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Biosolid amendments as drivers for microplastic pollution in soil: Measurements and insight from multiple analytical methods in an agricultural field study
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Scientists analyzed farm soil that had been treated with sewage sludge (a common fertilizer made from treated wastewater) years earlier, comparing it to untreated soil to identify tiny plastic particles left behind. This research provides detailed tools and data for detecting these microplastics, helping build the scientific groundwork needed to understand how farm fertilizing practices may contribute to plastic pollution in the food we grow.
The ESR05-03 data is split into 4 parts: Part 1—Infrared spectra data: The data set contains chemical characterizations of microplastic particles measured by FTIR. Microplastics were extracted from anaerobic digestate from animal manure obtained from a green energy plant. The data is stored in a CSV file (e.g., D1-2-libsearch-after valid.csv) ESR05-03-part 1-digestate data.zip, while metadata can be found in ESR05-03-part 1-digestate data.doc Part 2—Infrared spectra data: The data set contains chemical characterizations of microplastic particles measured by FTIR. Microplastics were extracted from agricultural soils receiving sludge from 2004 to 2014. The data is stored in a CSV file (e.g., CF1S1-REP1-after validation.csv) ESR05-03-part 2-CF soil data.zip, while meta data can be found in ESR05-03-part 2-CF soil data.doc Part 3—Infrared spectra data: The data set contains chemical characterizations of microplastic particles measured by FTIR. Microplastics were extracted from soil with no history of sewage sludge application and farming practices. The data is stored in a CSV file (e.g., HF1S1-after valid.csv) ESR05-03-part 03-HF soil zip folder, while meta data can be found in ESR05-03-part 03-HF soil data.doc Part 4— Infrared spectra data: The data set contains chemical characterizations of microplastic particles measured by FTIR. Microplastics were extracted from procedural blanks. The data is stored in a CSV file (e.g., CF-blank-after valid.csv) in ESR05-03-part 04-procedural blank data.zip, while meta data can be found in ESR05-03-part 04-procedural blank data.doc Part 5—siMPle spectral library: Polymer identification was carried out using an in-house FTIR spectral reference library in which each reference spectrum is stored as a separate column together with spectrum-specific metadata. The library contains synthetic polymers as well as non-plastic reference materials used to distinguish microplastics from other particles. The ParticleCategory field classifies references as, for example, microplastic (MP), natural material (Natural), coal, mineral, stearate, surfactant, or fish background. The MaterialGroup field provides the corresponding material or polymer class and includes, among others, polyethylene, polypropylene, polyamide, polyester, polystyrene, polyvinyl chloride, polycarbonate, polyoxymethylene, polylactic acid, acrylates/PUR/varnish, cellulose-based materials, plant fibres, animal fibres and rubber materials. The library was further extended with LfU-labelled reference spectra from the Bayerisches Landesamt für Umwelt (LfU, Germany). These include PVC_1_LfU, PVC_2_LfU, PMMA_1_LfU, PMMA_2_LfU, PET_1_LfU, PET_2_LfU, STA_Barsch4_LfU, PE_Fenton_LfU, PP_Fenton_LfU, and PVCr_1_LfU to PVCr_5_LfU. The entries PE_Fenton_LfU and PP_Fenton_LfU provide Fenton-treated polyethylene and polypropylene reference spectra and therefore extend the library with oxidatively aged/weathered polymer spectra. For every reference spectrum, the library additionally stores the particle category, material group, assumed material density, RGB display values, and up to three spectrum-specific probability thresholds linked to defined wavenumber matching intervals (RangeLow and RangeHigh). These metadata are used together with the reference spectra during automated FTIR particle identification.
More Papers Like This
Biosolid amendments as drivers for microplastic pollution in soil: Measurements and insight from multiple analytical methods in an agricultural field study
AI summary Read the abstract
Farms sometimes spread "biosolids" (treated sewage sludge) on fields as fertilizer, and this study measured microplastic particles in soil that had received these applications over a decade compared to untreated farmland. Using detailed chemical testing, researchers confirmed that soil treated with sludge contained identifiable plastic contamination, supporting concerns that this common farming practice can be a source of microplastics building up in agricultural land. Since these plastics can end up in the crops we eat and potentially in our food and water supply, understanding where they come from is an important step toward reducing our overall exposure.
Biosolid amendments as drivers for microplastic pollution in soil: Measurements and insight from multiple analytical methods in an agricultural field study
AI summary Read the abstract
Farms often spread "biosolids" (treated sewage sludge and animal waste) on fields as fertilizer, but this study shows that practice can also introduce microplastic pollution into agricultural soil, with fields that received sludge showing different plastic contamination than untreated fields. Since crops grow in this soil and microplastics can potentially work their way into our food and water, this raises questions about how common farming practices might be a hidden source of plastic exposure in our diets.
Identification of microplastics extracted from field soils amended with municipal biosolids
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Researchers developed a method for extracting and identifying microplastics from agricultural soils that had been treated with municipal biosolids, a common fertilizer derived from wastewater treatment. They found a variety of plastic polymer types in the soil, confirming that biosolid application is a pathway for microplastic contamination of farmland. The study provides a reliable technique for tracking how microplastics cycle through agricultural environments.
Impact of sewage sludge application on soil microplastic accumulation and nutrient levels: Analysis of 22 years of data from central UK farmland
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Researchers analyzed a 22-year dataset from 5,323 fields in central UK to examine the relationship between repeated sewage sludge application and microplastic accumulation in agricultural soils, alongside changes in nutrient levels such as nitrogen and phosphorus. They found that microplastic concentrations increased with cumulative sludge applications while nutrients were taken up by crops, raising concerns about long-term plastic accumulation in farmland receiving sludge-derived fertilizers.
An Overlooked Entry Pathway of Microplastics into Agricultural Soils from Application of Sludge-Based Fertilizers
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Researchers analyzed sludge-based fertilizers applied to agricultural soils and found high microplastic concentrations (hundreds to thousands per kilogram of dry weight) that were transferred to soils after application, identifying this as an important but overlooked pathway for terrestrial microplastic contamination.
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