James, cjm, et al;
Thanks for the thoughts, I've been dragged into other projects and am just now coming back to this one. I haven't installed a new drawout plate yet. Tailing is significant enough to cause calibration issues with indeno(123-cd)pyrene and dibenz(ah)anthracene; the former tails into the latter, artificially inflating the higher cal points and throwing %RSD out of range for 8270. Narrowing the calibration range is an option for now, but I'm worried that the tailing will quickly get out of hand and affect separation of other compounds once we start running samples.
Conditions:
Column- Restek Rxi-5sil MS, 0.25mm, 0.25 um film, 30m w/ 5m guard
Constant flow mode at 1.2 ml/min (helium carrier)
Avg velocity 40 cm/sec
Inlet 290 C, drilled uniliner, no wool, 9.78 psi
Purge flow 60 ml/min
Purge time 0.15 min
Total flow 64.2 ml/min
1 uL injection
Oven program:
Init temp 50 C
Hold 0.5 min
15 C/min to 270 C
5 C/min to 320 C
(25.17 total run time)
MS transfer line 290 C
MS source 230 C
MS quad 150 C