Allow the light petroleum to evaporate from thesample, which is then extracted by direct treatment consisting in soaking the specimen in water at room temperature for one hour and then soaking it in water at 65 ± 5 °C for a further hour, agitating the liquor from time to time.
Pustite, da lahki bencin izhlapi iz vzorca, nato pa snovi izločite z direktno obdelavo, ki jo sestavljata enourno namakanje vzorca v vodi pri sobni temperaturi in nato še enourno namakanje v vodi pri temperaturi 65 ± 5oC, pri čemer vodo od časa do časa pretresite.