by
BMU_VMW » Wed May 21, 2014 12:43 pm
So there is no analytical reason (i.e. contamination, baseline drift etc) to use the septumless injector.
No not really, it has been bought this way to prevent septum bleed. the instrument is used for liq injection, but I'm trying to make a SPME methode for odor compounds and this instrument has al the features I need (triple quad, MPS2, Rxi5silMS column), except an injector with a septum.
is there a compression adjustment for the cylindrical needle seal ? If so you could try to tighten it
The injector 'seals' with a teflon ferrule that is possitioned under a nut that can be tightend. I've already done that to the max. If too tight I risk bending the needle.
You could try threading a septum onto the needle, then adjusting the autosampler VERY carefully to compress the septum against the top of the injector so that it seals above the CIS needle seal.
I don't think this is possible since there is a needle-guide on the autosampler. The needle is not protruding so there is no space to put a septum. It is the needle-guide that is touching the top of the injector.
BMU