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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.
Assessment of beach users’ activities and beach quality status, a tool for coastal tourism development in South West Lagos Coastline, Nigeria
Vol 5, Issue 2, 2024
VIEWS - 245 (Abstract)
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Abstract
Tourist activities is one of the management tools used to identify the carrying capacity of beach and level of natural resources impacted by human activities, and it’s highly essential in revenue generation to the national blue economy. However, if its activities is not adequately controlled, it can disrupt the balance of coastal ecosystem and defeat the purpose of environmental services provision. This study assesses the beach quality status and beach users’ activities along the Lagos coastline, Southwest Nigeria. The survey was conducted during the summer holiday period in the peak of dry season (November 2021–February 2022) at six beaches (Atican, Alpha, Elegushi, Narval, Oniru and Takwa). A total number 600 people were interviewed, and secondary information was noted from the beach managers’ files, including the log book kept in the security post and vendor interviews with food and snack merchants and entertainers. Visitors were chosen at random (using a randomised complete design) to participate in interviews via a combination of passive and active questionnaires from a sample size of 100 visitors at each beach. The heterogeneity of tourists’ activities varied and significantly differed across the beaches. T-test values for all the activities were significance (p < 0.05) with the exception of religious and sporting activities. Recreation, clubbing, picnic, family retreat activities scored above 5% in all beaches, given exceptional note to Narval beach that had the highest activities of the tourists in religious group (70%). The Canonical Correspondence Analysis (CCA) ordination bi-plot diagram state that all activities, ages, and number of visitors were identified as the constrained variables. The activities Eigen scores were religious activity (0.79), picnic (0.58), family retreat (0.52), and site viewing (0.38). Religious activity had highest score of 70% with a strong relationship on the tourists of groups of above 50years at the Narval beach. This is in agreement with the cultural activities that accompanied tourism with peculiarity to life style and location. The ascending order of activities at the Oniru beach are: site viewing 9%, family retreat 25% and Picnic 45%. Whereas, the profound activities on recreation from other study area are: 40%, 35%, 30% and 20% at Takwa beach, Elegushi beach, Atican beach and Alpha beach respectively.
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Beijing University of Technology, China
