Decomposition oxygen availability

The catalytic properties of TS-1 appeared to be unique. In oxidation reactions, with H202 as the oxidant, many organic compounds could be oxidized selectively and efficiently. Partial oxidation products could be obtained in high yields, and almost all the oxygen available from H202 was used to produce the desired compounds, with only slight decomposition to give H20 and 02 (Neri et al., 1985, 1986 Romano et al., 1990). 

Physical protection is exerted by occlusion of particulate organic matter (POM) inside aggregates. It is responsible for the physical separation of organisms active in decomposition and substrates, reduced oxygen availability in the substrate compartment, and reduced biomass turnover through protection from microbial grazers (Mamilov and Dilly, 2002). 

The radicals are then involved in oxidations such as formation of ketones (qv) from alcohols. Similar reactions are finding value in treatment of waste streams to reduce total oxidizable carbon and thus its chemical oxygen demand. These reactions normally are conducted in aqueous acid medium at pH 1—4 to minimize the catalytic decomposition of the hydrogen peroxide. More information on metal and metal oxide-catalyzed oxidation reactions (Milas oxidations) is available (4-7) (see also Photochemical technology, photocatalysis). 

Once in the soil solution, urea—formaldehyde reaction products are converted to plant available nitrogen through either microbial decomposition or hydrolysis. Microbial decomposition is the primary mechanism. The carbon in the methylene urea polymers is the site of microbial activity. Environmental factors that affect soil microbial activity also affect the nitrogen availabiUty of UF products. These factors include soil temperature, moisture, pH, and aeration or oxygen availabiUty. 

---