pyrolysis-GC/MS sytem

[s2008]

Hi all,

we currently bothered by persistent high BP hydrocarbons carry-over in the pyrolysis-Gc/MS system.

Normal high temperature baking did not work well. Has anybody same experience ?


Thanks

[HbJ]

Please give us details about pyrolysis unit (CDS, Target etc.), your GC conditions, samples etc.

[Don_Hilton]

Is the carry over from the pyrolysis unit or in the GC?

[s2008]

Thanks for your concerns.

For sure we knew the carryover did not come from GC sytem.

The weird thing is that there no any carryover when we ran blank ( no real sample and other same as parameters as running samples).

we are using polyetheylene as QC and the carryover appeared from high BP range.



Thanks

[Don_Hilton]

A bit more detail would be helpful. You have no carry over when you run a blank but you have carry over? Please descrive the sequence of runs. What was put into the pyrolisis device and what the chromatograpich result was -- no response, expected response, carry over, etc.

If you will tell what pyrolysis device you use, perhaps someone will recognize the device and perhaps the problem.

[pooch]

Do you use a quartz tube with a filler for your pyrolysis?
It will be useful to know your pyrolysis system (chamber, curie point...)
But maybe your problem is now resolved...