Chemstation integration over wide time areas

[Larry Ellison]

I’m trying to set up a method for the quantification of Diesel fuel, using an FID, over a timed range (c10-c24) using MSD Chemstation D.01. I have made a compound that extracts signal from the time of my alkane carbon markers (3.00 min to 9.480 min). The data system does a good job with the starts and stops for collecting the signal but where it applies the horizontal baseline seems to vary a lot. Sometimes the integrator skims along the top and sometimes it draws all the way down to the bottom of the Qedit window, this results in huge quanitation differences. When I go to draw a manual baseline in Qedit the window does not let me zoom out so it is difficult to know where to apply the right height for the baseline, i.e. I can’t see the whole chromatogram’s natural baseline so it is hard to follow it along. So my questions are:
1. Does anyone know how to set up MS Chemstation to reliably and consistently apply a baseline over a large timed range?
2. Does anyone know how to zoom out or scroll the x-axis in Qedit? It is easy to zoom out when looking at MS data (left click), but in GC data it is static.
Thanks in Advance

[ea123]

Hi Larry,

I'm trying to tackle the same issue with integration of DRO using Chemstation. Did you ever find an answer to your question?

Thanks,

Todd