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Environmental fate & pathways

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Vanadyl pyrophosphate is a catalyst with a low water solubility of approx. 12 mg/L. The substance is thus considered to be stable in the aquatic environment. Based on the hydrolysis study of VO2 from Wehrli et. al(1989) and the first equilibrium constant for the reaction of P2O74- in aqueous solution at pH 2 to 9 (Crowther, 1953), the hydrolysis half-life of dissolved (VO)2P207 will be one year or greater in nature water even at low pH. Therefore the rate of hydrolytic reaction of the catalyst is slow enough that significant breakdown is not important under normal environmental conditions.

The measured octanol/water partition coefficient (log Pow = -2.0) is very low, thus testing of the adsorption and desorption behaviour of the substance does not need to be performed. As the substance is inorganic, the biodegradation in water is also not considered.