Submitted to: Organic Agricultural Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 9/8/2004
Publication Date: 6/30/2004
Citation: Bissey, L., Watts, R., Smith, J.L. 2004. Natural oxidant demand on various modified fenton¿s reagents. Organic Agricultural Conference Proceedings.
Technical Abstract: Little is known about the natural oxidant demand (NOD) that soil matrix interactions exhibit on modified Fenton's reagent. Some studies indicate that the susceptibility of chemical oxidation of PAH is a function of total organic carbon in high carbon systems (>5%). However, there is also evidence that any increase in scavenging of OH· by peat is insignificant compared to the scavenging by the H2O2 in the system. Reactions may even accelerate when there is increased iron or iron availability or an decrease in pH in the presence of humic material. The goal of this research was to determine the effects of Fenton's reagent on different pools of carbon in order to increase knowledge of the natural oxidant demand of various Fentons processes. The objectives of this research were to quantify carbon pools based on grain size separation and to quantify changes in carbon pools after reactions containing various Fenton's reagents. Modified Fenton's reagent has become increasingly popular for treating contaminated soils and groundwaters. Along with ozone, persulfate, and permanganate, Fenton's reagent has become a commonly used in-situ chemical oxidation treatment. Modified Fenton's reagent is based on the standard Fenton's reaction, in which dilute hydrogen peroxide is slowly stirred into a degassed solution containing dilute amounts of iron (II). This procedure produces hydroxyl radicals (OH·) in the approximate quantities: