How to choose tune type?


We have a 5977 extractor source GC/MS SQ, and would like using for DCM extractable open characterization (Open Scan). I Just wonder which tune type would be better fit? EPA method 8270E recommend tune types that can generate spectra matching DFTPP criteria.

My collogue insist on using Stune (see attached file from manual),  but when I use Stune Type , it is hard to pass DFTPP. Also Stune has lower sensitivity than Etune.

Etune can pass DFTPP easily and have higher sensitivity. But the fragment (iron) ratio seams a bit off the spectrum in NIST library. ( see the attached figures).


It will be very appreciated if you can give me a recommendation on tuning type for open scan.



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