The study, published in Environmental Health, used biological samples and information from the Canadian CARTaGENE population cohort. Participants were drawn from two collection phases, conducted in 2009–2010 and 2013–2014, and were premenopausal women whose sociodemographic characteristics, lifestyle factors and reproductive histories had been recorded. The researchers measured 40 PFAS in serum, the liquid component of blood left after cells and clotting proteins are removed. Serum measurements are widely used in biomonitoring because they provide an estimate of the amount of a chemical present in the body at the time of sampling. Unlike an exposure questionnaire, which may capture potential sources such as food packaging or household products, a serum test reflects the combined result of absorption, distribution, metabolism and elimination.

PFAS are a large family of thousands of manufactured chemicals, not a single substance. Their molecular structures generally contain fluorinated carbon chains attached to functional groups such as carboxylic acids or sulfonates. These structures can repel both water and oil, properties that have made PFAS useful in stain-resistant fabrics, nonstick coatings, firefighting foams, food-contact materials and industrial applications. Some PFAS bind to proteins in blood rather than accumulating primarily in body fat, and several can remain in the human body for years. The best-studied examples include perfluorooctane sulfonic acid, commonly called PFOS, and perfluorooctanoic acid, or PFOA. Regulatory restrictions have reduced the use of some legacy PFAS, but manufacturers have introduced alternative compounds and precursor chemicals that can transform into persistent PFAS in the environment or within biological systems.

Of the 40 substances tested, eight were detected in more than 60 percent of participants. The geometric mean concentration—a measure that is more suitable than a simple arithmetic average for quantities that vary across several orders of magnitude—ranged from 0.03 micrograms per liter for PFHpS and MeFOSAA to 4.25 micrograms per liter for PFOS. The combined concentration of seven PFAS, designated Σ7PFAS, had a geometric mean of 8.00 micrograms per liter. A geometric mean is calculated by averaging logarithmic values and then converting the result back to the original scale, reducing the influence of unusually high measurements. It should not be interpreted as a threshold for safety or harm; the study was descriptive and was not designed to establish health effects or identify a disease risk associated with any individual concentration.

The investigators also found evidence that alternative and precursor PFAS are present in human serum, although generally at lower concentrations than the most prominent legacy chemicals. The compounds detected included sulfonamidoacetic acids, sulfonamides, fluorotelomers and fluoroethers. For these newer or less routinely measured substances, the 95th-percentile concentrations were below 0.5 micrograms per liter. The 95th percentile represents the level below which 95 percent of measurements fall, making it useful for describing the upper part of a population distribution without focusing exclusively on extreme outliers. The findings do not show that these substances are harmless, nor do they reveal precisely how participants encountered them. Rather, they demonstrate why biomonitoring programs that measure only a small set of familiar PFAS may overlook part of the population’s chemical exposure profile.

The strongest patterns emerged when the researchers compared concentrations with reproductive history. For several legacy PFAS—including PFOS, PFNA, PFOA and PFHxS—concentrations declined monotonically with each additional child a participant had given birth to. The same pattern was observed for Σ7PFAS. In this context, a monotonic decline means that the measured concentration generally decreased as the number of births increased, rather than fluctuating randomly between categories. Concentrations were also higher among participants who had gone longer since their most recent pregnancy, while those who reported a history of breastfeeding tended to have lower levels. The results are consistent with pregnancy and lactation acting as routes through which PFAS can leave the maternal circulation. During pregnancy, chemicals can be transferred across the placenta to the developing fetus, while breastfeeding can transfer chemicals into milk. These processes may reduce maternal serum concentrations, even though they represent exposure pathways for the fetus or infant.

Age would normally be expected to increase the body burden of persistent substances because longer-lived chemicals have had more time to accumulate. Yet in this analysis, the concentration-lowering association of parity—the number of births—appeared to outweigh the age-related bioaccumulative effect for most legacy PFAS. This does not mean that age is unimportant or that pregnancy eliminates PFAS from the body. PFAS elimination depends on the specific compound, kidney and liver processes, protein binding, exposure patterns and individual physiology. A person may also continue to encounter PFAS through drinking water, food, dust, consumer products or occupational settings after pregnancy. The finding instead illustrates how biological events can alter the concentration measured in blood and why reproductive history is essential when scientists compare PFAS levels between individuals or populations.

Socioeconomic patterns were also visible. Participants who reported a household income below the Canadian low-income cut-off had lower concentrations of PFOS, PFNA, PFOA, PFHxS, PFDA, PFUnA and the combined Σ7PFAS measure. The authors note that this result is consistent with previous investigations reporting lower exposure to some PFAS among financially disadvantaged populations, although the study does not establish the reason for the association. Income can correlate with numerous exposure-related factors, including occupation, housing conditions, diet, consumer-product use, access to treated or contaminated water, and geographic location. A lower serum concentration therefore cannot be interpreted as evidence that people with fewer financial resources face lower environmental risks overall. Different pollutants can follow entirely different socioeconomic patterns, and the measured PFAS may not represent every relevant chemical exposure.

The researchers emphasize that their work expands the scope of human biomonitoring rather than providing a final assessment of health risk. The study was a descriptive analysis of premenopausal participants in one Canadian cohort, and its measurements came from defined sampling periods more than a decade ago. Because the analysis was not designed as a longitudinal experiment, it cannot prove that pregnancy, breastfeeding or income caused a particular change in PFAS concentration. It also cannot identify which products, foods, workplaces or environmental sources contributed to exposure, and it does not determine whether the detected alternatives have the same persistence or toxicity as legacy compounds. Even so, the widespread detection of several newer PFAS at low levels is an important signal for environmental surveillance. As older substances are restricted and replaced, scientists will need analytical methods capable of tracking a shifting chemical landscape, while studies of pregnancy and early-life exposure will remain central to understanding how these durable pollutants move through the human body and across generations.

PFAS are notoriously difficult to remove from water because of their chemical stability and presence at extremely low concentrations, often in parts per trillion. This low concentration makes detection and extraction immensely challenging, akin to retrieving a single drop of dye from an Olympic-sized swimming pool. Despite these challenges, exposure to PFAS has been linked to severe health effects, including birth defects, cancer, and impaired immune response. Current filtration technologies, while effective to some extent, often incorporate fluorinated materials that risk reintroducing fluorinated contaminants into the environment upon degradation. The UF research team aimed to design a filtration medium that avoids these pitfalls by engineering a nonfluorinated polymer adsorbent, bringing a sustainable edge to the fight against water contamination.

The key innovation lies in the creation of a gel-like polymer that exploits electrostatic interactions to trap PFAS molecules, particularly perfluorooctanoic acid (PFOA), one of the most abundant PFAS variants in polluted water. Unlike traditional adsorbents where binding sites are limited to material surfaces, the porous architecture of this gel allows PFOA molecules to be captured throughout the entire volume of the material. This three-dimensional immobilization significantly enhances the filtration capacity and efficiency, enabling the material to trap a higher amount of contaminants per unit mass. This breakthrough approach mimics functions similar to “molecular Velcro,” where the material’s charged sites snare PFAS compounds with high affinity and selectivity.

What sets this new material apart is its chemical modularity. The polymer adsorbent is constructed such that its chemical composition can be tuned in a stepwise fashion, opening avenues for tailoring the gel to capture a broader spectrum of PFAS molecules beyond PFOA. This modularity extends so that researchers can systematically alter side chain functionalities and polymer backbones to optimize the affinity towards diverse PFAS structures, many of which pose even greater removal challenges due to their unique molecular configurations. This tunability represents a paradigm shift that could yield a palette of custom-designed adsorbents focused on different PFAS contaminants, making water treatment processes more versatile and adaptive.

In terms of practical application, the gel’s reusability is a compelling advantage. After saturating the material with PFAS compounds, a simple solvent flush can regenerate the gel by eluting the captured pollutants, restoring its filtering capabilities for multiple cycles. This recyclability reduces operational costs and waste stream generation compared to disposable adsorbents. Moreover, because the gel does not incorporate fluorine in its composition, it eliminates concerns related to the breakdown and secondary emission of fluorinated compounds during routine maintenance or disposal, aligning well with environmental safety standards.

The UF team’s methodology involved experimental techniques that combined polymer synthesis with rigorous adsorption testing under controlled laboratory conditions. This process confirmed that the gel’s molecular design directly influences adsorption efficiency, revealing critical insights into the physicochemical interactions governing PFAS capture. Such detailed understanding is crucial, as it guides rational design principles for future adsorbents and can inform industrially scalable manufacturing protocols. Their results were recently published in the Journal of Energy and Environmental Materials, emphasizing the peer-reviewed validation of this novel filtration technology.

Beyond scientific novelty, the implications of this research extend into public health policy and environmental management. As regulatory agencies worldwide tighten permissible PFAS limits in drinking water, utilities and water treatment facilities face increasing pressure to implement effective remediation technologies. The availability of a nonfluorinated, reusable, and high-capacity adsorbent could significantly lower the ecological footprint and economic burden associated with PFAS removal, particularly in municipal and industrial-scale applications. The gel’s adaptability may also help address emerging contamination issues by enabling targeted filtration tailored to specific local pollution profiles.

Joshua Moon, Ph.D., the lead investigator and professor of chemical engineering at UF, underscores the importance of this breakthrough in overcoming existing technological roadblocks. He remarks that while PFAS filtration has seen incremental advancements, the leap made by this modular gel presents a fresh conceptual framework. Instead of relying on compounds mimicking PFAS themselves or other fluorinated materials, this approach harnesses strategic electrostatic design and polymer science innovation to achieve specificity and capacity that were previously unattainable with conventional adsorbents.

Looking toward the future, the UF research group is actively refining their material through further testing and collaborative efforts aimed at scaling production. They envision integrating this gel-based adsorbent into water treatment systems, with a particular focus on compatibility with existing infrastructure. Additionally, exploring synergistic combinations with other filtration technologies could accelerate the translation of this basic research into viable commercial solutions, potentially positioning this gel as a cornerstone technology in the global campaign against PFAS pollution.

While the immediate success centers on PFOA, ongoing studies aim to extend this chemical modularity to target longer-chain and more recalcitrant PFAS variants. These compounds have historically evaded removal due to subtle differences in molecular size and charge distribution, which complicate adsorption dynamics. The modular design potentially unlocks the ability to custom-fit adsorption sites to these challenging contaminants, paving the way for comprehensive PFAS remediation treatments that address the full contamination spectrum encountered in environmental waters worldwide.

In summary, the University of Florida’s development of a chemically modular, nonfluorinated polymer gel adsorbent signals a transformative moment in environmental engineering and water purification technology. By leveraging innovative polymer design and avoiding the environmental risks associated with fluorinated materials, this research not only provides a high-performance tool against persistent chemical pollutants but also charts a path for sustainable and adaptable filtration solutions. As the world grapples with safeguarding water resources from increasingly complex and hazardous contaminants, this advancement offers a beacon of hope grounded in cutting-edge science and environmental responsibility.

Article Title: Chemically Modular, Nonfluorinated Polymer Adsorbents for Capturing Per- and Polyfluoroalkyl Substances (PFAS)

News Publication Date: 8-Jun-2026

Web References: DOI: 10.1002/eem2.70435

Keywords

PFAS, Water filtration, Polymer adsorbent, Nonfluorinated materials, Environmental contamination, Chemical engineering, Water purification, PFOA removal, Sustainable filtration, Molecular Velcro, Reusable adsorbent, Water treatment