Volume 46, Number 5  (September - October 2001)

Key words: 

The results of investigation of the effect of separation method on the recovery of selected polycyclic aromatic hydrocarbons (PAH) from digested sluge are demonstrated. The results of comparison between four separation methods: flocculating agent, methanol and chloroform and anhydrous Na₂SO₄ addition as well as a freezing are presented. Mechanical shaking (120 min, 500 rev min^-1) and ultrasonic extraction (10 min) were used in order to remove PAH from sluge. The 1:5 (v/v) methanol-cyclohexane mixture was used as a solvent. The extracts were purified with solid phase extraction and analysed for 16 EPA-PAH by GC-MS. The PAH recovery from sluge was visibly dependent on separation method. The highest PAH concentration were obtained using nahydrous Na₂SO₄. Flocculating agent addition and freezing were not useful.