Passive Sampler for PFAS

Until recently, it has been difficult to monitor and measure aquatic PFAS at low, environmentally relevant concentrations, but SiREM’s newest sampler, PFASsive, has changed that.

Addressing PFAS in the Environment

PFASsive is a diffusion-based equilibrium passive sampler that was developed and validated for relevant PFAS (EPA 537, EPA 1633) in porewater and surface water. Upon retrieval, the water from the sampler is treated like a water sample; the PFAS can be concentrated and measured using traditional United States Environmental Protection Agency laboratory methods without the additional extraction steps required for sorbents. The results are presented as concentrations in nanograms per liter (ng/L).
Because the accumulation of PFAS into the sampler is based on how the molecules diffuse into the sampler, the included reverse tracer allows the extent of equilibrium to be determined during deployment and used to estimate the freely dissolved equilibrium concentration in the environment. The freely dissolved equilibrium concentration has been shown to relate better to bioavailability, toxicity, and risk assessment models than concentrations measured from conventional grab samples.

Per- and polyfluoroalkyl substances (PFAS) are a large group of compounds found in consumer products and aqueous film-forming firefighting foams. All PFAS have a strong carbon-fluorine bond that allows them to persist and be transported far and wide in the environment. Until recently, it has been difficult to monitor and measure aquatic PFAS at low, environmentally relevant concentrations, but SiREM’s newest sampler, PFASsive, has changed that.

PFASsive is a comprehensive, equilibrium sampler that measures freely PFAS in sediment and soil porewater, surface water, and stormwater.

Because the PFASsive sampler only measures dissolved concentrations, it provides more useful data than conventional grab samples. By better understanding dissolved PFAS, scientists can more accurately assess chemical fate, transport, and risk; identify toxicity; and design more effective remediation and monitoring programs.

PFASsive Samplers Provide Off-theShelf, Comprehensive Solutions

  • Durable, field tested, ready-to-use onsite.

  • Unique diverless deployment and retrieval options to reduce costs and speed up field deployments.

  • A reverse tracer for determining equilibrium conditions of each individual sampler.

  • Results on a dissolved-phase basis (e.g., ng/L porewater) – a superior, time-averaged representation of bioavailable concentrations.

PFASsive Samplers Are a Cost-Effective Solution

  • Provides improved understanding of environmental risk and mobility of target compounds because they measure only dissolved analytes, not precipitated or adsorbed species.

  • Saves money by reducing unnecessary investigation, remediation, and management.

  • Reduces risk of contamination and overestimation compared to other traditional sampling techniques.

Experience the SiREM Difference 

PFASsive is an end-to-end service; SiREM provides the samplers and optional support for diverless deployment, conducts analytical chemistry (in partnership with Eurofins Environmental Testing Northern California), and reports the final data regarding the equilibrium concentration of PFAS.

These samplers are easy to use and can be easily adapted to address to the growing list of PFAS chemicals as regulations and analytical techniques evolve.

Ready to order?

Contact SiREM for more information on our PFASsive passive sampling services.