| Use: | Determination of metals in soils and water. |
Description:
Anodic stripping voltammetry (ASV) is an electrochemical technique in which information about an analyte is derived from the measurement of current as a function of applied potential. The measurement is performed in an electrochemical cell under polarizing conditions on a working electrode, which is normally a mercury or gold film-coated, glassy carbon electrode. Analysis involves a two-step process consisting of electrolysis and stripping steps. The analyte of interest is reduced and collected at the working electrode and then stripped off and measured. The reduction step is much longer than the stripping step, and the increase in the signal to noise allows low concentration solutions to be measured. The advantage of ASV is the ability to distinguish between different oxidation states of the same metal. Anodic stripping voltammetry, along with similar potentiometric techniques (including constant current stripping voltammetry and cathodic stripping voltammetry), has been used for measurement of trace levels of a variety of metals.
Analytes:
7. Metals
Media:
| Soil/Sediment | Water | Gas/Air |
| Requires extraction to liquid phase | BETTER | Requires extraction |
| Selectivity: | Technique measures the contaminant directly. |
| Susceptibility to Interference: | Medium. |
| Detection Limits : | 100-1000 ppb (soil); 1-50 ppb (water). |
| Turnaround Time per Sample: | Minutes. |
| Applicable To: | |||
| Screen/Identify | Characterize Concentration/Extent | Cleanup Performance | Long-Term Monitoring |
| ADEQUATE | BETTER | BETTER | ADEQUATE |
| Quantitative Data Capability: | Data is quantitative. |
| Technology Status: | Commercially available technology with moderate field experience. |
| Certification/Verification: | Technology has not participated in CalEPA certification and/or CSCT verification program. |
| Relative Cost per Analysis: | Mid-range expensive. |
Limitations:
EPA Methods:
| 7063 | Arsenic in Aqueous Samples and Extracts by Anodic Stripping Voltammetry (ASV). |
| 7472 | Mercury in Aqueous Samples and Extracts by Anodic Stripping Voltammetry (ASV). |
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