COMPLEXYMETRIC AMPEROMETRY IN THE DETERMINATION OF TUNGSTEN IONS IN THE ENVIRONMENTAL OBJECTS

The work shows the suitability of amperometric titration of tungsten with thiourea in a wide range of their concentrations, and with an appropriate selection of determination conditions, it becomes sensitive and highly selective. It was found that the curves that are optimal in shape and the best titration results are observed at a potential difference (E = 0.75 V) on the indicator electrode with the lower limit of the determined tungsten content equal to 10 μg in 10 ml of the investigated thiourea solution.