... adjustment of the pH of the solution was done using 1.0N NaOH and 1.0N H2SO4. The effect of the initial pH of the solution was evaluated using pH values of 3, 7, 5.8 and 10. For the effect of initial ... study, the degradation of polychlorinated biphenyls (PCBs), Aroclor 1260, using the UV/H2O2 system was investigated. The effects of initial H2O2 concentration, initial pH of the solution ... solutions. Effect of Initial PCB Concentration The results of the degradation of PCBs at different initial concentrations are shown in Figs. 6 and 7. In all the initial PCB concentrations...