AUTOMATED DETERMINATION OF PHOSPHORUS IN SODIUM BICARBONATE EXTRACTS

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Abstract
Ten soil extracts ranging in concentration from 0.07 to 0.91 ppm P were analyzed in duplicate with ascorbic acid and SnCl2 as reducing agents. Results showed average concentrations of 0.333 and 0.335 ppm P with standard deviations of 0.0003 and 0.0005 ppm, when ascorbic acid and SnCl2 were used, respectively. The sensitivity of the method with ascorbic acid was found to be comparable with the chlorostannous-reduced, molybdophosphoric-blue color method. The method can be adapted to read samples as low as 0.01 ppm in P by increasing sample intake and heating-bath temperature, and by reducing the volume of chloromolybdic acid used by increasing its concentration.

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