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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.
Analysis of air quality pollution in Chengdu utilizing logistic regression for multi-class classification based on the distance metric between classes
Vol 2, Issue 1, 2021
Issue release: 31 December 2021
VIEWS - 3584 (Abstract)
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Abstract
The health of individuals is intimately linked to air quality, making it crucial to investigate the pollutants that influence it. A sequential Logistic multi-classification approach, which utilizes the distance between classes, was applied to analyze the air quality data of Chengdu spanning from May 2019 to April 2020. By leveraging the inter-class distance metric, the multi-class classification challenge was converted into a series of binary classification tasks. Using a sequential strategy, binary Logistic regression was then employed for each task. The accuracy rate post-stepwise regression was utilized to assess the impact of various pollutants on air quality. The findings indicate that PM2.5, PM10, NO2, and O3 are the four primary pollutants with the most significant collective influence on Chengdu's air quality. Consequently, the government should enhance the joint monitoring of these pollutants and develop targeted policies to mitigate their levels.
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Prof. Hongxing Dai
Beijing University of Technology, China
