Ceramics-Silikáty 34, (1) 69 - 75 (1990)

Two polarographic methods of molybdenum determination in glasses in the range 0.0002 to 0.1 % are described. The first is based on measuring the catalytic current of Mo-reduction by means of fast scan differential pulse polarography on the hanging mercury drop electrode in the medium of sulphuric acid, perchloric acid and sodium sulphate. The second, more sensitive method, utilizes the same technique, but a solution of potassium nitrate and 8-hydroxyquinoline as the medium. Using the methods decribed, amounts of 0.1 to 1 mg l⁻¹ and 1 to 10 μg l⁻¹ respectively can be determined with a relative error which does not exceed 10 %.