Accession Number : ADD002118

Title :   Anodic Stripping Voltammetry and Apparatus Therefor.

Descriptive Note : Patent,


Personal Author(s) : Lieberman,Stephen H ; Zirino,Alberto

Report Date : 09 Sep 1975

Pagination or Media Count : 12

Abstract : An apparatus for and a method of determining the presence and concentration of trace metals in seawater relies on anodic stripping voltammetry. A tubular mercury-graphite electrode is suitably coupled to receive a flowing mercury plating solution and a thin film of mercury is deposited on the inner surface of the electrode when a plating potential is coupled to the electrode. Next, a seawater sample is pumped through the electrode and trace metals are reduced onto the active mercury film when the plating potential is reconnected to the electrode. A following analysis merely calls for switching the seawater sample back to a container and reconnecting the mercury plating solution to the electrode. Thus, the disclosed method and apparatus are capable of nearly real-time iteration to enable a more accurate determination of trace metal concentrations. The degree of accuracy is enhanced since the flow rates of the plating solution and the sample are controlled, the magnitudes of the plating and stripping potentials are controlled and the thickness of the active mercury film is precisely regulated to ensure consistent parameters for a number of sample analyses.

Descriptors :   *Patents, *Trace elements, *Sea water, *Metal detectors, *Polarographic analysis, Concentration(Chemistry), Electrodes, Monitoring, Solutions(Mixtures), Plating, Electrodeposition, Plating, Laboratory equipment, Performance tests

Subject Categories : Physical Chemistry
      Physical and Dynamic Oceanography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE