ブロモアセトニトリル

EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

SMALL SPILLS AND LEAKAGE: If you should spill this chemical, use absorbent paper to pick up all liquid spill material. Seal the absorbent paper, as well as any of your clothing which may be contaminated, in a vapor-tight plastic bag for eventual disposal. Wash any surfaces you may have contaminated with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity 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 and plant life; and conformance with environmental and public health regulations.

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 9(SRC), determined from a structure estimation method(2), indicates that bromoacetonitrile is expected to have very high mobility in soil(SRC). Volatilization of bromoacetonitrile from moist soil surfaces is expected to occur(SRC) given an estimated Henry's Law constant of 3.52X10-6 atm-cu m/mole(SRC), using a fragment constant estimation method(2). Bromoacetonitrile is expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 3.2 mm Hg at 25 °C(SRC), determined from a fragment constant method(2). The aqueous hydrolysis rate constant for bromoacetonitrile at 20 °C and pH 8.7 was experimentally determined to be 2.7X10-6/sec(5) which corresponds to a half-life of 2.9 days(SRC); hydrolysis rates at neutral or acidic conditions is much slower(5) by approximately one to two orders of magnitude based on observed hydrolysis rates of the nine haloacetonitriles used in the study(SRC). Therefore, hydrolysis may be an important fate process, especially in moist alkaline soils(SRC). Biodegradation data in soil were not available(SRC, 2012).

AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 9(SRC), determined from a structure estimation method(2), indicates that bromoacetonitrile is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected to occur(3) based upon an estimated Henry's Law constant of 3.52X10-6 atm-cu m/mole(SRC), developed using a fragment constant estimation method(2). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 12 and 87 days, respectively(SRC). According to a classification scheme(4), an estimated BCF of 3(SRC), from an estimated log Kow of 0.20(2) and a regression-derived equation(2), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Biodegradation data were not available. The aqueous hydrolysis rate constant for bromoacetonitrile at 20 °C and pH 8.7 was experimentally determined to be 2.7X10-6/sec(5) which corresponds to a half-life of 2.9 days(SRC); hydrolysis rates at neutral or acidic conditions is much slower(5) by approximately one to two orders of magnitude based on observed hydrolysis rates of the nine haloacetonitriles used in the study(SRC). Biodegradation data in water were not available(SRC, 2012).

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), bromoacetonitrile, which has an estimated vapor pressure of 3.2 mm Hg at 25 °C(SRC), determined from a fragment constant method(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase bromoacetonitrile 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 323 days(SRC), calculated from its rate constant of 5X10-14 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(2). Bromoacetonitrile may be sensitive to prolonged exposure to light(3); therefore, bromoacetonitrile may be susceptible to direct photolysis by sunlight(SRC).

The following link will take the user to the National Toxicology Program (NTP) Test Agent Search Results page, which tabulates all of the "Standard Toxicology & Carcinogenesis Studies", "Developmental Studies", and "Genetic Toxicity Studies" performed with this chemical. Clicking on the "Testing Status" link will take the user to the status (i.e., in review, in progress, in preparation, on test, completed, etc.) and results of all the studies that the NTP has done on this chemical.[Available from, as of June 21, 2012: http://ntp-apps.niehs.nih.gov/ntp_tox/index.cfm?fuseaction=ntpsearch.searchresults&searchterm=590-17-0]

Using a structure estimation method based on molecular connectivity indices(1), the Koc of bromoacetonitrile can be estimated to be 9(SRC). According to a classification scheme(2), this estimated Koc value suggests that bromoacetonitrile is expected to have very high mobility in soil.

/CASE REPORTS/ A 28-year-old chemist,with no history of skin disease,working in a pharmaceutical laboratory, presented with eczema on the hands,with scaling and fissuring of the fingers. She was occupationally exposed to numerous chemicals and generally wore protective gloves in her work. She was patch tested with the GEIDC standard series and with 26 different compounds that she was using at that moment in the laboratory. At D2 and D4, there were positive reactions (++) to ethyl bromoacetate (1% pet.) and bromoacetonitrile (1% pet.), but no reactions to any other substance. Patch tests in 25 controls were negative. After she was instructed to avoid further contact with ethyl bromoacetate and bromoacetonitrile, her eczema subsided within a few weeks. No recurrence was observed during 2-year follow-up.

/GENOTOXICITY/ HAN produced DNA strand breaks in cultured human lymphoblastic (CCRF-CEM) cells, bound to the nucleophilic trapping agent 4-(p-nitrobenzyl)pyridine and formed a covalent bond to polyadenylic acid in a cell-free reaction system. Thus, we have demonstrated that these chemicals are genotoxic, which would indicate a potential for carcinogenic activity and for human health hazard. /haloacetonitriles/

/ALTERNATIVE and IN VITRO TESTS/ The present studies were initiated to measure the permeation coefficients (K(p) ) for haloacetonitriles (HANs) and chloral hydrate (CH), important cytotoxic DBPs. The K(p) values measured using fully hydrated dermatomed torso skin at 37 °C for the HANs ranged from 0.099 to 0.17 cm h(-1) , and was 0.0039 cm h(-1) for CH. Of the HANs, dibromoacetonitrile had the highest permeability while chloroacetonitrile had the lowest permeability and a direct relationship was observed between their K(p) and their octanol/water partition coefficients (K(ow) ). The K(p) values of the HANs were also approximately 30 times that of CH. The monthly dermal and ingestion doses of HANs and CH of an average American population were estimated using Monte Carlo simulations. The dermal doses of HANs from showering and bathing ranged from 0.39 to 0.78 times their ingestion doses but only approximately 0.02 times their ingestion doses for CH, assuming that the K(p) values determined are applicable to shorter water contact times. However, that ratio can vary markedly with chlorinated swimming pool exposures, with a range of 0.30-2.3 for HANs and 0.19-0.25 for CH. Dermal exposure to HANs and CH seems to be a significant route of exposure and should be considered when evaluating their total exposure during the routine usage of water for bathing and swimming. /haloacetonitriles/

Bromoacetonitrile's production and use as an intermediate in organic synthesis(1) may result in its release to the environment through various waste streams(SRC). Bromoacetonitrile is a water disinfection byproduct of chlorination treatments(2-5).

An estimated BCF of 3 was calculated in fish for bromoacetonitrile(SRC), using an estimated log Kow of 0.20(1) and a regression-derived equation(1). According to a classification scheme(1), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC).

The Henry's Law constant for bromoacetonitrile is estimated as 3.52X10-6 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This Henry's Law constant indicates that bromoacetonitrile is expected to volatilize slowly from water surfaces(2). 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)(2) is estimated as 12 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)(2) is estimated as 87 days(SRC). Bromoacetonitrile's Henry's Law constant(1) indicates that volatilization from moist soil surfaces may occur(SRC). Bromoacetonitrile is expected to volatilize from dry soil surfaces(SRC) based upon an estimated vapor pressure of 3.2 mm Hg at 25 °C(SRC), determined from a fragment constant method(1).

/GENOTOXICITY/ Three short-term assays (the SOS chromotest, the Ames-fluctuation test and the newt micronucleus test) were carried out to evaluate the genotoxicity of six halogenated acetonitriles identified in chlorinated waters (monochloro-, dichloro-, trichloro-, monobromo-, dibromo- and bromochloroacetonitrile). ... In the Ames-fluctuation test, all the compounds except dibromoacetonitrile showed mutagenic activity on Salmonella typhimurium strain TA100. The newt micronucleus assay detected a clastogenic effect on the peripheral blood erythrocytes of Pleurodeles waltl larvae for all the six haloacetonitriles studied. Moreover, two structure-activity relationships were noted: (1) the genotoxic activity of haloacetonitriles containing bromine substituents appeared higher than the corresponding chlorinated acetonitriles and (2) the clastogenic activity of the chlorinated acetonitriles increased with the number of chlorine substituents.

/GENOTOXICITY/ Using microplate-based Chinese hamster ovary (CHO) cell assays for chronic cytotoxicity and acute genotoxicity, /investigators/ analyzed 7 HANs: iodoacetonitrile (IAN), bromoacetonitrile (BAN), dibromoacetonitrile (DBAN), bromochloroacetonitrile (BCAN), chloroacetonitrile (CAN), dichloroacetonitrile (DCAN), and trichloroacetonitrile (TCAN). The cytotoxic potency (%C1/2 values) ranged from 2.8 uM (DBAN) to 0.16 mM (TCAN), with a descending rank order of DBAN > IAN approximately BAN > BCAN > DCAN > CAN > TCAN. HANs induced acute genomic DNA damage; the single cell gel electrophoresis (SCGE) genotoxicity potency ranged from 37 uM (IAN) to 2.7 mM (DCAN). The rank order of declining genotoxicity was IAN > BAN approximately DBAN > BCAN > CAN > TCAN > DCAN. The accompanying structure-activity analysis of these HANs was in general agreement with the genotoxicity rank order. ... As a chemical class, the HANs are more toxic than regulated carbon-based DBPs, such as the haloacetic acids. ... /haloacetonitriles/

/GENOTOXICITY/ ... In this study, the ability of /haloacetonitiriles (HAN)/ to induce single-strand breaks on the DNA of HeLa S3 cells was investigated using the single-cell gel electrophoresis (SCGE) assay, which could be a good tool with which to evaluate the genotoxicity of chlorinated water. The results were compared to those obtained in the Ames fluctuation test using the Salmonella typhimurium TA 100 strain without activation. With the Ames fluctuation test, a mutagenic effect was observed for chloroacetonitrile (MCAN), dichloroacetonitrile (DCAN), and trichloroacetonitrile (TCAN). ... In the SCGE assay, all five HANs induced DNA damage in HeLa S3 cells, increasing the mean tail moment significantly. For each compound, a dose-effect relation was observed. This study shows that the SCGE assay has greater sensitivity for assessing the genotoxicity of HAN than does the Ames-fluctuation test. Brominated acetonitriles were more genotoxic than chlorinated acetonitriles in the SCGE assay, and the genotoxicity increased with the number of halogenated atoms of the compound. .../haloacetonitriles/

The rate constant for the vapor-phase reaction of bromoacetonitrile with photochemically-produced hydroxyl radicals has been estimated as 5X10-14 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1). This corresponds to an atmospheric half-life of about 323 days at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1). The aqueous hydrolysis rate constant for bromoacetonitrile at 20 °C and pH 8.7 was experimentally determined to be 2.7X10-6/sec(2) which corresponds to a half-life of 2.9 days(SRC). Hydrolysis rates at neutral or acidic conditions is much slower(2) by approximately one to two orders of magnitude based on observed hydrolysis rates of the nine haloacetonitriles used in the study(SRC). Under basic conditions, aqueous hydrolysis of bromoacetonitrile yields the corresponding acetamide, which in basic media can be further hydrolyzed to the corresponding acid(2). Bromoacetonitrile may be sensitive to prolonged exposure to light(3); therefore, bromoacetonitrile may be susceptible to direct photolysis by sunlight(SRC).

Occupational exposure to bromoacetonitrile may occur through inhalation and dermal contact with this compound at workplaces where bromoacetonitrile is produced or used(SRC). Bromoacetonitrile is reported to be a disinfectant by-product of drinking water chlorination via chlorine, chloramine or chlorine dioxide treatment(1-4); therefore, the general population may be exposed to bromoacetonitrile through tap water containing this by-product(SRC).

DRINKING WATER: Bromoacetonitrile was selected as a priority disinfection by-product to be included in a US nantionwide occurrence study(1,2). Based on a study of 35 water utilities across the US by the EPA and State of California Department of Health Services, the quarterly median concentrations of haloacetoniriles were 2.8, 2.5, 3.5 and 4.0 ug/L from the spring of 1988 through the winter of 1989(3). Specific concentrations of bromoacetonitrile were not reported, but may have been detected(3). Bromoacetonitrile was qualitatively detected in drinking water collected in Israel that had undergone disinfection treatment via chlorination and chlorine dioxide(3); the source waters were high in bromide content(4).

HTS (High Throughput Screening) initiative chemical

Intermediate in organic synthesis

Pharmaceutical intermediates