Papers

Not so biodegradable: Polylactic acid and cellulose/plastic blend textiles lack fast biodegradation in marine waters

Researchers tested whether textiles made from polylactic acid (PLA), often marketed as biodegradable, actually break down in ocean conditions. They found that PLA fabrics showed no meaningful biodegradation in marine water over the study period, behaving much like conventional plastics. This is important because consumers and manufacturers may falsely believe these materials will not contribute to ocean microplastic pollution.

Reporting Guidelines to Increase the Reproducibility and Comparability of Research on Microplastics

A group of 23 researchers developed standardized reporting guidelines to improve the reproducibility and comparability of microplastic studies across different laboratories and settings. They created a detailed checklist covering best practices for materials, sampling, sample preparation, identification, and quantification of microplastics. The guidelines aim to address a major bottleneck in the field where inconsistent methods have made it difficult to compare findings or conduct reliable large-scale analyses.

Plastic additives in the ocean: Use of a comprehensive dataset for meta-analysis and method development

Researchers compiled the first comprehensive database of studies measuring the more than 13,000 chemical additives — including plasticizers, flame retardants, and antioxidants — that are mixed into plastics and can leach into ocean water, sediment, and marine life. Their meta-analysis revealed major gaps in what's being monitored, with only a small fraction of known additives currently being tested for in marine environments.

Assessing Plastic Brittleness to Understand Secondary Microplastic Formation on Beaches: A Hotspot for Weathered Marine Plastics

Researchers tested the brittleness of plastic debris collected from Hawaiian beaches, finding that highly degraded polyethylene and polypropylene fragments have extremely low molecular weight and show signs of advanced oxidation, making them prone to breaking into even smaller microplastics. The study quantifies how beach plastics become increasingly fragile over time, highlighting beaches as important hotspots where large plastic pollution transforms into harder-to-remove microplastic particles.

Differential scanning calorimetry (DSC): An important tool for polymer identification and characterization of plastic marine debris

Researchers optimized a differential scanning calorimetry method for identifying plastic polymers in marine debris and built a reference library from over 200 polymer standards. They established temperature-based criteria for distinguishing between similar plastic types that are often confused during visual identification. The study provides a practical, reliable tool for improving the accuracy of polymer identification in plastic pollution research.

Previous successes and untapped potential of pyrolysis–GC/MS for the analysis of plastic pollution

This review highlights the potential of pyrolysis combined with gas chromatography and mass spectrometry as a powerful tool for analyzing plastic pollution. Unlike traditional spectroscopy methods, this technique can determine the mass and chemical composition of microplastics, including additives, which is important for understanding health risks. The authors argue this method is underutilized and could significantly advance microplastic research, particularly for very small particles that are difficult to analyze with other approaches.

Microplastic Leachate Negatively Affects Fertilization in the Coral <i>Montipora capitata</i>

Researchers tested whether chemical compounds leaching from microplastics affect coral reproduction by exposing coral gametes to microplastic leachate during fertilization. They found that the leachate significantly reduced fertilization success in the coral species Montipora capitata. The study highlights that the chemical pollution from degrading plastics, not just physical ingestion, poses a direct threat to coral reef reproduction and recovery.

Plastic additives and legacy persistent organic pollutants in the preen gland oil of seabirds sampled across the globe

Researchers analyzed preen gland oil from 145 seabirds across 32 species worldwide for plastic additives and legacy persistent organic pollutants. The study found PCBs and pesticides were ubiquitous and correlated with trophic level, while plastic-associated UV stabilizers were detected in 46% of individuals, suggesting that seabirds are exposed to plastic-derived chemicals alongside traditional pollutants through their diet.

Microplastic Spectral Classification Needs an Open Source Community: Open Specy to the Rescue!

Researchers developed Open Specy, a free, open-source tool for spectral classification of microplastics using Raman and infrared spectroscopy. The platform addresses a critical gap in microplastic research by providing accurate, cost-free identification tools and a community-shared spectral library that better represents the diversity of environmental microplastic pollutants.

Pyrolysis-GC/MS differentiates polyesters and detects additives for improved monitoring of textile labeling accuracy and plastic pollution

Researchers used pyrolysis-gas chromatography/mass spectrometry to analyze 229 consumer polyester products and found that while most were PET, some were mislabeled or contained unexpected polymer blends. They also detected the plasticizer diethyl phthalate in over 23% of products, including children's toys. The findings challenge the common assumption that all polyester products are PET and highlight the importance of accurate textile labeling for both pollution monitoring and consumer safety.

Microplastic characterization and transport mode —A flow-integrated approach to sampling urban waterways

Researchers implemented a flow-integrated monitoring approach to measure microplastic concentrations across varying water flow conditions in urban Southern California waterways. They found that concentrations varied by up to five orders of magnitude between low-flow and storm conditions, with tire wear particles significantly elevated during storms. The study demonstrates that sampling strategies must account for flow variability to accurately estimate microplastic transport in urban rivers.

High concentrations of floating neustonic life in the plastic-rich North Pacific Garbage Patch

Researchers found that floating neustonic life is concentrated in the North Pacific Garbage Patch alongside plastic debris, with a positive relationship between neuston and plastic abundance, suggesting that ocean cleanup efforts must consider impacts on these surface-dwelling organisms.

Computer vision segmentation model—deep learning for categorizing microplastic debris

Researchers developed a deep learning computer vision model for automatically categorizing beached microplastic debris from images. The segmentation model was trained to identify and classify different types of microplastic particles, reducing the need for time-consuming manual counting and laboratory analysis. The study suggests that automated image-based detection could enable more scalable and consistent monitoring of microplastic pollution along coastlines.

Towards Understanding Drivers of Plastic Embrittlement and Fragmentation in Coastal Environments

This review examines the physical and chemical drivers of plastic fragmentation in coastal environments, including UV radiation, mechanical wave action, temperature fluctuations, and oxidation. The authors find that coastal environments produce microplastics faster than open ocean environments due to compounding abiotic stressors, and that fragmentation dynamics shape the size distribution and toxicity profile of coastal plastic pollution.

Prey-size plastics are invading larval fish nurseries

Ocean surface sampling near nursery habitats for larval marine fish found that microplastic particles at the sea surface are now abundant at sizes matching the prey that larvae depend on for survival. This overlap in prey size and plastic particle size suggests that larval fish face a significant risk of accidentally ingesting plastics during their most vulnerable life stage.

Separation of microplastics from deep-sea sediment using an affordable, simple to use, and easily accessible density separation device

This study developed an affordable, simple technique for separating microplastics from deep-sea sediment samples, using density separation and chemical digestion to achieve reliable extraction of plastic particles from these challenging matrices.

Microplastics absent from reef fish in the Marshall Islands: Multistage screening methods reduced false positives

A multi-stage screening study of reef fish gut contents from the Marshall Islands found no microplastics in 97 fish across nine species, suggesting that apparent microplastics in prior studies may largely reflect contamination or misidentification rather than true ingestion.

Microplastic pollution on island beaches, Oahu, Hawai`i

Researchers surveyed microplastic densities on six windward beaches of Oahu, Hawaii, finding very high concentrations of 700-1,700 particles/m2 on high-wave-energy beaches with coarser sands, comparable to other remote island beaches globally.

Scales of Spatial Heterogeneity of Plastic Marine Debris in the Northeast Pacific Ocean

Researchers conducted a systematic assessment of plastic debris spatial heterogeneity across the North Pacific Subtropical Gyre, finding that plastic abundance varied over multiple spatial scales and was not uniformly distributed within the 'Great Pacific Garbage Patch' as popularly portrayed. Debris concentrations were patchy at fine scales and showed no simple relationship with surface current convergence zones.

Hyperspectral reflectance of pristine, ocean weathered and biofouled plastics from a dry to wet and submerged state

Researchers built an open-access hyperspectral library covering pristine, ocean-weathered, and artificially biofouled plastics measured from dry through submerged states, filling a gap in reference data needed for satellite and drone-based plastic pollution monitoring. The library is particularly valuable because biofouling alters a plastic's optical signature and makes remote identification much harder, so having reference spectra for fouled materials improves algorithm accuracy for detecting plastic debris in real-world ocean environments.

Advances in chemical analysis of micro- and nanoplastics

Rise velocity of small polyolefin plastics in a seawater tank exposed to natural conditions in Hawai’i

Researchers measured the rise velocity of positively buoyant polyolefin plastic particles in a seawater tank exposed to natural environmental conditions in Hawaii, examining the effects of surface area to volume ratio and biofouling on buoyancy and transport. They found that biofouling significantly altered the rise velocity of plastics, highlighting the importance of environmental weathering in determining the vertical distribution and sinking behavior of marine plastic debris.

Buried Plastic Pollution and Fragmentation Dynamics in Coastal Zones: Insights from Hawaiian Beaches

Researchers surveyed buried plastic pollution down to 1 meter depth on Hawaiian beaches, which receive disproportionate plastic input due to proximity to the North Pacific Garbage Patch, characterizing the abundance and fragmentation dynamics of subsurface plastic particles to better understand long-term plastic accumulation and degradation in beach environments.

High Concentrations of floating life in the North Pacific Garbage Patch

Researchers tested the hypothesis that floating life (obligate neuston) concentrates in convergent ocean gyres beyond the Sargasso Sea by sampling the eastern North Pacific Subtropical Gyre in the North Pacific Garbage Patch (NPGP). They found significantly higher neuston densities inside the NPGP core than on its periphery and a positive relationship between neuston abundance and floating plastic debris.