Pipette 2 ml of the sample filtrate into each of two 25 ml graduated flasks, and 2 ml of the blank test filtrate into each of two other 25 ml flasks.
Kahte 25 ml mõõtekolbi viiakse kummassegi pipetiga 2 ml proovi filtraati ning kahte teise 25 ml mõõtekolbi kummassegi 2 ml pimekatse filtraati.