Contamination of soil and groundwater can pose a risk to human health and ecosystems. For this reason, many techniques have been applied to remediate these areas in order to restore natural characteristics as closely as possible. One of these is in-situ chemical oxidation. This technique consists of applying an oxidizer that reacts directly with the contaminants present in the underground environment. As there is a great deal of chemical interaction, knowledge of both the soil, through good chemical and physical methods, and the reagent is indispensable if the expected result is to be achieved.