Passive Sampler with Polymeric Organosilica Sorbent for PFAS
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Solution Overview
Problem
Current passive samplers are inadequate for reliably measuring perfluoroalkyl substances (PFASs) due to their ubiquitous presence, leading to high cross-contamination risks and variability in data precision, especially since existing designs like LDPE bags and reticulated polyurethane foam are not ideal sorbents for PFASs compounds.
Innovation Solution
A passive sampler using a unique polymeric organosilica sorbent, such as Osorb®, is designed with a granular adsorbent material housed in HDPE, allowing direct flow and rapid equilibration, and is compatible with PFAS analysis, reducing cross-contamination and improving measurement accuracy and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional passive samplers (LDPE bags or reticulated polyurethane foam) are used, then the sampler structure is simple and easy to manufacture, but the measurement precision and reliability of PFASs data are poor due to high cross-contamination risk and nonlinear sorption
Solution Approach 1:
The patent employs a porous polymeric organosilica sorbent material with controlled pore structure and high surface area. The porous architecture provides numerous adsorption sites for PFASs compounds while maintaining linear sorption behavior. The material's pore size distribution and surface chemistry are optimized to enhance selective adsorption of PFASs, resolving the contradiction between measurement precision and device complexity by using a specialized sorbent rather than conventional simple structures.
Solution Approach 2:
The patent uses a composite sorbent material combining polymeric and organosilica components. This composite structure integrates the advantages of both material types: the polymeric component provides flexibility and porosity, while the organosilica component offers high surface area and selective adsorption sites. The composite material achieves superior measurement precision for PFASs while maintaining reasonable device complexity through optimized material composition and structure.
2Reliability
If polymeric organosilica sorbent is used, then the measurement precision and reliability improve with linear and predictable concentration factors, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent optimizes key parameters of the polymeric organosilica sorbent, including pore size distribution, surface area, and functional group composition. By carefully controlling these parameters during material synthesis, the patent achieves linear and predictable sorption behavior across the expected concentration range. This parameter optimization ensures reliable measurements while allowing for standardized manufacturing processes that balance complexity and cost.
3Measurement precision
If existing sorbents (graphite, LDPE, reticulated polyurethane foam) are used, then the device complexity is low, but the measurement precision is poor due to highly nonlinear sorption across wide concentration ranges
Solution Approach 1:
The patent employs a porous polymeric organosilica sorbent material with controlled pore structure and high surface area. The porous architecture provides numerous adsorption sites for PFASs compounds while maintaining linear sorption behavior. The material's pore size distribution and surface chemistry are optimized to enhance selective adsorption of PFASs, resolving the contradiction between measurement precision and device complexity by using a specialized sorbent rather than conventional simple structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymeric organosilica sorbent-based sampler effectively concentrates PFASs compounds in a linear and predictable manner, enabling reliable measurement and quantitation, with short equilibration times and minimal handling requirements, thus enhancing data quality and reducing costs.
Implementation Method 1
a polymeric adsorbent material suitable for neutral and ionic PFASs
Implementation Method 2
allowing direct flow and rapid equilibration
Implementation Method 3
across a semi-permeable membrane into contact with a sorbent material
Data Source
AI summary
A passive sampling device is provided that is comprised of a member having a first surface and a second surface opposite the first surface and a hole through the member extending from the first surface to the second surface. An adsorbent material is positioned between two mesh members. The adsorbent material allows for efficient and selective removal of organic molecules, such as, for example, perfluoroalkyl substances.