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- Posts: 4
- Joined: Sun Sep 30, 2012 9:34 am
First sorry for my rookie questions and my english but im not an expert on GC and in english. Im only a user for the last 6 years and only to quantify 2,4,6-Trichloroanisol (ld 0,3 ppt) in SPME. With my Thermo ECD no problems until now. With my agilent 5975C-7890A im having some problems since last 4 months. SIM mode. Main problems: a) RT shift up and down b) poor sensitivity and repeatability c) counts of ISTD peak big variation sample to sample d) on low concentrations (0,3 and 0,5 ppt) no peaks. I change ion (from 195 to 212) it was better at beginning but now its the same....no peaks at these concentrations.
The technical assistance in my country don't know so much to help me. He said it was a dirty source and he clean it. The problem persists. I put new filaments, new liner, septum...basic maintenance. Attached the last autotune and tune to see if you can try to help me. What can i tried to check or do to see if this goes better. Thanks in advance for any suggestions.
http://tinypic.com/view.php?pic=jgpqx4&s=9#.Wnx6dGa5yCQ
http://tinypic.com/view.php?pic=16lbhck&s=9#.Wnx6s2a5yCQ