Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1995-03-06
1996-11-26
Bell, Bruce F.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
43 73, 43 74, G01N 2726
Patent
active
055781780
ABSTRACT:
A mercury drop arrangement tests electrochemically a sample solution, in a horizontal or vertical orientation, employing mercury which is delivered from a mercury reservoir to the test solution via a valve and mercury capillary tube. The mercury is valved to deliver one drop of mercury to the end of the capillary tube which is immersed in the sample solution. An electrochemical test of the sample solution can be performed when the mercury drop is in place, and if the mercury drop is not in place, the mercury in the capillary tube forms a microelectrode. The mercury capillary tube can easily be removed for replacement or cleaning when the valve is closed. Closing of the valve produces electrical isolation of the reservoir contents from the mercury in the mercury capillary tube, including the mercury drop itself. Such electrical isolation from the mercury reservoir precludes electrical noise generated in the reservoir from contaminating the voltammetric data. Environmental concerns are addressed by the invention in that mercury consumption is reduced, and operator exposure to mercury is eliminated. In addition, the invention facilitates remote control over the mercury electrode, and therefore is particularly adapted for monitoring harsh environments. Very small capillaries can be employed in the practice of the invention, and pressurization of the mercury reservoir facilitates initialization of the mercury electrode arrangement, and to prevent entrapment of air.
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Catalog: Analogue Instruments for Polarography and Voltammetry by Metrohm.
Analytical Instrument Systems, Inc.
Bell Bruce F.
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