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Vinyl bromide(CAS No. 593-60-2)

Vinyl bromide C2H3Br (cas 593-60-2) Molecular Structure

593-60-2 Structure

Identification and Related Records

【Name】
Vinyl bromide
【CAS Registry number】
593-60-2
【Synonyms】
Bromoethylene
【EINECS(EC#)】
209-800-6
【Molecular Formula】
C2H3Br (Products with the same molecular formula)
【Molecular Weight】
106.95
【Inchi】
InChI=1/C2H3Br/c1-2-3/h2H,1H2
【Canonical SMILES】
C=CBr
【MOL File】
593-60-2.mol

Chemical and Physical Properties

【Appearance】
colorless gas
【Density】
1.4933
【Melting Point】
-139℃
【Boiling Point】
16℃
【Refractive Index】
n20/D 1.410
【Flash Point】
5℃
【Water】
insoluble
【Solubilities】
insoluble
【Color/Form】
Gas under normal atmospheric conditions, colorless liquid under pressure
Colorless gas or liquid (below 60 degrees F) [Note: Shipped as a liquefied compressed gas with 0.1% phenol added to prevent polymerization].
【Stability】
Stable, but may polymerize in sunlight. Reacts violently with all types of oxidizer. Incompatible with strong oxidizing agents, peroxides, copper, copper alloys, plastics. Highly flammable.
【Storage temp】
2-8°C
【Spectral properties】
Index of refraction: 1.4380 @ 20 deg C
IR: 6435 (Documentation of Molecular Spectroscopy Collection)
MASS: 20069 (NIST/EPA/MSDC Mass Spectral Database 1990 Version); 734 (Atlas of Mass Spectral Data, J Wiley and Sons, NY)
【Computed Properties】
Molecular Weight:106.94922 [g/mol]
Molecular Formula:C2H3Br
XLogP3-AA:1.5
H-Bond Donor:0
H-Bond Acceptor:0
Rotatable Bond Count:0
Exact Mass:105.941813
MonoIsotopic Mass:105.941813
Topological Polar Surface Area:0
Heavy Atom Count:3
Formal Charge:0
Complexity:10.3
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:1
Feature 3D Hydrophobe Count:1
Effective Rotor Count:0
Conformer Sampling RMSD:0.4
CID Conformer Count:1

Safety and Handling

【Hazard Codes】
F+:Highlyflammable;T:Toxic;
【Risk Statements】
R45;R12
【Safety Statements 】
S53;S45
【HazardClass】
2.1
【PackingGroup 】
O52
【Skin, Eye, and Respiratory Irritations】
The liquid irritates the eyes and may irritate the skin by its defatting action.
【Cleanup Methods】
PRECAUTIONS FOR "CARCINOGENS": A high-efficiency particulate arrestor (HEPA) or charcoal filters can be used to minimize amt of carcinogen in exhausted air ventilated safety cabinets, lab hoods, glove boxes or animal rooms ... Filter housing that is designed so that used filters can be transferred into plastic bag without contaminating maintenance staff is avail commercially. Filters should be placed in plastic bags immediately after removal ... The plastic bag should be sealed immediately ... The sealed bag should be labelled properly ... Waste liquids ... should be placed or collected in proper containers for disposal. The lid should be secured & the bottles properly labelled. Once filled, bottles should be placed in plastic bag, so that outer surface ... is not contaminated ... The plastic bag should also be sealed & labelled. ... Broken glassware ... should be decontaminated by solvent extraction, by chemical destruction, or in specially designed incinerators. /Chemical Carcinogens/
【Transport】
UN 1085
【Fire Fighting Procedures】
TO FIGHT FIRE, USE /CARBON DIOXIDE/, DRY CHEMICAL, OR WATER SPRAY.
If material on fire or involved in fire: Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. 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.
Evacuation: If fire becomes uncontrollable or container is exposed to direct flame - consider evacuation of one-half (1/2) mile radius.
【Fire Potential】
A VERY DANGEROUS FIRE HAZARD WHEN EXPOSED TO HEAT OR FLAME.
Highly flammable
【Formulations/Preparations】
VINYL BROMIDE CONTENT 99.8 WT% MIN, MEHQ (METHYL ETHYL HYDROQUINONE) AS INHIBITOR - 175-225 PPM
WATER, 100 PPM MAX.; NON-VOLATILE MATTER, (INCLUDING INHIBITOR) 500 PPM MAX /POLYMERIZATION GRADE/
【DOT Emergency Guidelines】
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Fire or Explosion: EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. ... Those substances designated with a "P" may polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Health: Vapors may cause dizziness or asphyxiation without warning. Some may be toxic if inhaled at high concentrations. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating and/or toxic gases. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Public Safety: CALL Emergency Response Telephone Number ... . As an immediate precautionary measure, isolate spill or leak area for at least 100 meters (330 feet) in all directions. Keep unauthorized personnel away. Stay upwind. Many gases are heavier than air and will spread along ground and collect in low or confined areas (sewers, basements, tanks). Keep out of low areas. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Structural firefighters' protective clothing will only provide limited protection. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Evacuation: Large spill: Consider initial downwind evacuation for at least 800 meters (1/2 mile). Fire: If tank, rail car or tank truck is involved in a fire, ISOLATE for 1600 meters (1 mile) in all directions; also, consider initial evacuation for 1600 meters (1 mile) in all directions. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Fire: DO NOT EXTINGUISH A LEAKING GAS FIRE UNLESS LEAK CAN BE STOPPED. Small fires: Dry chemical or CO2. Large fires: Water spray or fog. Move containers from fire area if you can do it without risk. Fire involving tanks: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. Do not direct water at source of leak or safety devices; icing may occur. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles, if this is impossible, withdraw from area and let fire burn. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ Spill or Leak: ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). All equipment used when handling the product must be grounded. Stop leak if you can do it without risk. Do not touch or walk through spilled material. Do not direct water at spill or source of leak. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. If possible, turn leaking containers so that gas escapes rather than liquid. Prevent entry into waterways, sewers, basements or confined areas. Isolate area until gas has dispersed. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
/GUIDE 116P: GASES - FLAMMABLE (UNSTABLE)/ First Aid: Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with liquefied gas, thaw frosted parts with lukewarm 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. Keep victim warm and quiet. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. /Vinyl bromide, inhibited; Vinyl bromide, stabilized/
【Reactivities and Incompatibilities】
... Reacts violently with oxidants ... .
Strong oxidizers [Note: May polymerize in sunlight.]
【Other Preventative Measures】
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.
PRECAUTIONS FOR "CARCINOGENS": Smoking, drinking, eating, storage of food or of food & beverage containers or utensils, & the application of cosmetics should be prohibited in any laboratory. All personnel should remove gloves, if worn, after completion of procedures in which carcinogens have been used. They should ... wash ... hands, preferably using dispensers of liq detergent, & rinse ... thoroughly. Consideration should be given to appropriate methods for cleaning the skin, depending on nature of the contaminant. No standard procedure can be recommended, but the use of organic solvents should be avoided. Safety pipettes should be used for all pipetting. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": In animal laboratory, personnel should remove their outdoor clothes & wear protective suits (preferably disposable, one-piece & close-fitting at ankles & wrists), gloves, hair covering & overshoes. ... clothing should be changed daily but ... discarded immediately if obvious contamination occurs ... /also,/ workers should shower immediately. In chemical laboratory, gloves & gowns should always be worn ... however, gloves should not be assumed to provide full protection. Carefully fitted masks or respirators may be necessary when working with particulates or gases, & disposable plastic aprons might provide addnl protection. If gowns are of distinctive color, this is a reminder that they should not be worn outside of lab. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Operations connected with synth & purification ... should be carried out under well-ventilated hood. Analytical procedures ... should be carried out with care & vapors evolved during ... procedures should be removed. ... Expert advice should be obtained before existing fume cupboards are used ... & when new fume cupboards are installed. It is desirable that there be means for decreasing the rate of air extraction, so that carcinogenic powders can be handled without ... powder being blown around the hood. Glove boxes should be kept under negative air pressure. Air changes should be adequate, so that concn of vapors of volatile carcinogens will not occur. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Vertical laminar-flow biological safety cabinets may be used for containment of in vitro procedures ... provided that the exhaust air flow is sufficient to provide an inward air flow at the face opening of the cabinet, & contaminated air plenums that are under positive pressure are leak-tight. Horizontal laminar-flow hoods or safety cabinets, where filtered air is blown across the working area towards the operator, should never be used ... Each cabinet or fume cupboard to be used ... should be tested before work is begun (eg, with fume bomb) & label fixed to it, giving date of test & avg air-flow measured. This test should be repeated periodically & after any structural changes. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Principles that apply to chem or biochem lab also apply to microbiological & cell-culture labs ... Special consideration should be given to route of admin. ... Safest method of administering volatile carcinogen is by injection of a soln. Admin by topical application, gavage, or intratracheal instillation should be performed under hood. If chem will be exhaled, animals should be kept under hood during this period. Inhalation exposure requires special equipment. ... unless specifically required, routes of admin other than in the diet should be used. Mixing of carcinogen in diet should be carried out in sealed mixers under fume hood, from which the exhaust is fitted with an efficient particulate filter. Techniques for cleaning mixer & hood should be devised before expt begun. When mixing diets, special protective clothing &, possibly, respirators may be required. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": When ... admin in diet or applied to skin, animals should be kept in cages with solid bottoms & sides & fitted with a filter top. When volatile carcinogens are given, filter tops should not be used. Cages which have been used to house animals that received carcinogens should be decontaminated. Cage-cleaning facilities should be installed in area in which carcinogens are being used, to avoid moving of ... contaminated /cages/. It is difficult to ensure that cages are decontaminated, & monitoring methods are necessary. Situations may exist in which the use of disposable cages should be recommended, depending on type & amt of carcinogen & efficiency with which it can be removed. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": To eliminate risk that ... contamination in lab could build up during conduct of expt, periodic checks should be carried out on lab atmospheres, surfaces, such as walls, floors & benches, & ... interior of fume hoods & airducts. As well as regular monitoring, check must be carried out after cleaning-up of spillage. Sensitive methods are required when testing lab atmospheres. ... Methods ... should ... where possible, be simple & sensitive. ... /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Rooms in which obvious contamination has occurred, such as spillage, should be decontaminated by lab personnel engaged in expt. Design of expt should ... avoid contamination of permanent equipment. ... Procedures should ensure that maintenance workers are not exposed to carcinogens. ... Particular care should be taken to avoid contamination of drains or ventilation ducts. In cleaning labs, procedures should be used which do not produce aerosols or dispersal of dust, ie, wet mop or vacuum cleaner equipped with high-efficiency particulate filter on exhaust, which are avail commercially, should be used. Sweeping, brushing & use of dry dusters or mops should be prohibited. Grossly contaminated cleaning materials should not be re-used ... If gowns or towels are contaminated, they should not be sent to laundry, but ... decontaminated or burnt, to avoid any hazard to laundry personnel. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Doors leading into areas where carcinogens are used ... should be marked distinctively with appropriate labels. Access ... limited to persons involved in expt. ... A prominently displayed notice should give the name of the Scientific Investigator or other person who can advise in an emergency & who can inform others (such as firemen) on the handling of carcinogenic substances. /Chemical Carcinogens/
SRP: Contaminated protective clothing should be segregated in such a manner so that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. Quality assurance to ascertain the completeness of the cleaning procedures should be implemented before the decontaminated protective clothing is returned for reuse by the workers. Contaminated clothing should not be taken home at end of shift, but should remain at employee's place of work for cleaning.
The worker should immediately wash the skin when it becomes contaminated. /Liquid/
Work clothing that becomes wet should be immediately removed due to its flammability hazard.
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. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Personnel protection: Keep upwind. ... Do not handle broken packages unless wearing appropriate personal protective equipment. Approach fire with caution.
Evacuation: If material leaking (not on fire) consider evacuation from downwind area based on amount of material spilled, location and weather conditions.
【Protective Equipment and Clothing】
PRECAUTIONS FOR "CARCINOGENS": ... Dispensers of liq detergent /should be available./ ... Safety pipettes should be used for all pipetting. ... In animal laboratory, personnel should ... wear protective suits (preferably disposable, one-piece & close-fitting at ankles & wrists), gloves, hair covering & overshoes. ... In chemical laboratory, gloves & gowns should always be worn ... however, gloves should not be assumed to provide full protection. Carefully fitted masks or respirators may be necessary when working with particulates or gases, & disposable plastic aprons might provide addnl protection. ... Gowns ... /should be/ of distinctive color, this is a reminder that they are not to be worn outside the laboratory. /Chemical Carcinogens/
Wear appropriate personal protective clothing to prevent skin contact. /Liquid/
Wear appropriate eye protection to prevent eye contact. /Liquid/
Recommendations for respirator selection. Condition: At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: Respirator Class(es): Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive pressure mode. Any supplied-air respirator with a full facepiece and operated in pressure-demand or other positive pressure mode in combination with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive pressure mode.
Recommendations for respirator selection. Condition: Escape from suddenly occurring respiratory hazards: Respirator Class(es): Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister. Any appropriate escape-type, self-contained breathing apparatus.
【Octanol/Water Partition Coefficient】
log Kow= 1.57
【Disposal Methods】
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.
Spillage Disposal: Evacuate area and allow to evaporate.
Waste Disposal: Send unopened labeled container for recycling or disposal by burning. Dissolve the compound in a flammable solvent and spray into furnace with afterburner and scrubber.
PRECAUTIONS FOR "CARCINOGENS": There is no universal method of disposal that has been proved satisfactory for all carcinogenic compounds & specific methods of chem destruction ... published have not been tested on all kinds of carcinogen-containing waste. ... summary of avail methods & recommendations ... /given/ must be treated as guide only. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Incineration may be only feasible method for disposal of contaminated laboratory waste from biological expt. However, not all incinerators are suitable for this purpose. The most efficient type ... is probably the gas-fired type, in which a first-stage combustion with a less than stoichiometric air:fuel ratio is followed by a second stage with excess air. Some ... are designed to accept ... aqueous & organic-solvent solutions, otherwise it is necessary ... to absorb soln onto suitable combustible material, such as sawdust. Alternatively, chem destruction may be used, esp when small quantities ... are to be destroyed in laboratory. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": HEPA (high-efficiency particulate arrestor) filters ... can be disposed of by incineration. For spent charcoal filters, the adsorbed material can be stripped off at high temp & carcinogenic wastes generated by this treatment conducted to & burned in an incinerator. ... LIQUID WASTE: ... Disposal should be carried out by incineration at temp that ... ensure complete combustion. SOLID WASTE: Carcasses of lab animals, cage litter & misc solid wastes ... should be disposed of by incineration at temp high enough to ensure destruction of chem carcinogens or their metabolites. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": ... Small quantities of ... some carcinogens can be destroyed using chem reactions ... but no general rules can be given. ... As a general technique ... treatment with sodium dichromate in strong sulfuric acid can be used. The time necessary for destruction ... is seldom known ... but 1-2 days is generally considered sufficient when freshly prepd reagent is used. ... Carcinogens that are easily oxidizable can be destroyed with milder oxidative agents, such as saturated soln of potassium permanganate in acetone, which appears to be a suitable agent for destruction of hydrazines or of compounds containing isolated carbon-carbon double bonds. Concn or 50% aqueous sodium hypochlorite can also be used as an oxidizing agent. /Chemical Carcinogens/
PRECAUTIONS FOR "CARCINOGENS": Carcinogens that are alkylating, arylating or acylating agents per se can be destroyed by reaction with appropriate nucleophiles, such as water, hydroxyl ions, ammonia, thiols & thiosulfate. The reactivity of various alkylating agents varies greatly ... & is also influenced by sol of agent in the reaction medium. To facilitate the complete reaction, it is suggested that the agents be dissolved in ethanol or similar solvents. ... No method should be applied ... until it has been thoroughly tested for its effectiveness & safety on material to be inactivated. For example, in case of destruction of alkylating agents, it is possible to detect residual compounds by reaction with 4(4-nitrobenzyl)-pyridine. /Chemical Carcinogens/

Use and Manufacturing

【Use and Manufacturing】
Methods of Manufacturing

Vinyl bromide can be produced by catalytic addition of hydrogen bromide to acetylene in the presence of mercury &/or copper halide catalysts or by partial dehydrobromination of ethylene dibromide with alcoholic potassium hydroxide.
Prepared by the base-promoted dehydrobromination of ethylene dibromide.
U.S. Production

(1972) PROBABLY GREATER THAN 4.54X10+5 G
(1975) PROBABLY GREATER THAN 9.08X10+5 G
(1982) 2.3x10+7 kg
【Usage】
Used in small quantities as comonomer with acrylonitrile in prodn of fabrics and fabric blends to be used in sleepwear (mostly for children) and home furnishings.
【Sampling Procedures】
NIOSH Method 1009. Analyte: Vinyl bromide. Matrix: Air. Sampler: Solid sorbent tube (coconut shell charcoal, 400 mg/200 mg). Flow Rate: 0.01 to 0.2 l/m. Sample Size: 10 liters. Shipment: No special precautions. Sample Stability: At least 14 days @ 25 deg C.

Biomedical Effects and Toxicity

【Biomedical Effects and Toxicity】
IN SUBACUTE INHALATION STUDIES, RATS WERE EXPOSED TO 44 G/CU M (10,000 PPM) VINYL BROMIDE IN AIR 7 HR/DAY ON 5 DAYS A WK FOR 4 WK; OR RATS, RABBITS & MONKEYS WERE EXPOSED TO 1.1 OR 2.2 G/CU M (250 OR 500 PPM) VINYL BROMIDE FOR 6 HR A DAY ON 5 DAYS A WK FOR 6 MO. ... NON-VOLATILE BROMIDE LEVELS IN BLOOD INCR WITH DURATION OF EXPOSURE IN ALL THREE SPECIES & WERE PROPORTIONAL TO CONCN OF VINYL BROMIDE INHALED.
INHALATION PHARMACOKINETICS OF THE HALOGENATED ETHYLENES VINYL FLUORIDE, VINYL BROMIDE, PERCHLORETHYLENE (PER) AND TRICHLOROETHYLENE (TRI) WERE COMPARATIVELY STUDIED IN RATS. CMPD WITH LOW BOILING POINTS ARE ENRICHED IN TISSUES LESS THAN THOSE WITH HIGHER BOILING POINTS & VICE-VERSA. [FILSER JG, BOLT HM; ARCH TOXICOL 42 (2): 123-36 (1979)] PubMed Abstract
Comparative pharamacokinetics of vinyl fluoride, vinylidene fluoride, vinyl chloride ... & vinyl bromide were studied by inhalation in rats. Metabolic elimination of halogenated ethylenes was a saturable dose-dependent process. If animals were exposed to atmospheric concn of halogenated ethylene, which exceeded saturation, elimination was determined by a zero-order law. In contrast, below saturation, first-order kinetics was obtained.
Vinyl bromide is readily absorbed upon inhalation by rats and showed an 11-fold accumulation within the rats compared with the concentration in gaseous phase. Metabolism is saturable at exposure concentrations greater than 250 mg/cu m. Following inhalation in vinyl bromide by rats, rabbits, and monkeys, plasma levels of nonvolatile bromide increased with exposure duration, and more rapidly in phenobarbital-pretreated rats.
The US EPA calculated a permeability coefficient of 5.5X10(-3) cm/hr for vinyl bromide through human skin. Comparable calculations for vinyl chloride gave a value of 7.3X10(-3) cm/hr.

Environmental Fate and Exposure Potential

【Environmental Fate/Exposure Summary】
TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 170(SRC), determined from a log Kow of 1.57(2) and a regression-derived equation(3), indicates that vinyl bromide is expected to have moderate mobility in soil(SRC). Volatilization of vinyl bromide from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 1.4X10-2 atm-cu m/mole(SRC), using a fragment constant estimation method(4). The potential for volatilization of vinyl bromide from dry soil surfaces may exist based upon a vapor pressure of 1,030 mm Hg(5).
AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 170(SRC), determined from a log Kow of 1.57(2) and a regression-derived equation(3), indicates that vinyl bromide is expected to adsorb slightly to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 1.4X10-2 atm-cu m/mole(SRC), developed using a fragment constant estimation method(4). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 1.1 hrs and 4.1 days, respectively(SRC). According to a classification scheme(5), an estimated BCF of 3(SRC), from an estimated log Kow(2) and a regression-derived equation(6), suggests the potential for bioconcentration in aquatic organisms is low(SRC).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), vinyl bromide, which has a vapor pressure of 1,030 mm Hg at 25 deg C(2), will exist in the gas phase(SRC). Gas-phase vinyl bromide is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is 2.4 days(SRC), calculated from its rate constant of 6.8X10-12 cu cm/molecule-sec at 25 deg C(3).

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