Erickson, Philip wrote
>trichlorotrifluoromethane???????
>Six substituents on one carbon, I don't think so?
>Carbon is tetravalent => 4 max.
>BTW
Too many syllables, maybe? as it turns out 111Trichloroethane is the
dry-cleaning fluid type solvent that I lived with for so long An old
boss called it "safety solvent...safe to bathe in!"...data below:
1,1,1-trichloroethane
CATEGORY: Chlorinated hydrocarbon
USE
Domestic: It is an ingredient in consumer products such as household
cleaners, glues, and aerosol sprays.
Agricultural:
Industrial: Solvent and degreasing agent in industry. Recently found wide
use as a substitute for carbon tetrachloride (US EPA).
ACUTE TOXICITY
Effects reported in humans due to acute (short-term) inhalation exposure
to 1,1,1-trichloroethane include hypotension, mild hepatic effects, and
central nervous system (CNS) depression. Cardiac
arrhythmia and respiratory arrest may result from the depression of the
CNS. Symptoms of acute inhalation exposure include dizziness,nausea,
vomiting, diarrhea, loss of consciousness, and decreased blood pressure
(US EPA).
CHRONIC TOXICITY
After chronic (long-term) inhalation exposure to1,1,1-trichloroethane,
some liver damage was observed in mice and ventricular arrhythmia in
humans (US EPA). Carcinogenic: US EPA Classification: Group D (not
classifiable as to
human carcinogenicity), based on no reported human data and inadequate
animal data.
Mutagenic:
Teratogenic:
Reproductive effects: No information is available on the reproductive or
developmental effects of 1,1,1-trichloroethane in humans. Several studies
in several animal species found no evidence that the chemical has
reproductive effects.
FATE IN THE ENVIRONMENT
The estimated half-life for methylchloroform in air is 2.2 to 4.8
years. Evaporation and leaching are the major routes of removal from
soils. Volatilisation into the atmosphere is the main route of removal
from water. The half-life in water ranges from hours to weeks. Due
to the large output and slow degradation of the chemical, the
atmospheric concentration is increasing by 4.8 -17% a year (US EPA).
ACTION ON ANIMALS
Methylchloroform has moderate acute toxicity to aquatic organisms. LC50
and EC50 values for methylchloroform in aquatic organisms range from
approximately 30 to 130 mg/L; these values exceed measured concentration
in untreated ground or surface waters by several orders of magnitude (US
EPA).
ACTION ON PLANTS
REFERENCES
US EPA. http://www.epa.gov/ttn/uatw/hlthef/trichlor.html,
http://www.epa.gov/opptintr/chemfact/s_methch.txt
Worksafe.
http://www.worksafe.gov.au/worksafe/exp/09/111Trichloroethane.htm
==========================================================================
Marc Tyler
Designer,
Animal Firm
830-324-6578
www.animalfirm.com
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