I'm looking for the USP residual solvent chapter testing. Any Agilent part number?
Sorry not ask correctly. I'm looking for a GC Liner for the USP Residual Solvent test.
I have updated the tags on your post and will share it with the consumables forum.
USP 467, the residual solvents method, is a headspace method, so you don't need a liner dependent on your system. If the injection volume is applied by syringe any single-tapered liner will do. Glass wool is not needed for gaseous injections.
Without knowing the system you use we cannot give you a part number.
Thank you for your quick response.
As you said we are using a GC Agilent 7890 with a Agilent headspace. We have an issue with the RSD. The first 5 injections are really good but after inject a sample the next STD injection to close the run with a STD one of the solvent peak fail the %RSD established (NMT 15%). Actually the signal for that peak is to low. basically at the noise level.
Did you think that the issue is because we are using a Liner for the testing?
difficult to say, but try a liner without glass wool, preferably an Ultra Inert one with single taper. It can also be an issue of the syringe, depending on the type of solvent and the incubation temperature.
Normally if the solvent peak size is impacted, it has to do with the injection itself.
But if we are using an Agilent Headspace with a transfer line direct to the GC injection port. (We not use syringe). We have to use the Ultra Inert liner?
Thank you for your support.
Then the transfer line goes directly into the inlet valve and no liner is necessary. The sampler's user manual would describe that perfectly.
What type of inlet do you have? You will need an inlet liner unless your inlet is a Volatiles Interface. For USP 467, it is more common to use a Split/Splitless inlet. In that case, we generally recommend a narrow ID liner for low split ratios (Class 1, 2) and a standard split liner for larger splits (Class 2, 3).
A recently released app note done on the 7697A/8890 recommends p/n 5181-8818 (https://www.agilent.com/cs/library/applications/application-residual-solvents-8890-GC-5994-0442en-agilent.pdf )
Another one done several years ago on 7697A/7890A recommends the UI low pressure drop, p/n 5190-2295, although the chemist removed the glass wool.
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