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We are pleased to announce that an article on the pH-dependent adsorption of phenoxyalkanoic herbicides in soils has been published in the journal Environmental Science and Pollution Research. Dr. Eng. Miłosz Huber from the Department of Geology, Soil Science, and Geoinformation at UMCS is one of the co-authors of this publication.
Paszko T., Spadotto C.A., Huber M. et al. 2024, Can the pH-dependent adsorption of phenoxyalkanoic herbicides in soils be described with a single equation? Environ Sci Pollut Res. https://doi.org/10.1007/s11356-024-35413-0
The study described in the article focused on modeling the pH-dependent adsorption of phenoxyalkanoic herbicides in various types of soils. It was found that neutral herbicide forms are primarily adsorbed by fulvic acids present in the soil, binding these compounds to mesopore surfaces larger than 2.5 nm. In contrast, anionic forms of herbicides interact with pH-dependent sorption sites associated with aluminum and iron oxyhydroxides as well as humins. Two models were developed to describe the adsorption processes of these compounds in soil. The simpler model considered only humic substance fractions and variables related to potential soil acidity. The more complex model, which also accounted for Al and Fe oxyhydroxide content, utilized a modified Henderson–Hasselbalch equation to estimate the activity ranges of pH-dependent sorption sites. The results indicate that fulvic and humic acids are the key adsorbents of phenoxyalkanoic herbicides, suggesting that the transport of these herbicides with dissolved organic matter is an important mechanism contributing to the contamination of groundwater and surface water.
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