A 1-g/L two-phase mixture of the commercial PCB oil Aroclor 1242 in acidified water at 66°C was degraded by a photoassisted Fenton-type reaction consisting of Fe3+, H2O2, and UV light (300-400 nm). Up to 88% PCB removal and 85% dechlorination were obtained, without attempts at optimization. The order of reactivity was di- > tri-> tetra- - – higher chlorinated biphenyls, but the selectivity was weak. Perfluorinated surfactants added to increase PCB solubility or rates of dissolution had a detrimental effect on degradation. Minimal reaction was observed at room temperature.
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Pignatello et al. (1994) studied this question.
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