Ethyl mercaptan is not an oil.
Tetrahydrothiophene and amyl mercaptan are examples; but ethyl mercaptan is preferred now.
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Ethyl mercaptan
ethyl mercaptan
ethyl mercaptan
This substance is ethyl mercaptan.
None. Ethyl mercaptan is not used to odorize natural gas. The normal odorant used for natural gas is tertiary butyl mercaptan, which is present at a concentration of approximately 0.5 pound/million standard cubic feet of gas.
ethanithiol ( IUPAC) ethyl mercaptan is added in lpg to detect leakage by the odour.
The mercaptan odor has been added specifically to assist in the detection of leaks. If odor from the gas is noticed, the implication is that you have a leak. Attend to it promptly.
"Historically, first gas odorization was carried out in Germany in 1880's by Von Quaglio who used ethyl mercaptan for detecting gas leakages of blue water gas."
That is not a very clear question. Are you asking if the materials left in a propane tank could be toxic if you use the tank for water? If so, then the answer is yes, but you are not going to be having a lot of ethyl mercaptan. An old propane tank can contain a significant amount of hydrocarbons, usually in the gasoline and diesel boiling point range.