Connecting Waterpeople

Toxic 'forever chemicals' accumulate above the water table

  • Toxic 'forever chemicals' accumulate above the water table
    Graphical abstract. Credit: Reviews of Geophysics (2022). DOI: 10.1029/2021RG000765

About the entity

American Geophysical Union
AGU galvanizes a community of Earth and space scientists that collaboratively advances and communicates science and its power to ensure a sustainable future.
ACCIONA

PFAS (per- and polyfluoroalkyl substances) are water-, stain-, and heat-resistant chemicals added to products like nonstick pans, nail polish, food wrappers, and firefighting foam. They have been linked to health problems, including thyroid disease, liver damage, and kidney cancer. Increasingly, PFAS have become a public health concern because they don't break down, instead accumulating in the environment. These so-called "forever chemicals" are now found virtually everywhere, from human blood to the top of Mount Everest. Researchers are urgently trying to understand how PFAS move through the environment to get a better grasp of the extent of the problem and how to control it.

In a new article published in Reviews of Geophysics, Xueyan Lyu and colleagues summarize research published between 2010 and 2022 regarding the fate and transport of PFAS in the soil, ground, and groundwater. The article reviews the physical and chemical properties of PFAS that affect how they move through the subsurface environment and what causes them to stick around. The authors pay particularly close attention to transitional spaces, like soil to groundwater and air to groundwater.

Strikingly, the authors found that just a handful of PFAS have been studied in any detail, even though more than 3,000 have been manufactured and the list continues to grow rapidly. They identified the portion of soil above the water table as a hot spot of PFAS accumulation. Of the PFAS studied, the ones with short carbon chains and negative charges were most likely to move through soil and contaminate the groundwater.

The authors emphasize, however, that most observational and modeling studies on the fate and transport of PFAS have been conducted at a fairly small scale in a laboratory setting. The authors call for large-scale studies in natural settings that will provide critical information necessary to assess the environmental and health impacts associated with the exposure to PFAS, along with future remediation endeavors.

Subscribe to our newsletter

The data provided will be treated by iAgua Conocimiento, SL for the purpose of sending emails with updated information and occasionally on products and / or services of interest. For this we need you to check the following box to grant your consent. Remember that at any time you can exercise your rights of access, rectification and elimination of this data. You can consult all the additional and detailed information about Data Protection.

Featured news