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Integration of blank in DataApex Clarity

Discussions about chromatography data systems, LIMS, controllers, computer issues and related topics.

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We are trying to calculate LOD/LOQ for a chromatography sample using the method in Harris Quantitative Chemical Analysis: measure 7+ blanks and 7+ samples of low concentration and the signal detection limit is (average of the blanks) + 3*(standard deviation of samples).

This is simple enough, but I can't figure out how to get Clarity to allow me to integrate the blank signals. I can make a new peak and it will often allow me to do so, but it won't let me place the starting and ending points where I want them to be.

Anyone have any thoughts on how to get Clarity to do this? If not, is there free and/or open source software that will do so?

Thank you!
Mark
I think the integration in Clarity suffers from the lack of a click-drag-unclick option. There are buttons for setting the start and end of a peak, but I can't remember what they look like... I think there is also a setting for minimum peak size.

But shouldn't your blanks be clean enough that there's essentially just a flat line with nothing to integrate? Thus all the results would be non-detect and there'd be nothing to use. Blanks are useful for figuring out the MDL in methods where you always get some kind of number. But if the software and/or user is never going to integrate a little noise peak and call it a hit, then using those peaks to figure out MDL is not really useful. If you are getting peaks large enough to integrate, could you eliminate them somehow?
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