Abstract
A modified null-point potentiometric method and a modified differential potentiometric method are compared with respect to precision with calibration curve method using a new sodium selective glass electrode.The plot of the electrode potential vs. pNa .shows Nernstian response giving a straight line over the concentration range of 10-1 to 10-4 mol/l Na-. The presence of 20-100 times as many potassium and ammonium ions, and more than 1000 times as many calcium ion are tolerated. A PH value does not affect the electrode response at the pH range higher than (pNa+4.5). It is confirmed that the irradiation of ultra-violetlight on the glass membrane does .enot giye a meaningful change in electromotiveforce.Of the three rfiethods tested, the modified differential potentiometric method i-s-.most precise, followed by the modified nuil-point potentiometric method, and then the calibration curve method.
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