4-Methylbenzaldehyde

120.15

120.15

385772

203-246-9

GAX22QZ28Q

2224

DTXSID9041520

COLORLESS LIQUID

2912299000

17.1

2.1

Clear colorless to yellow Liquid

1.0194 g/cm³ @ Temp: 17 °C

-6 °C

204 °C @ Press: 760 Torr

176 °F

1.558

water: soluble 0.25 g/L at 25°C

Store below +30°C.

2.5X10-1 mm Hg at 25 deg C

0.9-5.6%(V)

Floral odor

Henry's Law constant = 1.74X10-5 atm-cu m/mol at 25 °C (est)

Liquid Molar Volume = 0.119047 cu m/kmol|Hydroxyl radical reaction rate constant = 1./87X10-11 cu cm/molec-sec at 25 °C (est)

I; II; III

NA 1993 / PGIII

1

22-36/37/38-36/38

26-36-37/39

CU7034500

Xn

Stable under normal temperatures and pressures.

P261-P305 + P351 + P338

H302-H315-H319-H335

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.

|Warning|H302 (99.78%): Harmful if swallowed [Warning Acute toxicity, oral]|P264, P270, P280, P301+P312, P305+P351+P338, P330, P337+P313, and P501|Aggregated GHS information provided by 1791 companies from 8 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|H227: Combustible liquid [Warning Flammable liquids]|P210, P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P370+P378, P403+P233, P403+P235, P405, and P501

SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.

The low molecular weight aldehydes, the halogenated aliphatic aldehydes, and the unsaturated aldehydes are particularly irritating. /Aldehydes/

Operation of a four-stroke outboard motor resulted in the exhaust emission of 2.8 mg/10 min of 4-methylbenzaldehyde into the water(1). 4-Methylbenzaldehyde was emitted from a fireplace burning jack pine, cedar, red oak, and green ash wood at concns of 0.114-0.475 g/kg(2). 4-Methylbenzaldehyde was emitted from non-catalyst and catalyst automobiles at 7.7 and 1.7 ug/km, respectively(3). Heavy-duty diesel trucks emitted 2.3 ug 4-methylbenzaldehyde/km(3). 4-Methylbenzaldehyde was identified in rush hour traffic air samples taken at the Oakland-San Francisco Bay Bridge toll plaza 4/23/2001, 5-7 pm, 4/24/2001, 6-10 am, and 3-7 pm at concns of 0.018-0.023 ug/cu m(4). 4-Methylbenzaldehyde was found in highway tunnels in Tuscarora; light duty trucks emitted 0.023 mg/km traveled or 0.305 mg/L fuel used, heavy duty trucks emitted 0.335 mg/km traveled or 0.962 mg/L fuel used(5). 4-Methylbenzaldehyde emissions from an automobile running on Swedish environmental classified diesel fuel were 0.6 mg/km and the same automobile running on European program emissions fuel were also 0.6 mg/km(6).|3-Methylbenzaldehyde/4-methylbenzaldehyde was measured in the emissions of burnt wood at 12 and 27 mg/kg of pine and eucalyptus, but was not detected in the emissions of burnt oak(1).

URBAN/SUBURBAN: 4-Methylbenzaldehyde, analyzed in Athens, Greece, June to December 2000, was detected at Patission Street at concns of 1.2-5.9 ug/cu m(1). 4-Methylbenzaldehyde was detected at average concns of 0.032-0.131 ug/cu m in Rio de Janeiro, Brazil Oct 1999 to Nov 2000(2). 4-Methylbenzaldehyde was analyzed but not detected in samples taken at the top of an 11 story building on the campus of Hong Kong University Science and Technology(3).|RURAL/REMOTE: 4-Methylbenzaldehyde was identified in forest air collected in the Southern Black Forest, Germany, at unreported concentrations(1).|SOURCE DOMINATED: 4-Methylbenzaldehyde was analyzed but not detected in kitchen exhaust(1).

4-Methylbenzaldehyde was measured in tire wear particles and brake lining particles at concns of 2.3 and 0.30 ug/g sample, respectively, and was not detected in samples of road dust particles(1).

LD50 Mouse ip 400 mg/kg|LD50 Mouse oral 3200 mg/kg|LD50 Rat ip 800 mg/kg|LD50 Rat oral 1600 mg/kg

4-Methylbenzaldehyde was detected in raw earth almonds (Cyperus esculentus L.)(1).

4-Methylbenzaldehyde's production and use in perfumes, as a pharmaceutical and dyestuff intermediate, and as a flavoring agent(1) may result in its release to the environment through various waste streams(SRC). Exhaust from outboard motors(2), automobiles and trucks(3), and emissions from fireplaces(4) contain 4-methylbenzaldehyde.

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 62(SRC), determined from a water solubility of 2,270 mg/L(2) and a regression-derived equation(3), indicates that 4-methylbenzaldehyde is expected to have high mobility in soil(SRC). Volatilization of 4-methylbenzaldehyde from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 1.7X10-5 atm-cu m/mole(SRC), derived from its vapor pressure, 0.25 mm Hg(4), and its water solubility(2). 4-Methylbenzaldehyde is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(4). Based on limited information, 4-methylbenzaldehyde is expected to biodegrade in soil(SRC). A Pseudomonas strain was able to utilize 4-methylbenzaldehyde as the sole carbon source(5); a yeast strain grown with both this compound and either sucrose or pyruvate biodegraded 4-methylbenzaldehyde to the respective aromatic carbinol or alcohol(6).|AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 62(SRC), determined from a water solubility of 2,270 mg/L(2) and a regression-derived equation(3), indicates that 4-methylbenzaldehyde 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 1.7X10-5 atm-cu m/mole(SRC), derived from its vapor pressure, 0.25 mm Hg(4), and its water solubility(2). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 2.4 and 21 days, respectively(SRC). According to a classification scheme(5), an estimated BCF of 8(SRC), from its water solubility(2) and a regression-derived equation(3), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Based on limited data, biodegradation of 4-methylbenzaldehyde will take place in water(SRC). A Pseudomonas strain was able to utilize 4-methylbenzaldehyde as the sole carbon source(6); a yeast strain grown with both this compound and either sucrose or pyruvate biodegraded 4-methylbenzaldehyde to the respective aromatic carbinol or alcohol(7).|ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 4-methylbenzaldehyde, which has a vapor pressure of 0.25 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase 4-methylbenzaldehyde 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 21 hrs(SRC), calculated from its rate constant of 1.8X10-11 cu cm/molecule-sec at 25 °C(3). The reactivity of 4-methylbenzaldehyde (1 ppm) with NOx (0.5 ppm) in light was measured in a smog chamber as 1.78 ppb/min(4). 4-Methylbenzaldehyde contains chromophores that absorb at wavelengths >290 nm(5) and therefore may be susceptible to direct photolysis by sunlight(SRC).

The rate constant for the vapor-phase reaction of 4-methylbenzaldehyde with photochemically-produced hydroxyl radicals has been measured as 1.8X10-11 cu cm/molecule-sec at 25 °C(1). This corresponds to an atmospheric half-life of about 21 hrs at an atmospheric concn of 5X10+5 hydroxyl radicals per cu cm(1). The reactivity of 4-methylbenzaldehyde was measured using the smog chamber method where the aldehyde is irradiated in a mixture with nitric oxide and air; the reactivity of 1 ppm of 4-methylbenzaldehyde with 0.5 ppm of NOx was measured as 1.78 ppb/min(2). 4-Methylbenzaldehyde is not expected to undergo hydrolysis in the environment due to the lack of functional groups that hydrolyze under environmental conditions(3). 4-Methylbenzaldehyde contains chromophores that absorb at wavelengths >290 nm(3) and therefore may be susceptible to direct photolysis by sunlight(SRC).

An estimated BCF of 8 was calculated in fish for 4-methylbenzaldehyde(SRC), using a water solubility of 2,270 mg/L(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 Koc of 4-methylbenzaldehyde is estimated as 62(SRC), using a water solubility of 2,270 mg/L(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that 4-methylbenzaldehyde is expected to have high mobility in soil.

The Henry's Law constant for 4-methylbenzaldehyde is estimated as 1.7X10-5 atm-cu m/mole(SRC), derived from its vapor pressure, 0.25 mm Hg(1), and water solubility, 2270 mg/L(2). This Henry's Law constant indicates that 4-methylbenzaldehyde 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 2.4 days(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 21 days(SRC). 4-Methylbenzaldehyde's estimated Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). 4-Methylbenzaldehyde is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).

4-Methylbenzaldehyde is a constituent of coffee aroma(1), roasted filberts(2), roasted earth almonds (Cyperus esculentus L.)(3). 4-Methylbenzaldehyde was detected in a Spanish type paprika oleoresin at 1.3 mg/kg(4).

NIOSH (NOES Survey 1981-1983) has statistically estimated that 12,495 workers (8505 of these were female) were potentially exposed to 4-methylbenzaldehyde in the US(1). Occupational exposure to 4-methylbenzaldehyde may occur through inhalation and dermal contact with this compound at workplaces where 4-methylbenzaldehyde is produced or used. Monitoring data and use information indicate that the general population may be exposed to 4-methylbenzaldehyde via inhalation of ambient air, ingestion of food and dermal contact with this compound(SRC).

p-Methylbenzaldehyde was detected in expired air at an average concentration of 6.5 ng/L from 28 human subjects(1). 5.6% of expired air samples from 54 human subjects contained 4-methylbenzaldehyde at a mean concentration of 3.3 ng/L(2).

Aromatic aldehydes are oxidized in vivo almost entirely to corresponding acid. Thus, in rabbits, p-tolualdehyde is converted to p-toluic acid which has been detected in urine as the ester glucuronide.|p-Tolualdehyde was oxidized to p-toluic acid by resting cells of pseudomonas aeruginosa. Perillaldehyde dehydrogenase, isolated from soil pseudomonad, catalyzed the oxidn of m- & p-tolualdehyde but not o-tolualdehyde.|Aldehydes are readily oxidized to organic acids. Oxidation of aldehydes is catalyzed by aldehyde dehydrogenase, which has been found in the brain, erythrocytes, liver, kidney, heart, and placenta. /Aldehydes/|... The detoxification of aldehydes can be seen to proceed basically via two routes: (1) an oxidation to yield readily metabolized acids; (2) inactivation by reaction with sulfhydryl groups, particularly glutathione. Under conditions that either deplete glutathione levels, or that result in an inhibition of aldehyde dehydrogenase (for example, Antabuse treatment), the acute and chronic effects of aldehyde toxicity might be more fully expressed. /Aldehydes/|For more Metabolism/Metabolites (Complete) data for 4-METHYLBENZALDEHYDE (7 total), please visit the HSDB record page.

/SRP:/ Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand-valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR as necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Aldehydes and Related Compounds/|/SRP:/ Basic treatment: Establish a patent airway (oropharyngeal or nasopharyngeal airway, if needed). Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Aggressive airway management may be necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Anticipate seizures and treat if necessary ... . Monitor for shock and treat if necessary ... . Monitor for pulmonary edema and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with 0.9% saline (NS) during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool. Administer activated charcoal ... . /Aldehydes and Related Compounds/|/SRP:/ Advanced treatment: Consider Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in severe respiratory distress. Intubation should be considered at the first sign of upper airway obstruction caused by edema. Positive-pressure ventilation techniques with a bag valve mask device may be beneficial. Consider drug therapy for pulmonary edema ... . Consider administering a beta agonist such as albuterol for severe bronchospasm ... . Start IV administration of D5W /SRP: "To keep open", minimal flow rate/. Use 0.9% saline (NS) or lactated Ringer's (LR) if signs of hypovolemia are present. For hypotension with signs of hypovolemia, administer fluid cautiously. Consider vasopressors if patient is hypotensive with a normal fluid volume. Watch for signs of fluid overload ... . Treat seizures with diazepam or lorazepam ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Aldehydes and Related Compounds/

/SIGNS AND SYMPTOMS/ 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/|/SIGNS AND SYMPTOMS/ No evidence of skin sensitization was found in volunteers treated with dilute solutions. /Tolualdehydes/

4-methylbenzaldehyde

Grades: Technical; Pure.

All other basic organic chemical manufacturing|Benzaldehyde, 4-methyl-: ACTIVE

THE TOLUALDEHYDES, O-, M-, & P-TOLUALDEHYDE WERE DETECTED IN EXHAUST GASES BY GAS CHROMATOGRAPHY. MINIMUM DETECTABLE ALDEHYDES WERE 0.01 UG.|ALDEHYDES IN AIR SAMPLES WERE REACTED WITH 2,4-DINITROPHENYLHYDRAZINE TO FORM 2,4-DINITROPHENYLHYDRAZONE DERIVATIVES. THE DERIVATIVES WERE EXTRACTED WITH CHLOROFORM & CONCENTRATED. THE RESIDUE IN ACETONITRILE WAS ANALYZED BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY.|Method #IP-6A. Determination of Formaldehyde and Other Aldehydes in Indoor Air Using a Solid Adsorbent Cartridge. Detection limit = 0.010 ppb.|Method #IP-6B. Determination of Formaldehyde and Other Aldehyders in Indoor Air Using a Continuous Colorimetric Analyzer. Detection limit = 0.030 ppb.|For more Analytic Laboratory Methods (Complete) data for 4-METHYLBENZALDEHYDE (9 total), please visit the HSDB record page.

Food additives -> Flavoring Agents

Flavoring Agents