef and pork meat(3).

2-Methylpentaldehyde is a volatile component in onion, garlic, milk, meat, and roasted peanuts(1).

2-Methylpentaldehyde's production and use as a flavoring ingredient(1) and an intermediate for dyes, resins, and pharmaceuticals(2) may result in its release to the environment through various waste streams(SRC).

The general population can be exposed to 2-methylpentaldehyde in foodstuffs based on its natural existence as a volatile component in onion, garlic, milk, meat, and roasted peanuts(1), its use as a flavoring ingredient(1), and through ingestion, inhalation, and dermal contact(SRC). Occupational exposure to aldehydes, such as 2-methylpentaldehyde(SRC), can occur through dermal contact, inhalation, and ingestion(2).

2-Methylpentaldehyde's production and use as a flavoring ingredient and an intermediate for dyes, resins, and pharmaceuticals may result in its release to the environment through various waste streams. 2-Methylpentaldehyde is a volatile component in onion, garlic, milk, meat, and roasted peanuts. 2-Methylpentaldehyde has also been found in sea water near Denmark. If released to soil, 2-methylpentaldehyde will have very high mobility. Volatilization of 2-methylpentaldehyde may be important from moist and dry soil surfaces. Insufficient experimetnal data are available to determine the rate or importance of biodegradation of 2-methylpentaldehyde in soil or water, but simple aldehydes are generally biodegradable. If released to water, 2-methylpentaldehyde may not adsorb to suspended solids...

LC (rat) > 1,500 ppm/6h

The mucus membranes of the nasal and oral passages and the upper respiratory tract are affected, producing a burning sensation ... bronchial constriction, choking, and coughing. The eyes tear, and a burning sensation is noted on the skin of the face. /Aldehydes/