Chemcatcher® is a highly versatile and cost-effective passive sampling device for monitoring a wide variety of pollutants in potable, surface, coastal and marine waters. It is now being used worldwide to help solve a number of water quality issues. Chemcatcher® was developed through a number of projects funded by Framework Programmes of European Community by Professors Richard Greenwood and Graham Mills at the University of Portsmouth (UK) and Professor Greg Morrison at the Chalmers University of Technology (Sweden).
Most monitoring programmes involve the periodic collection of low volume spot samples (bottle or grab) of water. Obtaining representative data on the concentration of chemicals present can be challenging using this approach, particularly where levels fluctuate over time and when chemicals are present only at trace, yet toxicologically relevant concentrations. The use of passive samplers can help to overcome this problem as they can be deployed in the water column for days to months.
Chemcatcher® measures time-weighted average (TWA) or equilibrium concentrations of pollutants in water. It may also be used in a forensic mode for the qualitative screening of the presence or absence of specific substances of concern. Information obtained from the use of the device allows the end-user to gain a better indication of the long-term or appertaining environmental conditions and can therefore assist in improving risk assessments and in guiding any remedial actions.
Chemcatcher® comprises a robust, low-cost reusable three-component water-tight PTFE body that is used together with a specific receiving phase and diffusion-limiting membrane. Two designs are available to accommodate different types of commercially available 47 mm diameter receiving phase disks. The use of commercially available products allows for high reproducibility and the use of standardised preparation and extraction procedures. By altering the combination of the receiving phase and the diffusion limiting membrane used, Chemcatcher® can be deployed for the detection and monitoring of non-polar organic compounds, polar organic compounds, metals, nutrients, organo-metallic compounds and radionuclides.
BENEFITS OF USING CHEMCATCHER®
Easy to deploy in the field
Cost effective as the PTFE body is reusable
Capable of measuring a wide range of environmental pollutants
Technology validated by world-leading academics
Once calibrated gives time-weighted average concentrations of chemicals
Can detect pollutants present at low concentrations