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The (partial) replacement of synthetic polymers with bioplastics is due to increased production of conventional packaging plastics causing for severe environmental pollution with plastics waste. The bioplastics, however, represent complex mixtures of known and unknown (bio)polymers, fillers, plasticizers, stabilizers, flame retardant, pigments, antioxidants, hydrophobic polymers such as poly(lactic acid), polyethylene, polyesters, glycol, or poly(butylene succinate), and little is known of their chemical safety for both the environment and the human health. Polymerization reactions of bioplastics can produce no intentionally added chemicals to the bulk material, which could be toxic, as well. When polymers are used to food packing, then the latter chemicals could also migrate from the polymer to food. This fact compromises the safety for consumers, as well. The scarce data on chemical safety of bioplastics makes a gap in knowledge of their toxicity to humans and environment. Thus, development of exact analytical protocols for determining chemicals of bioplastics in environmental and food samples as well as packing polymers can only provide warrant for reliable conclusive evidence of their safety for both the human health and the environment. The task is compulsory according to legislation Directives valid to environmental protection, food control, and assessment of the risk to human health. The quantitative and structural determination of analytes is primary research task of analysis of polymers. The methods of mass spectrometry are fruitfully used for these purposes. Methodological development of exact analytical mass spectrometric tools for reliable structural analysis of bioplastics only guarantees their safety, efficacy, and quality to both humans and environment. This study, first, highlights innovative stochastic dynamics equations processing exactly mass spectrometric measurands and, thus, producing exact analyte quantification and 3D molecular and electronic structural analyses. There are determined synthetic polymers such as poly(ethylenglycol), poly(propylene glycol), and polyisoprene as well as biopolymers in bags for foodstuffs made from renewable cellulose and starch, and containing, in total within the 20,416–17,495 chemicals per sample of the composite biopolymers. Advantages of complementary employment in mass spectrometric methods and Fourier transform infrared spectroscopy is highlighted. The study utilizes ultra-high resolution electrospray ionization mass spectrometric and Fourier transform infrared spectroscopic data on biodegradable plastics bags for foodstuffs; high accuracy quantum chemical static methods, molecular dynamics; and chemometrics. There is achieved method performance |r| = 0.99981 determining poly(propylene glycol) in bag for foodstuff containing 20,416 species and using stochastic dynamics mass spectrometric formulas. The results highlight their great capability and applicability to the analytical science as well as relevance to both the fundamental research and to the industry.
Spatial hotspots of microplastic accumulation in sediment associated with stream outflows into lakes and estuaries
Vol 6, Issue 2, 2025
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Abstract
Microplastics are a major form of anthropogenic pollution, and over time, the sediment at the bottom of aquatic environments becomes the sink for the denser of these particles. By mapping and analyzing sediment from lake and estuary systems, this study aimed to find spatial relationships between water and sediment dynamics at stream-to-slack-water transitions and resulting microplastic sediment accumulation characteristics. Sediment was collected along transects extending from the stream mouth to open water depositional environments at four unique study sites. After a series of separations from collected sediment, microplastics were weighed to map longitudinal variations in plastic concentration. At all study sites, the highest concentrations of microplastics (up to 14% dry weight) in sediment were found to focus in spatial hotspots peaking 600–700 m down gradient from the transition to a low-energy environment in intertidal freshwater estuary systems, and 150 m downstream in a lake system, all being associated with environments of clay-dominated sediment deposition. The dominant types of plastics identified were cellophane and polydimethylsiloxane. We hypothesize these spatial hotspots of microplastic accumulation may result from the unique diversity of density ranges for microplastic sediment, ranging from just above 1 g/cm3, but below the 2.7 g/cm3 common for natural mineral sediment, thus creating plastic depositional locations that are spatially offset from those of common mineral grains.
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Beijing University of Technology, China
