Investigations of pentachlorophenol (PCP) degradation using both biotic and abiotic methods have been extensively studied. Due to the hydrophobic nature of PCP and its toxicity, the performance of the biotic treatments varies from site to site and is not satisfactory in most cases. An abiotic method for oxidative PCP degradation in soil under unsaturated conditions and a neutral pH was found. Hydrogen peroxide was used as an oxidant and heme as a catalyst. A mechanism was proposed to describe the possible reaction of heme and peroxide at the presence of PCP. In order to ensure that heme and peroxide are the most important factors during the reaction, two screening tests were run. In order to find the best conditins of PCP degradation using beme and peroxide, a statistical technique, so-celled response surface methodology (RSM), was employed and the best conditions for PCP degradation in soil were determined. In order to examine the rate and extent of PCP degradation kinetic studies were conducted and the results showed that about 70
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