Detection and measurement of heavy metals
US5391270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed herein is an improved method for measuring the presence and amount of a variety of metals contained in a sample. In the first step, all of the various forms of each metal are converted to a soluble metallic complex which is capable of being electrochemically reduced. Voltammetry is then used to determine the stripping current or charge characteristic of each metallic complex. Finally, the concentration of each metal can be calculated by insertion of the stripping current or charge value into an equation which correlates peak current or charge values with metal concentration. The metals which can be detected and quantified by using this method are gold, silver, bismuth, cadmium, thallium, and mercury.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.