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EC number: 200-891-8 | CAS number: 75-68-3
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Additional information on environmental fate and behaviour
Administrative data
- Endpoint:
- additional information on environmental fate and behaviour
- Type of information:
- other: overview
- Adequacy of study:
- other information
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Several studies, published in peer reviewed literature, adequate for assessment
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- Photolysis of 1,1,1-difluorochloroethane, Internal Journal of Chemical Kinetics, vol. IX, 697-703.
- Author:
- Ichimura T, Kirk, AW and Tschuikow-roux, E
- Year:
- 1 977
- Bibliographic source:
- Internal Journal of Chemical Kinetics, vol. IX, 697-703.
- Reference Type:
- publication
- Title:
- Products of the tropospheric reactions of hydrochlorofluorocarbons (HCFCs-225ca -225cb -141b and -142b
- Author:
- Tuazon EC and Atkinson R
- Year:
- 1 994
- Bibliographic source:
- Environmental Science and Technology
- Reference Type:
- publication
- Title:
- The environmental impact of CFC replacements - HFCs and HCFCs
- Author:
- Wallington TJ, Schneider WF, Worsnop DR, Nielsen OJ, Sehested J, DeBruyn WJ, Shorter JA
- Year:
- 1 994
- Bibliographic source:
- Environmental Science and Technology 28:320A-326A
- Reference Type:
- publication
- Title:
- Rate constants for the reactions of OH with HC3CFCl2 (HCFC-141b), CH3CF2Cl (HCFC-142b), and CH2FCF3 (HFC-134a)
- Author:
- Zhang Z, Huie RE and Kurylo MJ
- Year:
- 1 992
- Bibliographic source:
- Journal Physics and Chemical 96: 1533-1535
Materials and methods
Test material
- Reference substance name:
- 1-chloro-1,1-difluoroethane
- EC Number:
- 200-891-8
- EC Name:
- 1-chloro-1,1-difluoroethane
- Cas Number:
- 75-68-3
- Molecular formula:
- C2H3ClF2
- IUPAC Name:
- 1-chloro-1,1-difluoroethane
Constituent 1
Results and discussion
Applicant's summary and conclusion
- Executive summary:
Degradation products of HCFC 142 (Cas no. 75-68-3)
Summaries of studies
1,1,1-Difluorochloroethane was photolyzed at 147 nm in the pressure range of 3.6-20.6 torr (Ichimura et al. 1977). The effects of added NO, H2S, and CF4were investigated. The extinction coefficient at 147 nm and 296 °K was determined to be 64 ± 8 atm-1·cm-1. The molecule photodecomposes largely bya,ßelimination of HCl to give 1,1 -difluoroethylene (F0.74 ± 0.06). There is no observable elimination of HF, but there is strong evidence for the elimination of the elements of FCl though the relative importance of this process is minor, as are contributions from carbon-carbon and carbon-halogen bond fission. There were no significant variations in the quantum yields of the principal products with time in the range of 40-180 minutes. The major observed product was 1,1-difluoroethylene (CH2CF2). The quantum yields of all other products were between one and two orders of magnitude lower than those of CH2CF2. Since CH2CF2is the major product with a quantum yield unaffected by the addition of NO, the most important primary process is molecular elimination of HCI [reaction (2)]:
(1) CH3CF2Cl + hvàCH3CF2Cl
(2) CH3CF2ClàCH2CF2•+ HCl•; ¿H = 21.9 kcal/mol
The rate constants for the reaction of OH with CH3CFCl2(HCFC-141b) over the temperature range 250-297 K were measured with improved detection sensitivity as a function of flash energy and concentration of OH radical precursor (H2O)(Zhang et al. 1992). The rate constants were reduced at the lower OH concentrations employed, suggesting complications due to secondary reactions. The new values disagree with the low-temperature values reported earlier but agree with the values extrapolated from the higher temperature results (T> 298 K). In contrast, rate constants for CH3CFCl2(HCFC-142b) and CH2FCF3(HFC-134a), re-measured at the lower flash energy at 270 K, were found to agree with those reported earlier at higher flash energy. The diagnostic rate constant measurement for reactions of OH with CH3CFCl2was:
OH + CH3CFCl2àH2O + CH2CFCl2
An evaluation of the environmental impact of HFCs and HCFCs is given in terms of their ozone depletion potentials, global warming potentials, and ability to form noxious degradation products (Wallington et al. 1994). This evaluation is based on an overview of their atmospheric chemistry and the gas- and liquid-phase loss processes of their halocarbonvl decomposition products. The atmospheric fate of the alkoxy radical is either decomposition or reaction with O2. For HCFC-142b reaction with O2dominates giving CF2ClCHO.
The Cl atom-initiated photooxidation of CF3CF2CHCl2(HCFC-225ca) produced CF3CF2C(O)Cl in 100% yield, while CF2ClCF~HFCl(HCFC-225cb) yielded CF2ClCF2-C(O)F (99%) and C(O)FCl (1 %). The two-carbon aldehydes CFCl2CHO and CF2ClCHOwere positively observed as photooxidation products of CFCl2CH3(HCFC-141b) and CF2ClCH3(HCFC-142b), respectively. Their calculated 100%formation yields show conclusively that under lower tropospheric conditions the alkoxy radicals CFCl2-CH2O and CF2ClCH2O do not undergo C-C bond scission, but rather react with O2to form the aldehydes and HO2.
The contributions of two competing reaction pathways for the acyl radicals formed from the OH radical-initiated reactions of halogenated aldehydes, CX3COàCX3+ CO (a) and CX3CO + O2àCX3C(O)OO (b), were determined as 79±7% (a) and 21± 5% (b) for the acyl radical CFCl2-CO and 39±3% (a) and 61±5% (b) for CF2ClCO at 298 K and 740 Torr of air. These results are intermediate and consistent with those reported in the literature for the corresponding reactions of CCl3CO and CF3CO radicals.
References
Ichimura T, Kirk, AW and Tschuikow-roux, E (1977) Photolysis of 1,1,1-difluorochloroethane, Internal journal of chemical kinetics, vol. IX, 697-703.
Tuazon, EC., and Atkinson R, Products of the tropospheric reactions of hydrochlorofluorocarbons (HCFCs-225ca -225cb -141b and -142b, Env.Science and Technology, 1994.
Wallington TJ, Schneider WF, Worsnop DR, Nielsen OJ, Sehested J, DeBruyn WJ, Shorter JA (1994) The environmental impact of CFC replacements - HFCs and HCFCs, Environmental Science and Technology 28:320A-326A.
Zhang Z, Huie RE and Kurylo MJ (1992) Rate constants for the reactions of OH with HC3CFCl2 (HCFC-141b), CH3CF2Cl (HCFC-142b), and CH2FCF3 (HFC-134a), Journal Physics and Chemical 96: 1533-1535.
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