Ama-vials wesitoreji esiyisibonelo, esaziwa ngokuthi amabhodlela okugcina amakhemikhali, noma amabhodlela okufaka amakhemikhali, alungele ukupakishwa okungaphansi kwemikhakha ehlukahlukene yezemithi, ama-biological angezwa, neminye imikhiqizo, efanelekile ukugcinwa okuhle kakhulu kwemikhiqizo. Inqubo yokukhiqiza yokusebenza okuphezulu okuphelele kwe-organic carbon (toc) amabhodlela wesampula ahlanzekile ukuze aqinisekise ukuthi awanikeli noma yimuphi umhlangano we-organic carbon kusampula. Lokhu kubaluleke kakhulu ekuhlaziyweni kwe-TOC, lapho ukulandelela khona ukungcola kokungcola kungathinta imiphumela.