Absorption coefficient

[smartin]

Hi!!!

I'd like to know the "absorption coefficient" of some drugs in order to, through the Lambert-Beer law, calculate the "real" concentration of my solution.
Could somebody recommend me some web where to found the "absorption coefficient" of the substances???

I'll wait for it!!

Thanks a lot!!

[Gerhard Kratz]

Look for the monographs in USP, EuP for example, or search by CAS# and look for the MSDS from the manufacturers.

[smartin]

Thank you very much.
but if it is not there....

[HPLCaddict]

What about measuring it yourself using reference standards?

[smartin]

Yes, of course.
But I would like to have them in order to check some old solutions already prepared.... in a quickly way...