Bigbear wrote:
How is the sensitivity using the extractor lens for 525?
Running my system w/o the extractor, the lowest I can go is 0.1 ppm. Even then the peaks are not great.
On the 7000 I can take Benzo[a]pyrene down to 0.01ppm with splitless injection using SIM with no problems, I can see it full scan but there is some noise around it. I can get the same sensitivity as I can on the 5975 running SIM for the UCMR4 525.3 analytes which takes alpha-Hexachlorocyclohexane down to 0.003ppm with 1ul splitless injection.
The only exception for the 7000 is that when running 1ml/min helium I have a vacuum of 8^E-7 torr, so that helps with sensitivity also.
The software for the 7000 in Mass Hunter doesn't include a specific autotune macro for DFTPP or BFB so I have to run autotune then manually adjust to get it to pass (but having learned on the 5995 and 5970 I am used to doing it manually). The autotune will give me a m/z 69 abundance of about 10,000,000 counts using the extractor so I normally run with a gain of less than 1.