Monitoring Aquatic Contaminants with Time-averaged Concentrations by Programmable In Situ Extraction
October 27 at 2 PM Eastern
The potential for time-dependent changes in environmental contaminant concentrations has long been recognized as a source of error in contaminant characterization. Under ESTCP Project ER-201122, we have developed a programmable, submersible in situ sampler (IS2) that takes multiple, simultaneous composite samples to provide time-integrated average concentrations over periods of minutes to weeks, with the sampling rate mechanically determined, for consistency across compounds and for improved precision. In situ extraction of large volumes of water favors low method reporting limits, while minimizing the volume of contaminated material removed from a site. The sampling media are commercial off-the-shelf or custom solid phase extraction (SPE) cartridges, enabling rapid method development.
In this webinar, we provide an overview of this in situ water extraction technique, its potential applications, costs, advantages and limitations. A case study is presented for a coastal aquifer with a demonstrated diurnal concentration cycle for the contaminant of concern, chromium-VI.
The webinar will provide an overview of using active samplers such as the IS2 technology. It should be of particular interest to practitioners, environmental consultants and scientists, risk assessors, field personnel, regulators, and other stakeholders concerned with the determination of groundwater-borne contaminants of concern.