Headspace syringe

[Irina]

Hi everyone,
How can I check a headspace syringe? How can I be sure that gas will not evaporate between plunger and syringe wall?

[LCbob]

Hi

I assume you mean the volatiles escaping via the syringe plunger tip.

What equipment do you have? If in doubt replace it and run some qualification tests.

[Irina]

Hi LCbob,
I have a GC-ECD 2010 from Shimadzu with AOC-5000. I replaced the syringe because it was dirty and I was wondering if I can reuse this one after washing it and how can I check if the volatiles are escaping.
Qualification tests means to do an injection of a known concentration standard and check it on calibration curve?

Irina

[Peter Apps]

Hi Irina

Pull back the syringe plunger, stick the end of the needle into an old inlet septum or headspace septum so that the tip is sealed. Push on the plunger - if the syringe is leaking the plunger will move down.

Peter

[Irina]

Thank you Peter