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Forum index » Science and Technology » Chem » Analytical
what's the gas with the smell of ammonia
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Shankar Bhattacharyya
science forum beginner


Joined: 15 Mar 2006
Posts: 7

PostPosted: Sat Jun 17, 2006 12:47 am    Post subject: Re: what's the gas with the smell of ammonia Reply with quote

beav <BEAVITH1@NETSCAPE.NET> wrote in
news:t6s592d7222vmffvgkc2sgqg7huqrd20ne@4ax.com:

Of the gas under discussion:

Quote:
these are still mutually exclusive indications.

Not necessarily. The indications may derive from multiple gases, with
unrelated properties. Farooq has proposed an impurity. Perhaps one
should go further and consider multiple components at real, non-impurity
levels.

Like him, I considered gc/ms. No separation is necessary as a
preliminary step. Just shoot some of the gas into the injector port, let
it come off the column, presumably unretained, collect data from time 0,
without a solvent delay and the resultant mass spectra could be
informative.

- Shankar
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cody@jeol.com
science forum beginner


Joined: 23 Mar 2006
Posts: 2

PostPosted: Mon Jun 19, 2006 12:20 pm    Post subject: Re: what's the gas with the smell of ammonia Reply with quote

Re: GC/MS analysis. Try injecting the gas with a gas-tight syringe.
If you have the option, start with a short column in case the gas is
sticky and does not go through the column. Use a longer column if the
gas components are not retained.

If direct injection does not work because the gas is in low
concentration, consider solid-phase microextraction or a headspace
sampler/cryotrap setup.

Given the reaction conditions, it is a real possibility that the gas
will react with the column. You may want to try a deactivated, uncoated
fused-Si column. You won't get separation, but you may get a mass
spectrum.

Good luck!

Shankar Bhattacharyya wrote:
Quote:
beav <BEAVITH1@NETSCAPE.NET> wrote in
news:t6s592d7222vmffvgkc2sgqg7huqrd20ne@4ax.com:

Of the gas under discussion:

these are still mutually exclusive indications.

Not necessarily. The indications may derive from multiple gases, with
unrelated properties. Farooq has proposed an impurity. Perhaps one
should go further and consider multiple components at real, non-impurity
levels.

Like him, I considered gc/ms. No separation is necessary as a
preliminary step. Just shoot some of the gas into the injector port, let
it come off the column, presumably unretained, collect data from time 0,
without a solvent delay and the resultant mass spectra could be
informative.

- Shankar
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