I've got the diisopropylnapthalene blues

Discussions about GC and other "gas phase" separation techniques.

3 posts Page 1 of 1
Ahoy!
My GC-MS system (Trace Ultra and ISQ) is contaminated with diisopropylnapthalene (DIPN) isomers and I can't figure out where it is coming from. It is present even in blank injections. I have swapped columns (30m DB-5 to 60m DB-5MS+DG), syringes, septa, solvents, wash bottles, inlet liners, etc. and cleaned the inlet thoroughly. I replaced the cartridge in the gas filter. Ours is a geochemistry lab so DIPN is not something we analyze . . . at least not deliberately. The concentration has increased over the past year until it is now a prominent set of peaks in an otherwise clean n-hexane injection.

There is a thread from a few years ago on this forum about DIPN contamination, but no resolution. Any suggestions would be very much appreciated.

Thanks,
Michael
Hi,
you need to find the source of contamination and eliminate it.

BTW - fact that you changed septa, syringes, solvents etc. doesn't mean that the new ones are free of contaminants.
dblux_ wrote:
Hi,
you need to find the source of contamination and eliminate it.

BTW - fact that you changed septa, syringes, solvents etc. doesn't mean that the new ones are free of contaminants.


Is the contamination present even in a blank run, that is: no injection, just running through the program? I'd start there.
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