Many thanks for your suggestions so far! I forgot to mention that (except to my normal behavior in the methods +reagents realm where I like to suggest homebrew), this time I am in need of a solution that does not require any calibration etc. etc. I need reproducibility. I wondered if there was any commercial alternative to PD-10, preferably even of the same dimensions (although this wouldn't be a problem as long as they are similar scale and have a frit on top). I searched the web, of course, but haven't found any alternative. .
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