Chemistry: electrical and wave energy – Processes and products
Patent
1978-03-07
1979-03-27
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204195R, G01N 2742
Patent
active
041464362
ABSTRACT:
A method for electrochemically determining the concentration of heavy metals in water by precipitating the metals at a solid electrode under the influence of a constant negative d-c voltage and subsequently dissolving them by anodic oxidation, in which the metals are precipitated at a platinum metal electrode; the water is then replaced by an electrolytic solution and the precipitated metals are dissolved again by suddenly changing the negative d-c voltage into a constant positive d-c voltage, while the electric charge required for the dissolution is determined and the concentration is determined therefrom; the time of application and the magnitude of the d-c voltage are always kept constant during the precipitation as well as during the dissolution of the metals.
REFERENCES:
patent: 3904487 (1975-09-01), Lieberman et al.
patent: 4058446 (1977-11-01), Zirino et al.
M. Christian Zbinden, Bull. Soc. Chim. Biol., 13, 35 (1931).
Samuel S. Lord, Jr. et al., Analytical Chem., vol. 24, No. 1, pp. 209-213 (1952).
M. G. Tamba et al., J. Electoanal. Chem., 25, No. 2, pp. 235-244 (1970).
C. O. Huber et al., Analytical Chem, vol. 38, No. 1, pp. 128-129 (1966).
Kellermann Walter
Nischik Herbert
Sturm Ferdinand V.
Kaplan G. L.
Siemens Aktiengesellschaft
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