Monday, March 23, 2026

 

Initial tests find lead in children’s fast-fashion clothing




American Chemical Society
Initial tests find lead in children’s fast-fashion clothing 

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Fabric from brightly colored shirts, like the yellow (middle) and red (right) samples shown here, tended to release more bioaccessible lead from textiles than muted colors.

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Credit: Cristina Avello and Priscila Espinoza





ATLANTA, March 23, 2026 — Fast fashion is an inexpensive way to dress rapidly growing kids. But preliminary research has found that the fabric in some of these items contains an unwanted, toxic ingredient: lead. After testing several shirts from different retailers, undergraduate researchers found that all samples exceeded U.S. federal regulatory lead limits. They also estimate that even briefly chewing these fabrics (which young kids tend to do) could expose children to dangerous lead levels.

The researchers will present their results at the spring meeting of the American Chemical Society (ACS). ACS Spring 2026 is being held March 22-26; it features nearly 11,000 presentations on a range of science topics.

Kamila Deavers, the principal investigator of the project, began studying lead contamination after her young daughter briefly showed elevated levels of lead in her blood from toy coatings, which happened before today’s strict federal lead limits were in place. The U.S. Consumer Product Safety Commission currently has a 100-parts-per-million (ppm) lead limit for children’s products like toys and clothing. So now, Deavers and undergraduate researchers in her chemistry lab at Marian University focus on identifying heavy-metal-exposure risks in everyday life and sharing the results with the local community.

“I started to see many articles about lead in clothing from fast fashion,” says Deavers. “And I realized not too many parents knew about the issue.”

Previous studies have found high levels of lead in the metal parts in some children’s clothing, such as zippers, buttons and snaps, which has led to product recalls. But lead has also been reported in adult fast-fashion textiles. Deavers says that some manufacturers use lead(II) acetate as an inexpensive way to help dyes stick to the materials and produce bright, long-lasting color.

Cristina Avello and Priscila Espinoza, who are both on pre-medicine tracks at Marian University, joined the project because they wanted to investigate the potential impact of fast fashion on the pediatric population. They saw working in Deavers’ lab as an opportunity to combine meaningful scientific research with community education on an overlooked health issue.

Lead exposure is considered harmful at any level, potentially causing behavior problems, brain and central nervous system damage as well as other negative health effects. Children under 6 years old are considered most at risk from exposure, according to the U.S. Environmental Protection Agency. “Not only are children the most vulnerable to the effects of lead, but they’re also the population that is going to be putting their clothes in their mouths,” says Avello.

The team tested 11 shirts that spanned the rainbow — red, pink, orange, yellow, gray and blue — from four retailers, including fast-fashion and discount companies. “We saw that the shirts we tested were all over the allowed limit for lead of 100 ppm,” says Espinoza. No matter the brand, brightly colored textiles, like red and yellow, tended toward higher amounts of total lead than muted colors. Additionally, Avello recognizes that it’s not feasible to test all children’s clothing items; but from what the team sampled so far, none followed U.S. federal lead regulations.

In a second experiment, the researchers simulated stomach digestion, calculating potential lead exposure and absorption from the tested items. The analysis estimates the maximum lead bioaccessibility within gastric acid, and the researchers used that data to model the potential transfer during mouthing behavior (e.g., sucking, holding or chewing on fabric). The findings suggest that such exposure would exceed the daily lead ingestion limit for children, a safety benchmark set by the U.S. Food and Drug Administration. These bioaccessibilty calculations are likely conservative, says Deavers. Regardless, the data suggest frequent chewing over time could increase a child’s blood lead levels to a point where clinical monitoring is recommended.

Next, Avello and Espinoza will study more shirts and examine their data to see if there is a relationship between the fabric’s lead levels and what children could absorb. They would also like to explore how laundering affects the lead(II) acetate, including whether washing contaminated clothing could spread it to other garments and how different detergents interact with it. For example, it could create a lead-containing scum inside the washing machine that would need to be removed to avoid releasing the contamination into wastewater.

The researchers want these initial results to encourage more thorough screening of clothing items being sold and push the textile industry to find safer replacements to lead(II) acetate during the dyeing process. Alternatives already exist to fix dyes to fabrics and keep them vibrant, including natural mordants from plants with high tannin contents such as oak bark, pomegranate peel and rosemary, and alum, an environmentally safe mordant. “But if you want to change the clothing industry’s technology, that will cost a lot of money,” says Deavers. Without consumer or policy pressure on textile manufacturers to explore safer dyeing methods, there’s little incentive to switch.

Ultimately, the team’s goal is to raise awareness and educate consumers on the potential risks of lead exposure from children’s fast fashion, so people can make informed choices. Avello concludes, “Everything that we’re doing is only important and helpful if we talk about it.”

The research was funded by internal grants from Marian University and Sigma Zeta.

Visit the ACS Spring 2026 program to learn more about this presentation, “Lead contamination in fast fashion children’s clothing,” and other science presentations.

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Title
Lead contamination in fast fashion children’s clothing

Abstract
Fast fashion has raised concerns in recent years due to inconsistent quality controls and potential health risks. Among these risks, lead contamination in clothing is particularly alarming, especially for children. However, regulations on lead levels in clothing are hard to enforce due to the high volume of imported goods. To address this, lead levels were investigated in various colors, brands, and countries of origin. Initial screening was conducted using XRF (X-ray Fluorescence Spectroscopy), followed by quantitative analysis with ICP (Inductively Coupled Plasma). Clothing samples were digested using acid according to EPA 3050b, and bioaccessibility testing was performed using EPA 1340. Additionally, gastric acid was utilized to estimate lead release during ingestion, while saliva was used to imitate oral exposure. Moreover, the ratio of bioaccessible lead was calculated by comparing total and available concentrations and adjusted to child body weight. These findings highlight the implications of lead exposure and the urgent need for improved monitoring and regulatory enforcement.

Sunday, March 22, 2026

 

Controlling the pinewood nematode: finding the best balance between cost and effectiveness




INRAE - National Research Institute for Agriculture, Food and Environment
Maritime pines 

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Maritime pines on the east cost of Ile d'Yeu in France

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Credit: INRAE - Jean-Marie BOSSENNEC





The pinewood nematode (Bursaphelenchus xylophilus) is the most devastating parasite of pine forests across Eurasia. To combat the pinewood nematode, European regulation requires that Member States clear-cut all susceptible tree species within a 500 metre radius of infested trees. However, this measure has not made it possible to eradicate the disease in Portugal, and a previous modelling study1showed it was not effective in vast, pine-only forests. In this new modelling study, scientists compare the cost-effectiveness of clear-cutting within a 500 metre radius of the infestation site versus selective felling, where only infested trees that display symptoms of the disease are cut inside the 20 km x 20 km area around the infestation site in a homogenous stand of maritime pines. To do so, scientists simulated different methods and intensities of ground-based and aerial forest monitoring.

A comprehensive model for assessing different methods of controlling the pinewood nematode

This study is based on a dispersal model of the pinewood nematode’s insect vector, Monochamus galloprovincialis (Robinet C. et al. 2019Robinet C. et al. 2020), and the transmission of the pinewood nematode, with adjustments for the insect’s flight behaviour and the location of pines. The model simulates different monitoring methods and their effectiveness in the Landes forest in southwest France: ground-based visual monitoring from forest roads and paths; ground-based monitoring combined with trapping of the insect vector; and aerial monitoring combined with AI-assisted image analysis. The scientists also incorporated the costs associated with monitoring and analyses to identify the nematode, along with the different types of felling (clear-cutting or selective), and the loss of income linked to the felling of healthy trees. Cost-effectiveness was calculated for several scenarios of nematode introduction (number of dispersing insect vectors), several monitoring methods and intensities, and different proportions of symptomatic trees among infested trees. 

Selective felling offers the best cost-effectiveness, provided monitoring is stepped up 

The results show that aerial monitoring is better than ground surveys. Rapid advances in remote sensing combined with artificial intelligence to detect declining pines should enable even more effective monitoring in the years ahead. For the time being, however, ground surveys remain the only method used. Research is currently under way to make remote sensing more operational (see below).

Whatever the strategy –– selective felling or clear-cutting –– eradication of the pinewood nematode is only possible under optimal conditions for detecting the pinewood nematode: namely, if monitoring is carried out several times by aircraft with high detection efficiency at the times when trees infested by the nematode show symptoms. Under these optimal conditions, selective felling of trees could cost as much as 200 times less than clear-cutting, as it avoids the costs associated with the loss of non-infested trees. 

Under non-optimal conditions, eradication is impossible regardless of the cutting method, in which case the objective is to reduce the impact of the nematode by containing the disease. The selective felling of declining trees still offers the best cost-effectiveness ratio.

These results show that improving monitoring is essential in order to effectively limit the spread of the pinewood nematode. 

Advances and hope in research on remote sensing to monitor forests

Monitoring of the nematode in France currently relies on ground surveys and a network of traps for insect vectors (Mariette et al. 2023). However, research on remote sensing to monitor forests is expanding rapidly. Satellite remote sensing now makes it possible to identify clusters of declining trees fairly well, such as patches of mortality due to spruce bark beetle attacks (the FORDEAD method; Dutrieux et al. 2024). In the case of the pinewood nematode, declining pines are more isolated, scattered across the landscape, and need to be detected individually. For the moment, European satellite images lack the resolution necessary for this. Likewise, drones cannot be used to monitor forest landscapes because the area to be covered is too large. It is therefore necessary to use aircraft or microlights (the method considered in this article), but this detection method is still at the experimental stage. Another important line of research is the processing of these images using AI, which requires a large training dataset and is still under development. Finally, detecting a declining tree does not mean that the cause of its decline is the pinewood nematode. Research is therefore underway to identify the spatio-temporal distribution pattern of symptomatic trees likely damaged by the pinewood nematode. Three of the article’s authors are involved in FORSAID https://forsaid.eu/), a European project aimed at developing a diagnostic tool that combines high-resolution imagery and AI-based analysis.

References

Dutrieux R., Ose K., de Boissieu F., Féret J.-B. (2024). Fordead: a python package for vegetation anomalies detection from Sentinel-2 images. ZenodoDOI: 10.5281/zenodo.12802456.

Mariette N., Hotte H., Chappé A.-M. et al. (2023). Two decades of epidemiological surveillance of the pine wood nematode in France reveal its absence despite suitable conditions for its establishment. Annals of Forest Science, 80 :21. https://doi.org/10.1186/s13595-023-01186-8 

Find out more about Pinewood nematod with our overview in 8 questions and answers

 

Challenging a 300-year-old law of friction




University of Konstanz

Magnetic friction 

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Schematic of two magnetic layers composed of permanent magnets. The magnets in the upper layer are free to rotate, while those in the lower layer are fixed. When the layers move relative to each other, the upper magnets periodically reorient, dissipating energy and giving rise to contactless friction. By decreasing the distance between the layers, which controls the effective load, the friction does not increase monotonically, in contrast to the prediction of Amontons’ law.
Copyright: Hongri Gu

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Credit: Hongri Gu




Researchers at the University of Konstanz have uncovered a new mechanism of sliding friction: resistance to motion that arises without any mechanical contact, driven purely by collective magnetic dynamics. The study shows that friction does not necessarily increase steadily with load, as postulated by Amontons’ law – one of the oldest and most fundamental empirical laws of physics – but can instead exhibit a pronounced maximum when internal magnetic ordering becomes frustrated.

For more than three centuries, Amontons’ law has linked friction directly to load, reflecting the everyday experience that heavier objects are harder to move; for example, pushing a heavy piece of furniture requires far more effort than sliding a light chair. This behaviour is commonly attributed to tiny deformations of the surfaces in contact under load, which increase the number of microscopic contact points and thereby enhance friction. In most classical situations, these deformations remain small and do not qualitatively change the internal structure of the materials during sliding. It is therefore not clear whether Amontons’ law will also hold when sliding induces much stronger internal reconfigurations, as can occur in magnetic materials where motion can modify the magnetic order.

To explore this regime, the team carried out a tabletop experiment using a two-dimensional array of freely rotating magnetic elements moving above a second magnetic layer. Although the two layers never come into physical contact, their magnetic coupling gives rise to a measurable friction force. By varying the separation between the layers, the researchers could continuously tune the effective load while directly observing how the internal magnetic configuration evolves during motion.

“By changing the distance between the magnetic layers, we could drive the system into a regime of competing interactions where the rotors constantly reorganize as they slide,” says Hongri Gu, who carried out the experiments.

Strikingly, friction is weakest at both small and large separations. At intermediate distances, however, competing interactions dominate: the top layer favours an antiparallel alignment of magnetic moments (parallel, but pointing in opposite directions), while the underlying layer favours a parallel arrangement. This incompatibility forces the system into a dynamically unstable configuration. As the layers slide past each other, the magnets are repeatedly driven to switch between these incompatible states in a hysteretic manner (that means the current state depends on its past history), strongly enhancing energy dissipation and producing a pronounced maximum in friction.

“From a theoretical perspective, this system is remarkable because friction does not originate from a physical surface contact, but from the collective dynamics of magnetic moments,” explains Anton Lüders, who developed the theoretical description. The competing magnetic interactions naturally lead to hysteretic reorientations during motion and, as a result, to a friction force that varies non monotonically with load. In this sense, the breakdown of Amontons’ law is not an anomaly but a direct consequence of magnetization dynamics during sliding.

“What is remarkable is that friction here arises entirely from internal reorganization,” adds Clemens Bechinger, who supervised the project. “There is no wear, no surface roughness and no direct contact. Dissipation is generated solely by collective magnetic rearrangements.”

Because the underlying physics is scale free, the results extend far beyond the macroscopic model system. Similar effects may arise in atomically thin magnetic materials, where even small mechanical displacements can switch magnetic order. The findings therefore open new avenues for probing and controlling magnetism through frictional measurements.

In the long term, this work points toward tunable frictional interfaces without wear. By exploiting magnetic hysteresis, friction could be adjusted remotely and reversibly, enabling concepts such as frictional metamaterials, adaptive dampers or contactless control elements. Potential applications range from micro and nanoelectromechanical systems, where wear limits device lifetime, to magnetic bearings, vibration isolation and atomically thin magnets, where mechanical motion is tightly coupled to internal magnetic order. More broadly, magnetic friction offers a new route to accessing collective spin dynamics through purely mechanical measurements, forging a novel link between tribology and magnetism.

 

Facts:

  • Embargoed until 18 March 2026, 06:00 US Eastern Time
    (10:00 London Time, 11:00 CET)

     
  • Original publication: Hongri Gu, Anton Lüders, and Clemens Bechinger, Nonmonotonic Magnetic Friction from Collective Rotor Dynamics (Nature Materials)
    DOI: https://doi.org/10.1038/s41563-026-02538-1
     
  • Press release: University of Konstanz, supported by AI

 

Note to editors:
You can download an image here: https://www.uni-konstanz.de/fileadmin/pi/fileserver/2026/300_jahre_altes_reibungsgesetz.png

Caption: Schematic of two magnetic layers composed of permanent magnets. The magnets in the upper layer are free to rotate, while those in the lower layer are fixed. When the layers move relative to each other, the upper magnets periodically reorient, dissipating energy and giving rise to contactless friction. By decreasing the distance between the layers, which controls the effective load, the friction does not increase monotonically, in contrast to the prediction of Amontons’ law.
Copyright: Hongri Gu

Further images and videos of the experimental setup and magnetic rotor dynamics are available upon request.