How we can increase the conc. of solution after the desorption experiment. For example. doing the Adsorption process using activated carbon on a lab-prepared IBuprofen solution. Then after the desorption of IBP compounds from the adsorbent (AC), trying to concentrate the solution to measure in the instrumenttry because they are in very low conc. in the environment. First, try this in a lab, and then will try it with real polluted surface water. The idea is to separate pharmaceuticals from water and detect, the challenge is their low concentration.
Solid Phase Extraction - Try the Waters Oasis HLB 6mL cartridge part # 186000115
Elute with methanol, then concentrate the extract down using nitrogen gas (Turbo-Vap or other concentrator like roto-vap etc.)
The adsorption effect of activated carbon is poor, so it is suggested to use diatomite filler for the test.
I think the desorption process is not correctly done. IBP molecules are still stiking in the AC particules. You shoud choose an appropriate solvent for IBP to remove it from AC surface to the solution (solvent) . In this case you can have enough IBP and its concentration will easily detectable.
I hopr this will help you. Good luck
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