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Internal standard (pilot ion) method:
Polarogram of the unknown solution in a supporting electrolyte and gelatin is recorded and to the same solution a standard or pilot ion is added in known amount and current-voltage curve is recorded. The only condition is that ?E1/2 of pilot ion and unknown should be differed through 0.4 V. A ratio of these two waves is compared along with the ratios of known amounts of the two ions previously determined.
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