USD $5.00-10.00 / Gram
USD $10.00-100.00 / Kilogram
USD $1.00-10.00 / Kilogram
USD $10.00-100.00 / Kilogram
tebipenem pivoxil |
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verified by |
gmp,fda,cep,cos,anda |
service |
1, professional techincal guidence
4, lifetime customer service since first deal |
process |
tetrachloroethylene |
product details |
tetrachloroethylene animal studies and a study of 99 twins showed there is a "lot of circumstantial evidence" that exposure to tetrachloroethylene increases the risk of developing parkinson's disease ninefold. larger population studies are planned. at temperatures over 315 °c (599 °f), such as in welding, tetrachloroethylene can be oxidized into phosgene, an extremely poisonous gas.[10] therefore, tetrachloroethylene should not be used near welding operations, flames, or hot surfaces. testing for exposure[edit]tetrachloroethylene exposure can be evaluated by a breath test, analogous to breath-alcohol measurements. because it is stored in the body's fat and slowly released into the bloodstream, tetrachloroethylene can be detected in the breath for weeks following a heavy exposure. tetrachloroethylene and trichloroacetic acid (tca), a breakdown product of tetrachloroethylene, can be detected in the blood. in europe, the scientific committee on occupational exposure limits (scoel) recommends for tetrachloroethylene an occupational exposure limit (8 hour time-weighted average) of 20 ppm and a short-term exposure limit (15 min) of 40 ppm. environmental contamination[edit]tetrachloroethylene is a common soil contaminant. with a specific gravity greater than 1, tetrachloroethylene will be present as a dense nonaqueous phase liquid (dnapl) if sufficient quantities are released. because of its mobility in groundwater, its toxicity at low levels, and its density (which causes it to sink below the water table), cleanup activities are more difficult than for oil spills (which has a specific gravity less than 1). recent research has focused on the in place remediation of soil and ground water pollution by tetrachloroethylene. instead of excavation or extraction for above-ground treatment or disposal, tetrachloroethylene contamination has been successfully remediated by chemical treatment or bioremediation. bioremediation has been successful under anaerobic conditions by reductive dechlorination by dehalococcoides sp. and under aerobic conditions by cometabolism by pseudomonas sp.[13][14] partial degradation daughter products include trichloroethylene, cis-1,2-dichloroethene and vinyl chloride; full degradation converts tetrachloroethylene to ethene and hydrogen chloride dissolved in water. estimates state that 85% of tetrachloroethylene produced is released into the atmosphere; while models from oecd assumed that 90% is released into the air and 10% to water. based on these models, its distribution in the environment is estimated to be in the air (76.39% - 99.69%), water (0.23% - 23.2%), soil (0.06-7%), with the remainder in the sediment and biota. estimates of lifetime in the atmosphere vary, but a 1987 survey estimated the lifetime in the air has been estimated at about 2 months in the southern hemisphere and 5–6 months in the northern hemisphere. degradation products observed in a laboratory include phosgene, trichloroacetyl chloride, hydrogen chloride, carbon dioxide, and carbon monoxide. tetrachloroethylene is degraded by hydrolysis, and is also persistent under aerobic conditions. this compound is degraded by reductive dechlorination with anaerobic conditions present, with the degradation products such as trichloroethylene, dichloroethylene, vinyl chloride, ethylene, and ethane.
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packaging the packaging can be customized, normally, 1kgs/tin, or 5kgs/tin or per drums |
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company introduction |
top pharm chemical group is specialized in the new drug researching and developing, and mainly manufacture chemical intermediates, pharmaceutical apis and pilot production. to meet customers regulatory needs, we can offer products from gram to kilo and tons scale, and we can also support our customers with the dmf and other documents to complete the registration. our targets: "best technic; better quality; better price; better service" main products: anidulafungin,micafungin,caspofungin,posaconazole etc. (anti-infective) ixabepilone, argatroban, decitabine, everolimus etc. (anti-tumor) epothilone b, tacrolimus, rapamycin,temsirolimus etc. (fermentation) bimatoprost, latanoprost, travoprost, cloprostenol etc.(prostaglandins) |
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