Effects of pH and temperature conditions on dechlorination performance in solution phase studies (CMC is 0.5 wt%, [Fe] = 500 ppm, Pd was 0.5 wt% of Fe, [PCB 1]o = 5 ppm). (a) The initial pH 3.5, 7.8 and 9.2 were converted to 3.6, 8.1 and 9.3, respectively. T = 23 °C. (b) Based on the Arrhenius equation, the activation energy of PCB 1 dechlorination was obtained as 26.5 kJ/mol. The initial pH = 7.8.