Alkali Degradation of PCB Congeners in Sewage Sludge.
Alkaline saponification of sewage sludge may lead to the degradation of PCB's with five or more chloro-substituents, HCB and DDE. Refluxing sewage sludge with 2N KOH in methanol of 6 hours did not cause degradation at 50+?C, reduced the concentration of hepta- to deca-CBs with approx. 50% at 70?C, and even more at 90?C. Refluxing with 4N KOH in methanol for 6 h efficiently eliminated hepta- to deca-CBs, reduced hexa-CBs with around 50% and penta-CB-s with around 30% HCB was degrades faster than PCBs, whereas DDE was similar to penta-CBs.
RAHMAN Mohammad Saifur;
PAYA-PEREZ Ana Beatriz;
LARSEN Bo Richter;
1997-08-11
JRC14910
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