Lapho sisebenzisa amashubhu wokuhlola ama-COC, sivame ukufaka isampula ukuthi lihlolwe kwishubhu lokuhlola bese linyakazisa ishubhu ngamandla ukuze simise konke ukulamula. Susa i-cap ye-cod test tube bese ufaka ama-2 ml wesampula usebenzisa i-pipette.
Ibanga eliphakeme, ama-oxygen afunwa i-oxygen: Ama-vials agaya amakhemikhali, i-EPE ephezulu i-Oxygen funa (i-COD): I-US EPA evunyelwe indlela yokuhlaziywa kwamanzi asetshenziswayo I-150 \ test iqukethe iMercury.
