Abstract
The determination of thiourea by direct potentiometric measurement and by potentiometric titration with silver nitrate, by means of a sulphide-selective electrode is described. The lower limit of determination in direct potentiometry is 10 -6 M thiourea. Titrations can be successfully performed down to 10 -3 M concentration. Two jumps appear on the titration curve, the first corresponding to the formation of silver sulphide and the second to the precipitation of silver cyanamide. Elemental and infrared analysis of the products of titration confirm the formation of silver sulphide and silver cyanamide.
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