Hanging mercury drop electrode capable of automatic control

Details Hanging mercury drop electrode capable of automatic control Hanging mercury drop electrode capable of automatic control

1983-11-29

1985-10-22

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204413, G01N 2734

Patent

active

045486794

ABSTRACT:
A hanging mercury drop electrode is described which makes use of a capillary tube with an inverted-U shape, removably fastened to an air-tight pressure-resistant cylindrical mercury reservoir. The capillary tube has a sufficiently thin inner diameter (0.35.times.10.sup.-2 to 0.5.times.10.sup.-2 cm) and a sufficient length (40 to 50 cm) such that the viscous forces prevent mercury from flowing through the capillary tube, once a height of the mercury head is selected (1 to 2 cm) which roughly counterbalances the back-pressure acting on the drop surface. To increase the drop size, a pressure higher than the atmospheric pressure is transmitted to the mercury reservoir from a pressure generator via an electromechanical valve, which is controlled by a timer or a microprocessor. The drop becomes stationary as soon as the mercury reservoir is connected with the outer atmosphere via another electromechanical valve. A whole cycle of operations of the present electrode comprises: (1) detachment of a preformed drop by a hammer which knocks the capillary tube; (2) growth of a new drop by application of a pressure higher than the atmospheric pressure to the mercury reservoir; (3) blockage of the drop area by application of the atmospheric pressure to the mercury reservoir; (4) desired electroanalytical measurement on the resulting static mercury drop.

REFERENCES:
patent: 2361295 (1944-10-01), Kanner et al.
patent: 2728721 (1955-12-01), Ladisch et al.
patent: 3367858 (1968-02-01), Kurosaki
patent: 3410763 (1968-11-01), Capuano
patent: 3421989 (1969-01-01), Haagen-Smit
patent: 4138322 (1979-02-01), Barnes et al.
patent: 4142944 (1979-03-01), Smith
Schiffrin, J. Electroanal. Chem., vol. 23, No. 1, (1969), pp. 168-171.
Birch et al., Analytical Chemistry, vol. 39, No. 10, Aug. 1967, pp. 1182-1184.
Reprint of Analytical Chemistry, vol. 45, No. 14, pp. 2442-2443, Dec. 1973.

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