We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Detection of microplastics in compost samples using a thermal decomposition method
AI summary Read the abstract
A thermal decomposition method was evaluated for detecting and quantifying microplastics in compost samples, addressing the challenge of finding plastic particles in complex organic matrices. The approach enables identification of microplastic polymer types in compost through their characteristic thermal degradation signatures, supporting monitoring of plastic contamination in agricultural soils.
The ubiquitous presence of unwanted plastics in the environment, especially microscale particles, has been an issue in scientific studies and public debate in the last years. It is well known that oxidative degradation and subsequent fragmentation, caused by UV-radiation, oxidative aging and abrasion lead to the decomposition of larger plastic products into microplastics (MP). Possible effects of these MP on ecosystems are still unclear. Recent studies on MP findings are focused mainly on aquatic systems, while little is known about MP in terrestrial ecosystems. A possible source of MP input into the soil is compost from domestic bio-waste. Inappropriate waste separation causes plastic fragments in the bio-waste, some of which end up in the compost. In Germany compost is used as fertilizer in agriculture, hence MP could enter the soil by this pathway. So far, there have been only a few studies on this object. For this reason, analysis of compost as a sink and source of MP in ecosystems is of high interest. To estimate and monitor the MP content in compost and soil, fast and harmonised analytical methods are essential, which not only measure the polymer type and number of particles, but also the mass content. The most common spectroscopic methods are very time-consuming, often require complex sample preparation steps and cannot determine mass contents. Therefore, we used ThermoExtractionDesorption-GasChromatography-MassSpectrometry (TED-GC-MS) as a fast, integral analytical technique. The sample is pyrolyzed to 600°C in a nitrogen atmosphere and an excerpt of the pyrolysis gases is collected on a solid phase adsorber. Afterwards, the decomposition gases are desorbed and measured in a GC-MS system. Characteristic pyrolysis products can be used to identify the polymer type and determine the mass contents. This method is well established for the analysis of MP in water filtrate samples. In the present work we optimized the TED-GC-MS method for compost and compost/soil matrix and very common polymers, such as polyethylene, polypropylene, polyethylene-terephthalate and polystyrene (sample mass, detection limits, interfering signals, etc.). Additionally, specific pyrolysis products of polymers used for bio-waste bags, such as polylactide (PLA) and polybutylenadipat-terephthalat (PBAT) had to be identified and evaluated. First measurements were carried out on model and real samples from prepared mixtures and composting plant. The samples were sterilized, fractionated, filtered and dried. In addition, half of the sample material was treated with hydrogen peroxide to investigate a possible effect on detection.
More Papers Like This
Pathways of microplastics in soils - Detection of microplastic contents in compost using a thermal decomposition method
AI summary Read the abstract
This study investigated pathways by which microplastics reach agricultural soils, with a focus on detecting microplastic contamination in compost and sewage sludge. Thermal decomposition methods were used to identify polymer types, revealing that compost and sludge are significant vectors for introducing microplastics into soil.
Analysis of microplastics in soil samples by using a thermal decomposition method
AI summary Read the abstract
Researchers tested thermal decomposition as a method for extracting and identifying microplastics in soil samples, a particularly challenging matrix because organic matter interferes with optical detection methods. The approach showed promise for detecting and quantifying plastic content in complex soil environments.
Identification and Quantification of Microplastics in Commercial Compost From a Wide Range of Composting Materials and Potential Environmental Impacts
AI summary Read the abstract
Researchers identified and quantified microplastics in commercial compost derived from household waste, livestock manure, and vegetable straw using acid extraction, filtration, and FTIR spectroscopy. All compost types contained microplastics, with concentrations varying by feedstock type, raising concerns about microplastic introduction to agricultural soils via compost application.
Detection and specific chemical identification of submillimeter plastic fragments in complex matrices such as compost
AI summary Read the abstract
Researchers developed a method for detecting and chemically identifying submillimeter plastic fragments in complex matrices such as compost, targeting particles between 0.01 and 1.0 mm. The study addresses an important gap in microplastic research, since small particles may pose greater environmental risks but have been difficult to analyze in organic fertilizer samples.
Microplastics identification and quantification in the composted Organic Fraction of Municipal Solid Waste
AI summary Read the abstract
Researchers quantified microplastics in composted organic municipal solid waste from five facilities, finding contamination levels that raise concerns about compost quality and the potential transfer of microplastics to agricultural soils through organic waste recycling.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.