cyclopentanol

H226 (100%): Flammable liquid and vapor [Warning Flammable liquids]

P210, P233, P240, P241, P242, P243, P280, P303+P361+P353, P370+P378, P403+P235, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 57 reports by companies from 3 notifications to the ECHA C&L Inventory.

Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.

H226: Flammable liquid and vapor [Warning Flammable liquids]

H301: Toxic if swallowed [Danger Acute toxicity, oral]

H310: Fatal in contact with skin [Danger Acute toxicity, dermal]

H319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]

H371: May cause damage to organs [Warning Specific target organ toxicity, single exposure]

P210, P233, P240, P241, P242, P243, P260, P262, P264, P264+P265, P270, P280, P301+P316, P302+P352, P303+P361+P353, P305+P351+P338, P308+P316, P316, P321, P330, P337+P317, P361+P364, P370+P378, P403+P235, P405, and P501 (click each P-code to see the statement)

Excerpt from ERG Guide 129 [Flammable Liquids (Water-Miscible / Noxious)]:

Refer to the "General First Aid" section. Specific First Aid: Wash skin with soap and water. In case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove clothing if adhering to skin. (ERG, 2024)

General First Aid:

· Call 911 or emergency medical service.

· Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.

· Move victim to fresh air if it can be done safely.

· Administer oxygen if breathing is difficult.

· If victim is not breathing:

-- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.

-- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).

-- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.

· Remove and isolate contaminated clothing and shoes.

· For minor skin contact, avoid spreading material on unaffected skin.

· In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.

· For severe burns, immediate medical attention is required.

· Effects of exposure (inhalation, ingestion, or skin contact) to substance may be delayed.

· Keep victim calm and warm.

· Keep victim under observation.

· For further assistance, contact your local Poison Control Center.

· Note: Basic Life Support (BLS) and Advanced Life Support (ALS) should be done by trained professionals.

Specific First Aid:

· Wash skin with soap and water.

· In case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove clothing if adhering to skin.

In Canada, an Emergency Response Assistance Plan (ERAP) may be required for this product. Please consult the shipping paper and/or the "ERAP" section.

Excerpt from ERG Guide 129 [Flammable Liquids (Water-Miscible / Noxious)]:

CAUTION: The majority of these products have a very low flash point. Use of water spray when fighting fire may be inefficient.

SMALL FIRE: Dry chemical, CO2, water spray or alcohol-resistant foam. Do not use dry chemical extinguishers to control fires involving nitromethane (UN1261) or nitroethane (UN2842).

LARGE FIRE: Water spray, fog or alcohol-resistant foam. Avoid aiming straight or solid streams directly onto the product. If it can be done safely, move undamaged containers away from the area around the fire.

FIRE INVOLVING TANKS, RAIL TANK CARS OR HIGHWAY TANKS: Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks in direct contact with flames. For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn. (ERG, 2024)

If material on fire or involved in fire: Do not extinguish fire unless flow can be stopped or safely confined. Use water in flooding quantities as fog. Solid streams of water may be ineffective. Use "alcohol" foam, dry chemical or carbon dioxide. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Keep run-off water out of sewers and water sources.

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· Keep unauthorized personnel away.

· Stay upwind, uphill and/or upstream.

· Ventilate closed spaces before entering, but only if properly trained and equipped.

· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.

· All equipment used when handling the product must be grounded.

· Do not touch or walk through spilled material.

· Stop leak if you can do it without risk.

· Prevent entry into waterways, sewers, basements or confined areas.

· A vapor-suppressing foam may be used to reduce vapors.

· Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers.

· Use clean, non-sparking tools to collect absorbed material.

Large Spill

· Dike far ahead of liquid spill for later disposal.

· Water spray may reduce vapor, but may not prevent ignition in closed spaces.

Excerpt from ERG Guide 129 [Flammable Liquids (Water-Miscible / Noxious)]:

IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area for at least 50 meters (150 feet) in all directions.

LARGE SPILL: Consider initial downwind evacuation for at least 300 meters (1000 feet).

FIRE: If tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2024)

Immediate precautionary measure

· Isolate spill or leak area for at least 50 meters (150 feet) in all directions.

· Consider initial downwind evacuation for at least 300 meters (1000 feet).

· If tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions.

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

If material not on fire and not involved in fire: Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard.

Personnel protection: Keep upwind. Avoid breathing vapors. ... Do not handle broken packages unless wearing appropriate personal protective equipment.

Excerpt from ERG Guide 129 [Flammable Liquids (Water-Miscible / Noxious)]:

ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. All equipment used when handling the product must be grounded. Do not touch or walk through spilled material. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. A vapor-suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean, non-sparking tools to collect absorbed material.

LARGE SPILL: Dike far ahead of liquid spill for later disposal. Water spray may reduce vapor, but may not prevent ignition in closed spaces. (ERG, 2024)

IN GENERAL, MATERIALS WHICH ARE TOXIC AS STORED OR WHICH CAN DECOMP INTO TOXIC COMPONENTS...SHOULD BE STORED IN COOL, WELL-VENTILATED PLACE, OUT OF DIRECT RAYS OF SUN, AWAY FROM AREAS OF HIGH FIRE HAZARD & SHOULD BE PERIODICALLY INSPECTED & MONITORED.

· Wear positive pressure self-contained breathing apparatus (SCBA).

· Structural firefighters' protective clothing provides thermal protection but only limited chemical protection.

CAUTION: The majority of these products have a very low flash point. Use of water spray when fighting fire may be inefficient.

Small Fire

· Dry chemical, CO2, water spray or alcohol-resistant foam.

· Do not use dry chemical extinguishers to control fires involving nitromethane (UN1261) or nitroethane (UN2842).

Large Fire

· Water spray, fog or alcohol-resistant foam.

· Avoid aiming straight or solid streams directly onto the product.

· If it can be done safely, move undamaged containers away from the area around the fire.

Fire Involving Tanks, Rail Tank Cars or Highway Tanks

· Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles.

· Cool containers with flooding quantities of water until well after fire is out.

· Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.

· ALWAYS stay away from tanks in direct contact with flames.

· For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn.

Excerpt from ERG Guide 129 [Flammable Liquids (Water-Miscible / Noxious)]:

Wear positive pressure self-contained breathing apparatus (SCBA). Structural firefighters' protective clothing provides thermal protection but only limited chemical protection. (ERG, 2024)

... Wear appropriate chemical protective gloves, boots and goggles. Wear positive pressure self-contained breathing apparatus. ...

Cyclopentanol appears as a colorless viscous liquid with a pleasant odor. Slightly less dense than water. Vapors heavier than air. Used to make perfumes and pharmaceuticals.

Colorless viscous liquid with a pleasant odor; [Hawley]

Colorless, viscous liquid

Odor of amyl alcohol, somewhat like peppermint

Pleasant odor

140.4 °C @ 760 MM HG

124 °F (NFPA, 2010)

124 °F (51 °C) (CLOSED CUP)

SOL IN ALCOHOL, ETHER, ACETONE; SLIGHTLY SOL IN WATER

Sparingly soluble in water. Soluble in ethanol.

0.9478 @ 20 °C/4 °C

2.97 (AIR= 1)

2.49 [mmHg]

1892 mm Hg @ 25 °C

log Kow = 0.71

INDEX OF REFRACTION: 1.4530 @ 20 °C; SADTLER REFERENCE NUMBER: 376 (IR, PRISM)

Boiling point

Chemical shift

Crystal structure

Diamagnetic susceptibility

Dielectric constant

Excess enthalpy

Formula unit

Formula weight

Fusion temperature

Heat of solution

Heat of sublimation

Lineshape

Magnetic susceptibility

Melting temperature

Mixing enthalpy

Optical coefficient

Phase diagram

Phase equilibrium

Phase transition

Refractive index

Space group

Surface tension

Transition enthalpy

Unit cell

Flammable. Soluble in water.

Alcohols and Polyols

CYCLOPENTANOL is an alcohol. Flammable and/or toxic gases are generated by the combination of alcohols with alkali metals, nitrides, and strong reducing agents. They react with oxoacids and carboxylic acids to form esters plus water. Oxidizing agents convert them to aldehydes or ketones. Alcohols exhibit both weak acid and weak base behavior. They may initiate the polymerization of isocyanates and epoxides.

Cyclopentanol

D*: Other compounds that may form peroxides

1 samples had 3 ppm peroxide; age >1 yrs

Management of time-sensitive chemicals (JCHAS)

Neurotoxin - Acute solvent syndrome

LIQUID ALICYCLIC HYDROCARBONS WILL DEHYDRATE & DELIPIDIZE SKIN ON REPEATED OR PROLONGED CONTACT & CAUSE DERMATITIS. DIRECT CONTACT...WITH LUNG TISSUE (ASPIRATION) WILL CAUSE PULMONARY EDEMA, PNEUMONITIS & HEMORRHAGE. VAPORS IN SUFFICIENT CONCN WILL CAUSE IRRITATION OF MUCOUS MEMBRANES. /ALICYCLIC HYDROCARBONS/

TOXICOLOGICALLY, THE ALICYCLIC HYDROCARBONS RESEMBLE THEIR OPEN CHAIN RELATIVES, THE ALIPHATIC HYDROCARBONS. IN GENERAL, THEY ARE ANESTHETICS & CNS DEPRESSANTS WITH A RELATIVLY LOW ORDER OF ACUTE TOXICITY. ...CUMULATIVE TOXICITY FROM REPEATED EXPOSURE TO LOW ATMOSPHERIC CONCN IS IMPROBABLE. /ALICYCLIC HYDROCARBONS/

Cyclopentanol (CAS # 96-41-3) was evaluated for acute oral toxicity. The test substance was administered by gavage to Wistar-derived male rats. Dosage and mortality data are as follows: 2.5 ml/kg (5/5); 1.25 ml/kg (5/5); and 0.625 ml/kg (5/6). Toxic signs included sluggish; unsteady gait; red fluid around eyes and mouth; and convulsions at 1.25 and 0.625 ml/kg. Gross pathology revealed mottled red and tan livers; distended and gas-filled stomachs; and pale kidneys.

Cyclopentanol (CAS # 96-41-3) was evaluated for acute dermal toxicity. The test substance was applied once to the clipped-intact skin of male New Zealand white rabbits for 24 hours. Dosages and mortality data are as follows: 1.60 ml/kg (2/2); 0.20 ml/kg (4/4); 0.10 ml/kg (0/4); and 0.05 ml/kg (0/2). The LD50 was determined to be 0.141 ml/kg. Toxic signs at 0.20 ml/kg and above, include erythema, edema, vocalization, hyperactivity, lacrimation and convulsions. Gross pathology revealed mottled red and light tan livers, and tan kidneys.

Cyclopentanol (CAS # 96-41-3) was evaluated for acute inhalation toxicity. The test substance was administered to 6 rats (strain and sex not indicated) per single exposure for 136 minutes (100% mortality) or 68 minutes (no mortalities) as a substantially saturated atmosphere at room temperature. LT50 was determined to be 96 minutes. Mortality resulted after a few hours. Toxic signs included lacrimation, hypoactivity, severe tremors, ataxia, salivation, dilated pupils, and coordination loss. Gross pathology revealed dark red lungs, and gas-filled stomach and intestines.

Cyclopentanol (CAS # 96-41-3) was evaluated for primary dermal irritation. The test substance was applied in 0.01 ml amounts to the clipped, uncovered intact skin of 5 rabbits (sex and strain not indicated), either undiluted or in dilutions of 10%, 1.0%, 0.1%, or 0.01% solvent. No irritation was noted on 4 rabbits, and moderate capillary injection was noted on one rabbit (Grade 2) at an unspecified concentration.

Cyclopentanol (CAS # 96-41-3) was evaluated for primary eye irritation. The test substance was applied to the conjunctival sac of 5 rabbits (sex and strain not indicated) at 0.005 ml, 0.02 ml, 0.10 ml, or 0.5 ml of undiluted or 0.5 ml of 40%, 15%, 5%, or 1% dilutions of test material. Moderate to severe corneal injury with iritis resulted from 0.005 ml of undiluted and 0.5 ml of 40% dilution of test material. No injury to minor corneal injury, with iritis in one rabbit, resulted from 15% dilution.

Cyclopentanol's production and use as a perfume and pharmaceutical solvent and as an intermediate for dyes, pharmaceuticals, and other organics may result in its release to the environment through various waste streams. If released to the atmosphere, cyclopentanol should mainly exist in the vapor phase based on a measured vapor pressure of 1892 mm Hg at 25 °C. Vapor-phase cyclopentanol is degraded in the atmosphere by reaction with photochemically produced hydroxyl radicals with an estimated half-life of about 1.5 days. An estimated Koc of 58 suggests that cyclopentanol will have high mobility in soil. Volatilization from dry soil surfaces is expected based on this compounds vapor pressure. Biodegradation is expected to be a major fate process for this compound in both soil and water. In a screening test using an activated sludge inoculum, 97% of the theoretical BOD was obtained within 5 days (cyclopentanol present at 100 mg/L). In water, cyclopentanol is not expected to adsorb to sediment or suspended matter. Bioconcentration in aquatic organisms is unlikely based on an estimated BCF value of 2. Cyclopentanol may volatilize from water and moist soil surfaces given an estimated Henry's Law constant of 2.6X10-6 atm-cu m/mole. Estimated half-lives for a model river and model lake are 13 and 98 days, respectively. (SRC)

Cyclopentanol's production and use as a perfume and pharmaceutical solvent and as an intermediate for dyes, pharmaceuticals, and other organics(1) may result in its release to the environment through various waste streams.

TERRESTRIAL FATE: Based on a recommended classification scheme(1), an estimated Koc value of 58(SRC), determined from a measured log Kow(2) and a recommended regression-derived equation(3), indicates that cyclopentanol will have high mobility in soil(SRC); leaching of this compound may be important under some environmental conditions(SRC). In soil, cyclopentanol is expected to readily biodegrade(SRC). In tests using activated sludge inocula, 95% of the inital COD (cyclopentanol at 200 mg/L COD), was removed over 120 hours(4); 97%(5) of the theoretical BOD was obtained within 5 days (cyclopentanol at 100 mg/L). Volatilization of cyclopentanol should be important from dry soil surfaces(SRC) given a measured vapor pressure of 1892 mm Hg at 25 °C(6). Volatilization from moist soil surfaces will be very slow(SRC) based on an estimated Henry's Law constant of 2.6X10-6 atm-cu m/mole(7,SRC).

AQUATIC FATE: Based on a recommended classification scheme(1), an estimated Koc value of 58(SRC), determined from an experimental log Kow(2) and a recommended regression-derived equation(3), indicates that cyclopentanol will not adsorb to suspended solids and sediment(SRC) in the water. Cyclopentanol is expected to readily biodegrade in water(SRC). In tests using activated sludge inocula, 95% of the inital COD (cyclopentanol at 200 mg/L COD), was removed over 120 hours(4); 97%(5) of the theoretical BOD was obtained within 5 days (cyclopentanol at 100 mg/L). Cyclopentanol will volatilize from water surfaces based on an estimated Henry's Law constant of 2.6X10-6 atm-cu m/mole(SRC), developed using a fragment constant estimation method(6). Estimated half-lives for a model river and model lake are 13 and 98 days, respectively(3,SRC). An estimated BCF value of 2(3,SRC), from a measured log Kow(2), suggests that cyclopentanol will bioconcentrate in aquatic organisms(SRC) according to a recommended classification scheme(7).

ATMOSPHERIC FATE: According to a suggested classification scheme(1), a measured vapor pressure of 1892 mm Hg at 25 °C(2) indicates that cyclopentanol will mainly exist in the vapor phase in the ambient atmosphere. Vapor-phase cyclopentanol 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 1.5 days(3,SRC).

Cyclopentanol, present at a COD of 200 mg/L, was readily biodegraded with 97% COD removal in 5 days using an adapted, activated sludge inoculum(1). A 5 day BOD test using a non-adapted sewage culture resulted in a BOD nearly 95% of the theoretical for cyclopentanol(2). Cyclopentanol at 100 mg/L had a BOD 53% of the theoretical after 24 hours, using a Warburg respirometer(2). Trichosporon cutaneum KUY-6A, a yeast strain isolated from a soil enrichment culture, was able to grow using cyclopentanol(3).

The rate constant for the vapor-phase reaction of cyclopentanol with photochemically produced hydroxyl radicals has been measured as 10.7X10-12 cu cm/molecule-sec at 25 °C(1). This corresponds to an atmospheric half-life of about 1.5 days at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1,SRC).

An estimated BCF value of 2 was calculated for cyclopentanol(SRC), using a measured log Kow of 0.71(1) and a recommended regression-derived equation(2). According to a classification scheme(3), this BCF value suggests that bioconcentration in aquatic organisms will not be low(SRC).

The Koc of cyclopentanol is estimated as approximately 58(SRC), using a measured log Kow of 0.71(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that cyclopentanol has high mobility in soil(SRC).

The Henry's Law constant for cyclopentanol is estimated as 2.6X10-6 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This value indicates that cyclopentanol 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 13 days(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 98 days(2,SRC). Cyclopentanol's high vapor pressure, 1892 mm Hg(3) indicates that volatilization from dry soil surfaces should occur(SRC); based on this compound's Henry's Law constant(1,SRC), significant volatilization from moist soil surfaces is not expected(SRC).

Cyclopentanol was detected in 10% of expired air samples taken from an urban population of humans(28 subjects, 224 expired air samples); the average concentration was 0.9 ng cyclopentanol/L expired air(1). 8.5% of 387 expired air samples from 54 human subjects contained cyclopentanol at an average concentration of 0.329 ng/L expired air(2).

Cyclopentanol is present, at unreported concentrations, as a volatile component of aroma for both beef and pork(1).

The general population may be exposed to cyclopentanol via inhalation of perfumes or the ingestion of foods containing this compound. Occupational exposure may occur through inhalation and dermal contact. (SRC)

Cyclopentanol's production and use as a perfume and pharmaceutical solvent and as an intermediate for dyes, pharmaceuticals, and other organics may result in its release to the environment through various waste streams. If released to the atmosphere, cyclopentanol should mainly exist in the vapor phase based on a measured vapor pressure of 1892 mm Hg at 25 °C. Vapor-phase cyclopentanol is degraded in the atmosphere by reaction with photochemically produced hydroxyl radicals with an estimated half-life of about 1.5 days. An estimated Koc of 58 suggests that cyclopentanol will have high mobility in soil. Volatilization from dry soil surfaces is expected based on this compounds vapor pressure. Biodegradation is expected to be a major fate process for this compound in both soil and water. In a screening test using an activated sludge inoculum, 97% of the theoretical BOD was obtained within 5 days (cyclopentanol present at 100 mg/L). In water, cyclopentanol is not expected to adsorb to sediment or suspended matter. Bioconcentration in aquatic organisms is unlikely based on an estimated BCF value of 2. Cyclopentanol may volatilize from water and moist soil surfaces given an estimated Henry's Law constant of 2.6X10-6 atm-cu m/mole. Estimated half-lives for a model river and model lake are 13 and 98 days, respectively. (SRC)

Cyclopentanol's production and use as a perfume and pharmaceutical solvent and as an intermediate for dyes, pharmaceuticals, and other organics(1) may result in its release to the environment through various waste streams.

TERRESTRIAL FATE: Based on a recommended classification scheme(1), an estimated Koc value of 58(SRC), determined from a measured log Kow(2) and a recommended regression-derived equation(3), indicates that cyclopentanol will have high mobility in soil(SRC); leaching of this compound may be important under some environmental conditions(SRC). In soil, cyclopentanol is expected to readily biodegrade(SRC). In tests using activated sludge inocula, 95% of the inital COD (cyclopentanol at 200 mg/L COD), was removed over 120 hours(4); 97%(5) of the theoretical BOD was obtained within 5 days (cyclopentanol at 100 mg/L). Volatilization of cyclopentanol should be important from dry soil surfaces(SRC) given a measured vapor pressure of 1892 mm Hg at 25 °C(6). Volatilization from moist soil surfaces will be very slow(SRC) based on an estimated Henry's Law constant of 2.6X10-6 atm-cu m/mole(7,SRC).

AQUATIC FATE: Based on a recommended classification scheme(1), an estimated Koc value of 58(SRC), determined from an experimental log Kow(2) and a recommended regression-derived equation(3), indicates that cyclopentanol will not adsorb to suspended solids and sediment(SRC) in the water. Cyclopentanol is expected to readily biodegrade in water(SRC). In tests using activated sludge inocula, 95% of the inital COD (cyclopentanol at 200 mg/L COD), was removed over 120 hours(4); 97%(5) of the theoretical BOD was obtained within 5 days (cyclopentanol at 100 mg/L). Cyclopentanol will volatilize from water surfaces based on an estimated Henry's Law constant of 2.6X10-6 atm-cu m/mole(SRC), developed using a fragment constant estimation method(6). Estimated half-lives for a model river and model lake are 13 and 98 days, respectively(3,SRC). An estimated BCF value of 2(3,SRC), from a measured log Kow(2), suggests that cyclopentanol will bioconcentrate in aquatic organisms(SRC) according to a recommended classification scheme(7).

ATMOSPHERIC FATE: According to a suggested classification scheme(1), a measured vapor pressure of 1892 mm Hg at 25 °C(2) indicates that cyclopentanol will mainly exist in the vapor phase in the ambient atmosphere. Vapor-phase cyclopentanol 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 1.5 days(3,SRC).

Cyclopentanol, present at a COD of 200 mg/L, was readily biodegraded with 97% COD removal in 5 days using an adapted, activated sludge inoculum(1). A 5 day BOD test using a non-adapted sewage culture resulted in a BOD nearly 95% of the theoretical for cyclopentanol(2). Cyclopentanol at 100 mg/L had a BOD 53% of the theoretical after 24 hours, using a Warburg respirometer(2). Trichosporon cutaneum KUY-6A, a yeast strain isolated from a soil enrichment culture, was able to grow using cyclopentanol(3).

The rate constant for the vapor-phase reaction of cyclopentanol with photochemically produced hydroxyl radicals has been measured as 10.7X10-12 cu cm/molecule-sec at 25 °C(1). This corresponds to an atmospheric half-life of about 1.5 days at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1,SRC).

An estimated BCF value of 2 was calculated for cyclopentanol(SRC), using a measured log Kow of 0.71(1) and a recommended regression-derived equation(2). According to a classification scheme(3), this BCF value suggests that bioconcentration in aquatic organisms will not be low(SRC).

The Koc of cyclopentanol is estimated as approximately 58(SRC), using a measured log Kow of 0.71(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that cyclopentanol has high mobility in soil(SRC).

The Henry's Law constant for cyclopentanol is estimated as 2.6X10-6 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This value indicates that cyclopentanol 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 13 days(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 98 days(2,SRC). Cyclopentanol's high vapor pressure, 1892 mm Hg(3) indicates that volatilization from dry soil surfaces should occur(SRC); based on this compound's Henry's Law constant(1,SRC), significant volatilization from moist soil surfaces is not expected(SRC).

Cyclopentanol was detected in 10% of expired air samples taken from an urban population of humans(28 subjects, 224 expired air samples); the average concentration was 0.9 ng cyclopentanol/L expired air(1). 8.5% of 387 expired air samples from 54 human subjects contained cyclopentanol at an average concentration of 0.329 ng/L expired air(2).

Cyclopentanol is present, at unreported concentrations, as a volatile component of aroma for both beef and pork(1).

The general population may be exposed to cyclopentanol via inhalation of perfumes or the ingestion of foods containing this compound. Occupational exposure may occur through inhalation and dermal contact. (SRC)

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

/GUIDE 129: FLAMMABLE LIQUIDS (Polar/Water-Miscible/Noxious)/ Fire or Explosion: HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

/GUIDE 129: FLAMMABLE LIQUIDS (Polar/Water-Miscible/Noxious)/ Health: May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

/GUIDE 129: FLAMMABLE LIQUIDS (Polar/Water-Miscible/Noxious)/ Public Safety: CALL Emergency Response Telephone Number on Shipping Paper first. If Shipping Paper not available or no answer, refer to appropriate telephone number listed on the inside back cover. As an immediate precautionary measure, isolate spill or leak area for at least 50 meters (150 feet) in all directions. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate closed spaces before entering.

/GUIDE 129: FLAMMABLE LIQUIDS (Polar/Water-Miscible/Noxious)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Structural firefighters' protective clothing will only provide limited protection.

For more DOT Emergency Guidelines (Complete) data for CYCLOPENTANOL (8 total), please visit the HSDB record page.

UN 2244; Cyclopentanol

IMO 3.3; Cyclopentanol

No person may /transport,/ offer or accept a hazardous material for transportation in commerce unless that person is registered in conformance ... and the hazardous material is properly classed, described, packaged, marked, labeled, and in condition for shipment as required or authorized by ... /the hazardous materials regulations (49 CFR 171-177)./

The International Air Transport Association (IATA) Dangerous Goods Regulations are published by the IATA Dangerous Goods Board pursuant to IATA Resolutions 618 and 619 and constitute a manual of industry carrier regulations to be followed by all IATA Member airlines when transporting hazardous materials.

The International Maritime Dangerous Goods Code lays down basic principles for transporting hazardous chemicals. Detailed recommendations for individual substances and a number of recommendations for good practice are included in the classes dealing with such substances. A general index of technical names has also been compiled. This index should always be consulted when attempting to locate the appropriate procedures to be used when shipping any substance or article.

Flammable Liquid