Kinetic-Spectrophotometric Determination of Mn II in Nanograms Based on its Catalytic Effect on Periodate Oxidation of 2-amino-m-xylene.

The progress of Mn II catalysed periodate oxidation of 2-amino-m-xylene in acetone-water medium was followed by monitoring the increase in the absorbance of reaction intermediate. The main reaction product is 2,6-dimethyl-p-benzoquinone. The reaction was found to be first order with respect to catalyst, substrate and oxidant each. The conditions were developed for kinetic-spectrophotometric determination of Mn II in the range 107.88 – 1294.56 ng/ml. Molar extinction coefficient and Sandell’s sensitivity for various calibration curves developed are respectively, 57500 to 68100 L. mol -1