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' tb 134 Page 1 of 2 <br /> Basic Theory on the Disposition of <br /> Compounds <br /> 1 <br /> Basic Chemistry <br /> Oxygen Release Compound (ORC®), is a proprietary formulation of magnesium peroxide ORC is "oxygenated <br /> magnesia"which gives up the oxygen upon contact with water Magnesium peroxide is converted to magnesium <br /> hydroxide(Mg(OH)2)as oxygen is released This also is the fate of the magnesium oxide which simply hydrates to form <br /> the hydroxide The reactions are <br /> Mg02+H2O --* 112 02 +Mg(OH)2 , and <br /> MgO+H2O i Mg(OH)2 <br /> Therefore, the uniform endpoint of ORC, from both compounds is magnescum hvdroxide The safet} of this material is <br /> . easily conveyed by the fact that a suspension of magnesium hydroxide in nater is ordinary Milk of Magnesia <br /> I <br /> /Free Magnesium <br /> I Levels of free magnesium corning from ORC or magnesium ltydro\tde are not a probletn Both magnesium peroxide and <br /> magnesium hydroxide are virtually insoluble(Ksp= 1 8 X 10-1 1) Additionally,because ORC is contained in a filter <br /> sock, the magnesium is contained and removable Small particles of a few mucrons in diameter could leave the sock and <br /> I be carried a limited distance in the sub-surface, before becoming part of the soil matnx The compounds are simple <br /> minerals Microorganisms can metabolize these compounds using their internal organic acids to solubrlrze them <br /> 1 <br /> Free Phosphate <br /> ORC contains up to three percent of food grade potassium phosphate The phosphate is specifically KH2PO4, also <br /> known as monopotassium phosphate or MKP and/or K2HPO4 which is drpotassrum phosphate or DKP The <br /> concentration cited is intimately bound to the crystalline structure of magnesium peroxide Some may eventually be <br /> released since the potassium phosphates are water soluble <br /> Even though a portion will remain with the spent product, to be consen ative we may assume it will all be released If <br /> this is the case one has to evaluate the total volume of natcr that will solubilize the extant phosphate in order to derive <br /> a concentration that could permeate the aquifer It can be easily shown (fiat the amounts fall below 1 ppm in the <br /> immediate vicinity of the source well <br /> Qualitatively, several points should be made with respect to the benign nature of the phosphates in question First, they <br /> http //www regeneshis com/QRCtech/Tb 134 htm 6/20/01 <br />