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"incubating" hexane
Posted: Tue Oct 02, 2007 12:31 pm
by WK
Hi all,
I have a method paper which involves "incubating" a capped vial of 1ml hexane (HFBI 50ul deriv. and 200ppb dichlorobenzene IS) at 70degC for 1/2hr? I would have thought this would be performed in a water bath? Surely not in an oven!
Any other ways I could do this?
Regards
WK
Posted: Tue Oct 02, 2007 1:50 pm
by chromatographer1
What difference would a water bath at 70°C be from a dry oven at 70°C?
As long as the capped vial stays sealed and the vial is able to withstand the pressure generated and the temperature I don't see a difference.
Do you? What would be the difference?
best wishes,
Rod
Posted: Tue Oct 02, 2007 2:12 pm
by WK
Thanks C1,
I would be concerned if the vial failed and it was not a flameproof electrics oven. Hexane is good for the method (polarity & splitless injection) - but 70degc is the bpt of hexane.
Posted: Tue Oct 02, 2007 2:55 pm
by chromatographer1
I would be concerned too.
But there are dry heating blocks with controlled temperatures, placed in a hood, and there are such things as ampules that can be sealed in an inert atmosphere, heated, and then opened for analysis.
There are ways to do this. But I would not heat the vial under an open flame, or do anything that smacks of foolishness.
I know you wouldn't either.
best wishes,
Rod
Posted: Tue Oct 02, 2007 2:56 pm
by AICMM
WK,
We used to use an electric skillet filled with play sand in a hood to do micro KD's. You will want to make sure the caps are on tight enough that they do not pop!.
Best regards.
Posted: Tue Oct 30, 2007 4:04 pm
by WK
I was watching a TV programme on the BBC the other day and they demonstrated why Nobel used sand dunes between his production huts for nitroglycerine manufacture!