USE OF REVERSED-PHASE HPLC WITH SOLID-PHASE EXTRACTION FOR MONITORINGOF RADIOLYTIC DEGRADATION OF CHLOROPHENOLS FOR ENVIRONMENTAL-PROTECTION

The efficiency of radiation induced decomposition of chlorophenols dep ends substantially on the radiation dose used and the presence of spec ific scavengers in the irradiated samples. Due to the use of HPLC for decomposition control it was shown, for the first time, that the incre ase of radiation dose results in gradual elimination of chlorine atoms from the chlorophenols molecules. The efficiency of radiolytic degrad ation of phenol and chlorophenols was monitored by reversed-phase HPLC . Prior to the chromatography the products of radiolytic degradation w ere preconcentrated using solid-phase extraction with phenyl columns. The most difficult to decompose is the simple phenol, which is also a product of radiolysis of all chlorophenols. Doses up to 2.0 kGy have n ot decomposed it completely in experimental conditions used. Degradati on of chlorophenols in synthetic aqueous solutions takes place at dose s from 0.2 to 2.0 kGy at ppm level of substrates depending on the numb er of chlorine atoms in molecule, however, for river water matrix cont aining scavengers such as carbonates or oxygen it requires larger dose s.