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Mass Spectrometry Insight for Assessing the Destiny of Plastics in Seawater
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Researchers evaluated isotope ratio mass spectrometry as a tool for identifying the origin of plastic materials in seawater and monitoring their chemical degradation, finding it effective for tracking compositional changes in marine plastic pollution.
Plastic pollution has become an increasingly serious environmental issue that requires using reliable analytical tools to unravel the transformations of primary plastics exposed to the marine environment. Here, we evaluated the performance of the isotope ratio mass spectrometry (IRMS) technique for identifying the origin of polymer material contaminating seawater and monitoring the compositional alterations due to its chemical degradation. Of twenty-six plastic specimens available as consumer products or collected from the Mediterranean Sea, five plastics were shown to originate from biobased polymeric materials. Natural abundance carbon and hydrogen isotope measurements revealed that biopolymers incline to substantial chemical transformation upon a prolonged exposure to seawater and sunlight irradiation. To assess the seawater-mediated aging that leads to the release of micro/nano fragments from plastic products, we propose to use microfiltration. Using this non-destructive separation technique as a front end to IRMS, the fragmentation of plastics (at the level of up to 0.5% of the total mass for plant-derived polymers) was recorded after a 3-month exposure and the rate and extent of disintegration were found to be substantially different for the different classes of polymers. Another potential impact of plastics on the environment is that toxic metals are adsorbed on their surface from the seashore water. We addressed this issue by using inductively coupled mass spectrometry after nitric acid leaching and found that several metals occur in the range of 0.1-90 µg per g on naturally aged plastics and accumulate at even higher levels (up to 10 mg g-1) on pristine plastics laboratory-aged in contaminated seawater. This study measured the degradation degree of different polymer types in seawater, filling in the gaps in our knowledge about plastic pollution and providing a useful methodology and important reference data for future research.
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Researchers used elemental analyzer/isotope ratio mass spectrometry to characterize microplastics, demonstrating that stable isotope analysis can distinguish plastic types and track their environmental sources. The method offers a complementary tool to existing spectroscopic approaches for plastic identification and origin tracing.
Isotope ratio mass spectrometry and spectroscopic techniques for microplastics characterization
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This review assessed isotope ratio mass spectrometry and spectroscopic techniques for microplastic characterization, arguing that the lack of standard analytical methods hampers understanding of MP geographic origins, sources, and environmental distribution — and calling for methodological standardization.
Rapid fingerprinting of source and environmental microplastics using direct analysis in real time-high resolution mass spectrometry
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Researchers developed a rapid fingerprinting method using differential mobility spectrometry to identify the chemical composition and potential sources of environmental microplastics. This non-destructive approach could help identify pollution sources and inform targeted cleanup strategies.
Tracking Dynamic Chemical Reactivity Networks with High-Resolution Mass Spectrometry: A Case of Microplastic-Derived Dissolved Organic Carbon
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Researchers developed a new method using high-resolution mass spectrometry to track how microplastics made of polyurethane break down into thousands of chemical byproducts when exposed to simulated sunlight in seawater. They found that degradation does not simply break plastics into smaller pieces but creates a complex web of chemical reactions producing many different organic compounds. This is important because these dissolved chemical byproducts from microplastic breakdown could have their own toxic effects on marine life and potentially enter the human food chain.
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