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ORC TECHNICAL BULLETIN # 111.2 <br /> Oxygen Release Compound,ORC° <br /> Basic Theory on the Disposition <br /> of Compounds <br /> Basic Chemistry <br /> Oxygen Release Compound (ORC ), is a proprietary formulation of magnesium <br /> peroxide ORC is "oxygenated magnesia" which gives up the oxygen upon <br /> contact with water. Magnesium peroxide is converted to magnesium hydroxide <br /> (Mg(OH)2) as oxygen is released This also is the fate of the magnesium oxide <br /> which simply hydrates to form the hydroxide. The reactions are. <br /> M902 + H2O -* 1/2 02 + Mg(OH)2 , and <br /> MgO + H2O -*. Mg(OH)2 <br /> Therefore, the uniform endpoint of ORC, from both compounds, is magnesium <br /> hydroxide The safety of this material is easily conveyed by the fact that a <br /> suspension of magnesium hydroxide in water is ordinary Milk of Magnesia <br /> Free Magnesium <br /> Levels of free magnesium coming from ORC or magnesium hydroxide are not a <br /> problem. Both magnesium peroxide and magnesium hydroxide are virtually <br /> insoluble (KSp = 1 8 X 10-'1). Additionally, because ORC is contained in a filter <br /> sock, the magnesium is contained and removable Small particles of a few <br /> microns in diameter could leave the sock and be carried a limited distance in the <br /> sub-surface, before becoming part of the soil matrix The compounds are simple <br /> minerals Microorganisms can metabolize these compounds using their internal <br /> Sorganic acids to solubilize them <br />