Reduction of periodate ion by o-anisidine - Application for microgram determination of periodate

摘要

The progress of Mn-II catalysed reduction of periodate by o-anisidine in acetone-water medium was followed by monitoring the increase in the absorbance of reaction intermediate. The reaction was found to be first order with respect to catalyst, substrate and oxidant each. The main reaction product characterized on the basis of melting point and spectroscopic studies, is methoxy-1,4-benzoquinone. The effect of pH, dielectric constant of medium and free radical scavengers were studied to develop the best fit conditions for developing a new and simple kinetic-spectrophotometric method for microgram determination of periodate in the range 3.82 to 101.72 mu g/mL. The characteristics of various calibration curves, percentage recovery, effect of interferrants, correlation coefficient and comparison with other reported methods are presented.