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79-34-5

Name 1,1,2,2-Tetrachloroethane
CAS 79-34-5
EINECS(EC#) 201-197-8
Molecular Formula C2H2Cl4
MDL Number MFCD00000848
Molecular Weight 167.85
MOL File 79-34-5.mol

Chemical Properties

Appearance Tetrachloroethane is a heavy, volatile colorless to light yellow liquid. It has a sweetish, chloroform-like odor. The Odor Threshold is 0.5 ppm in water and 1.5 ppm in air.
Melting point  -43 °C
Boiling point  147 °C(lit.)
density  1.586 g/mL at 25 °C(lit.)
vapor density  5.8 (vs air)
vapor pressure  8 mm Hg ( 20 °C)
refractive index  n20/D 1.494(lit.)
Fp  142-146°C
storage temp.  Refrigerator
solubility  2830g/l
form  Liquid
color  slightly green-yellow
Stability: Stable. Incompatible with strong oxidizing agents, strong bases. Reacts violently with sodium, potassium, nitrates, 2,4-dinitrophenyl disulphide.
Water Solubility  0.3 g/100 mL (25 ºC)
Merck  14,9189
BRN  969206
Henry's Law Constant 6.22 at 30 °C (headspace-GC, Sanz et al., 1997)
Dielectric constant 8.4199999999999999
Exposure limits Potential occupational carcinogen. NIOSH REL: TWA 1 ppm (7 mg/m3), IDLH 100 ppm; OSHA PEL: TWA 5 ppm (35 mg/m3); ACGIH TLV: TWA 1 ppm (adopted).
CAS DataBase Reference 79-34-5(CAS DataBase Reference)
IARC 2B (Vol. 20, Sup 7, 71, 106) 2014
NIST Chemistry Reference Ethane, 1,1,2,2-tetrachloro-(79-34-5)
EPA Substance Registry System 1,1,2,2-Tetrachloroethane (79-34-5)

Safety Data

Hazard Codes  T+,N,T,F
Risk Statements 
R26/27:Very Toxic by inhalation and in contact with skin .
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment .
R59:Dangerous for the ozone layer.
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
R11:Highly Flammable.
Safety Statements 
S38:In case of insufficient ventilation, wear suitable respiratory equipment .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S36/37:Wear suitable protective clothing and gloves .
RIDADR  UN 1702 6.1/PG 2
WGK Germany  3
RTECS  KI8575000
TSCA  Yes
HazardClass  6.1
PackingGroup  II
HS Code  29031990
Safety Profile
Suspected carcinogen with experimental carcinogenic and tumorigenic data. Poison by inhalation, ingestion, and intraperitoneal routes. Moderately toxic by several other routes. Mutation data reported. Human central nervous system effects by ingestion and inhalation: general anesthesia, somnolence, hallucinations, and distorted perceptions. Considered the most toxic of the common chlorinated hydrocarbons. Considered to be a very severe industrial hazard and its use has been restricted or even forbidden in certain countries. It is not an inert solvent. Reacts violently with N2O4,2,4dinitrophenyl disulfide, and on contact with sodium or potassium. When heated in contact with solid potassium hydroxide, spontaneously flammable chloroor dichloroacetylene gas is evolved. Any water can cause appreciable hydrolysis, even at room temperature, and both hydrolysis and oxidation become comparatively rapid above 110'. When heated to decomposition it emits toxic fumes of Cl-. A strong irritant of eyes and mucous membranes. A concentration of 3 ppm produces a detectable odor, thus an initial produces a detectable odor, thus an initial warning effect. Its narcotic action is stronger than that of chloroform, but, because of its low volatility, narcosis is less severe and much less common in industrial poisoning than in the case of other chlorinated hydrocarbons. The toxic action of this material is chiefly on the liver, where it produces acute yellow atrophy and cirrhosis. Fatty degeneration of the kidneys and heart, hemorrhage into the lungs and serous membranes, and edema of the brain have also been found in fatal cases. Some reports indicate a toxic action on the central nervous system with changes in the brain and in the peripheral nerves. The effect on the blood is one of hemolysis with appearance of young cells in the circulation and a monocptosis. Due to its solvent action on the natural skin oils, dermatitis is not uncommon. The initial symptoms resulting from exposure to the vapor are lachrymation, salivation, and irritation of the nose and throat. Continued exposure to high concentrations results in restlessness, dizziness, nausea, vomiting, and narcosis. The latter, however, is rare in industry. More commonly, exposure is less severe and most complaints are vague and related to the digestive and nervous systems. The patient's symptoms gradually progress to a more serious illness with development of toxic jaundice, liver tenderness, etc., and possibly albuminuria and edema. With serious liver damage, the jaundice increases and toxic symptoms appear, with somnolence, delirium, convulsions, and coma usually precedmg death. See also ACETYLENE COMPOUNDS and CHLORIDES.
Hazardous Substances Data 79-34-5(Hazardous Substances Data)
Toxicity
LD50 orally in rats: 0.20 ml/kg (Smyth)
IDLA 100 ppm

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