Abstract
AbstractThe photochemical reaction between poly(vinyl alcohol) (PVA) and chromate ion in aqueous solution has been studied by ultraviolet spectroscopy and electron paramagnetic resonance (EPR). The first step of the reaction appears to be formation of a PVA‐chromate ester. No further detectable chemical changes occur unless the ester is irradiated. Spectral sensitivity data indicate the reaction is initiated only by the chromate ester charge transfer absorptions at approximately 370 nm and 450 nm. EPR indicates an equilibrium concentration of Cr (V) during irradiation arid a decrease in concentration of Cr(V) following second order kinetics upon cessation of irradiation. The final reaction product is Cr (III) complexed with the hydroxyl groups of the PVA. The reaction rate is a function of pH between pH 12; however no detectable reaction occurred above pH 12. A mechanism is proposed for the PVA‐chromate photoreaction in solution.
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