What is the goal of using PTFE as a sampling device material in groundwater testing?

Using PTFE (Polytetrafluoroethylene) as a sampling device material in groundwater testing serves the important purpose of preventing chemical reactions with the samples. One of the core principles in groundwater sampling is to avoid altering the chemical composition of the sample during collection and storage. PTFE is chemically inert and resistant to a wide range of substances, including corrosive and reactive chemicals commonly found in groundwater. This property is crucial in ensuring that the integrity of the groundwater sample is maintained, allowing for accurate analysis of its composition upon testing.

While other materials might react with contaminants or interfere with sample integrity, PTFE provides a reliable option that does not leach harmful substances into the sample or interact chemically with the constituents of the groundwater, ensuring that the measured results reflect the actual conditions present at the sampling site.