Voltammetry is a category of electroanalytical methods used in analytical chemistry and
various industrial processes. In voltammetry, information about an analyte is obtained by measuring the current as the potential is varied.
One of the characteristics of voltammetry is its high sensitivity and interferences caused by high concentrations of dissolved solids, low purchase price and easy operation.
There are many types of voltammetry, however Modern Water uses Adsorptive stripping voltammetry - A quantitative, analytical method for trace analysis. The analyte is deposited simply by adsorption on the electrode surface (i.e., no electrolysis), then electrolyzed to give the analytical signal. Chemically modified electrodes are often used.
What is Modern Water’s solution?
Our systems use solid state electrodes to perform voltammetry for the analysis of metals
Our trace/ heavy metal product range includes the portable PDV6000ultra and the two on-line, continuous systems: the OVA7100 and OVA7100 Dual Cell. Our technology is robust and reliable, can be operated by technicians anywhere in the world and is relatively low maintenance.
The portable, laboratory and online systems have a worldwide reputation for quality, reliability and ease of use, enabling customers to monitor pollutant levels, optimise their processes, minimise damage to the environment and protect the health of employees and communities at large.
How does voltammetry compare?
While Atomic absorption spectroscopy (AAS) and Inductively coupled plasma (ICP) are very widely used and have some advantages, in many situations, voltammetric methods are more suitable.
Voltammetry is a much more cost effective method as;
- Voltammetry does not need expensive infrastructure such as fume extraction, cooling water supply, greatly lowering running costs.
- Voltammetry instruments are cheaper than AAS and much cheaper than price of ICP.
- Voltammetry does not need expensive consumables such as ultra pure gases or lamps.
- Voltammetry does not need to be started and stabilised for hours before first analysis.
Our systems use a solid state electrode (non-mercury) to perform Anodic stripping
voltammetry for the analysis of metals in solution. The technology is robust and reliable, can be operated by technicians anywhere in the world and is relatively low maintenance. It has a superior performance to other methods because;
- It has lower detection limits than standard AAS. Low ppb levels detectable for most metals and sample types. Sub ppb levels often possible with appropriate reagents & environment
- Speciation ability. More toxic forms are typically more easily measured by Voltammetry
- Voltammetry is not adversely affected by chloride, magnesium, calcium etc. allowing direct analysis of estuary, sea and other waters which require treatment for AAS or ICP analysis.
- Voltammetry is ideally suited to on site and on-line use.
- Academic research
- Monitoring at remote locations
- Contaminated land remediation
- Food and feed analysis
- Tracing contamination back to source
- Accidental contamination events
- Monitoring of rivers, lakes, reservoirs, seawater
- Industrial effluent monitoring
- Groundwater monitoring/natural attenuation
- Wastewater recycling and WWTP influent monitoring
- Drinking water intake and distribution