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https://www.readbyqxmd.com/read/29909455/comparison-of-%C3%AE-atr-ftir-spectroscopy-and-py-gcms-as-identification-tools-for-microplastic-particles-and-fibers-isolated-from-river-sediments
#1
Andrea Käppler, Marten Fischer, Barbara M Scholz-Böttcher, Sonja Oberbeckmann, Matthias Labrenz, Dieter Fischer, Klaus-Jochen Eichhorn, Brigitte Voit
In recent years, many studies on the analysis of microplastics (MP) in environmental samples have been published. These studies are hardly comparable due to different sampling, sample preparation, as well as identification and quantification techniques. Here, MP identification is one of the crucial pitfalls. Visual identification approaches using morphological criteria alone often lead to significant errors, being especially true for MP fibers. Reliable, chemical structure-based identification methods are indispensable...
June 16, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29909309/polycyclic-aromatic-hydrocarbons-affiliated-with-microplastics-in-surface-waters-of-bohai-and-huanghai-seas-china
#2
Lei Mai, Lian-Jun Bao, Lei Shi, Liang-Ying Liu, Eddy Y Zeng
Microplastics (MPs) sized between 0.33 and 5 mm were collected using Manta trawls from ten surface seawater sites in Bohai and Huanghai Seas, China. A total of 1024 (Bohai Sea) and 132 (Huanghai Sea) microplastic pieces were classified, including polystyrene foams, polyethylene films and lines, and other plastic pellets, with concentrations of MPs ranging from 3 to 162 particles per 100 m3 (0.012-2.96 mg m-3 ). A pretreatment of MPs with 30% H2 O2 in water did not significantly lower polycyclic aromatic hydrocarbon (PAH) concentrations on MPs compared to no H2 O2 pretreatment...
June 7, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29909221/identification-of-microplastics-using-raman-spectroscopy-latest-developments-and-future-prospects
#3
REVIEW
Catarina F Araujo, Mariela M Nolasco, Antonio M P Ribeiro, Paulo J A Ribeiro-Claro
Widespread microplastic pollution is raising growing concerns as to its detrimental effects upon living organisms. A realistic risk assessment must stand on representative data on the abundance, size distribution and chemical composition of microplastics. Raman microscopy is an indispensable tool for the analysis of very small microplastics (<20 μm). Still, its use is far from widespread, in part due to drawbacks such as long measurement time and proneness to spectral distortion induced by fluorescence...
June 6, 2018: Water Research
https://www.readbyqxmd.com/read/29908513/evidence-that-microplastics-aggravate-the-toxicity-of-organophosphorus-flame-retardants-in-mice-mus-musculus
#4
Yongfeng Deng, Yan Zhang, Ruxia Qiao, Melvin M Bonilla, Xiaoliang Yang, Hongqiang Ren, Bernardo Lemos
This study was performed to reveal the health risks of co-exposure to organophosphorus flame retardants (OPFRs) and microplastics (MPs). We exposed mice to polyethylene (PE) and polystyrene (PS) MPs and OPFRs [tris (2-chloroethy) phosphate (TCEP) and tris (1,3-dichloro-2-propyl) phosphate (TDCPP)] for 90 days. Biochemical markers and metabolomics were used to determine whether MPs could enhance the toxicity of OPFRs. Superoxide dismutase (SOD) and catalase (CAT) increased (p < 0.05) by 21% and 26% respectively in 10 μg/L TDCPP + PE group compared to TDCPP group...
June 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29900204/data-on-sorption-of-organic-compounds-by-aged-polystyrene-microplastic-particles
#5
Thorsten Hüffer, Anne-Katrin Weniger, Thilo Hofmann
This article contains data on experimental sorption isotherms of 21 probe sorbates by aged polystyrene microplastics. The polymeric particles were subjected to an UV-induced photo-oxidation procedure using hydrogen peroxide in a custom-made aging chamber. Sorption data were obtained for aged particles. The experimental sorption data was modelled using both single- and poly-parameter linear free-energy relationships. For discussion and interpretation of the presented data, refer to the research article entitled "Sorption of organic compounds by aged polystyrene microplastic particles" (Hüffer et al...
June 2018: Data in Brief
https://www.readbyqxmd.com/read/29898538/weathering-impacts-the-uptake-of-polyethylene-microparticles-from-toothpaste-in-mediterranean-mussels-m-galloprovincialis
#6
Inger Lise N Bråte, Mercedes Blázquez, Steven J Brooks, Kevin V Thomas
Mediterranean mussels (Mytilus galloprovincialis) were exposed over 21 days to polyethylene (PE) particles (0.01 mg ml-1 ; 50-570 μm) isolated from toothpaste. PE was deployed in the Outer Oslofjord (Norway) for 21 days, before exposing the mussels to both virgin (PE-V) and weathered PE (PE-W) particles. The mussels ingested both types of particles, but significantly more weathered particles were ingested than virgin (p = .0317), based on PE dosed by weight (mg ml-1 ) but not when considering particle number (PE-V: 1...
June 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29894871/the-distribution-of-microplastics-in-soil-aggregate-fractions-in-southwestern-china
#7
G S Zhang, Y F Liu
Plastic particle accumulation in arable soils is a growing contaminant of concern with unknown consequences for soil productivity and quality. This study aimed to investigate abundance and distribution of plastic particles among soil aggregate fractions in four cropped areas and an established riparian forest buffer zone at Dian Lake, southwestern China. Plastic particles (10-0.05 mm) from fifty soil samples were extracted and then sorted by size, counted, and categorized. Plastic particles were found in all soil samples...
June 9, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29890582/uptake-and-effects-of-the-antimicrobial-florfenicol-microplastics-and-their-mixtures-on-freshwater-exotic-invasive-bivalve-corbicula-fluminea
#8
Lúcia Guilhermino, Luís R Vieira, Diogo Ribeiro, Ana Sofia Tavares, Vera Cardoso, Anabela Alves, José Manuel Almeida
Microplastics and antimicrobials are widely spread environmental contaminants and more research on their toxicity is needed. The uptake and effects of the antimicrobial florfenicol, microplastics, and their mixtures on Corbicula fluminea were investigated. Bivalves were exposed for 96h to florfenicol (1.8 and 7.1mg/l), microplastics (0.2 and 0.7mg/l), or mixtures of the two substances. After 96h, all bivalves exposed to antimicrobial treatments had florfenicol in their body (e.g. 2±1μg/g). Microplastics were found in the gut, lumen of the digestive gland, connective tissue, hemolymphatic sinuses, and gills surface of animals...
May 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29890490/screening-study-of-four-environmentally-relevant-microplastic-pollutants-uptake-and-effects-on-daphnia-magna-and-artemia-franciscana
#9
Anita Jemec Kokalj, Urban Kunej, Tina Skalar
This study investigated four different environmentally relevant microplastic (MP) pollutants which were derived from two facial cleansers, a plastic bag and polyethylene textile fleece. The mean size range of the particles (according to number distribution) was 20-250 μm when measured as a powder and 0.02-200 μm in suspension. In all MP exposures, plastic particles were found inside the guts of D. magna and A. franciscana, but only in the case of daphnids a clear exponential correlation between MP uptake in the gut and the size of the MP was identified...
June 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29886990/microplastics-on-sandy-beaches-of-the-baja-california-peninsula-mexico
#10
Teresita de Jesus Piñon-Colin, Ruben Rodriguez-Jimenez, Miguel Angel Pastrana-Corral, Eduardo Rogel-Hernandez, Fernando Toyohiko Wakida
No abstract text is available yet for this article.
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886965/microplastic-in-the-gastrointestinal-tract-of-fishes-along-the-saudi-arabian-red-sea-coast
#11
Fadiyah M Baalkhuyur, El-Jawaher A Bin Dohaish, Manal E A Elhalwagy, Nabeel M Alikunhi, Abdulaziz M AlSuwailem, Anders Røstad, Darren J Coker, Michael L Berumen, Carlos M Duarte
This study assesses the presence of microplastic litter in the contents of the gastrointestinal tract of 26 commercial and non-commercial fish species from four difference habitats sampled along the Saudi Arabian coast of the Red Sea. A total of 178 individual were examined for microplastics. In total, 26 microplastic fragments were found. Of these, 16 being films (61.5%) and 10 being fishing thread (38.5%). FTIR analysis revealed that the most abundant polymers were polypropylene and polyethylene. The grouper (Epinephelus spp...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886959/formation-of-microplastics-by-polychaetes-marphysa-sanguinea-inhabiting-expanded-polystyrene-marine-debris
#12
Mi Jang, Won Joon Shim, Gi Myung Han, Young Kyoung Song, Sang Hee Hong
Fragmentation of large plastic debris into smaller particles results in increasing microplastic concentrations in the marine environment. In plastic debris fragmentation processes, the influence of biological factors remains largely unknown. This study investigated the fragmentation of expanded polystyrene (EPS) debris by polychaetes (Marphysa sanguinea) living on the debris. A large number of EPS particles (131 ± 131 particles/individual, 0.2-3.8 mm in length) were found in the digestive tracts of burrowing polychaetes living on EPS debris...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886953/microplastic-at-nesting-grounds-used-by-the-northern-gulf-of-mexico-loggerhead-recovery-unit
#13
Valencia K Beckwith, Mariana M P B Fuentes
Microplastics can impact key habitats used by endangered species, such as marine turtles. They impact the environment by transporting toxicants and altering sediment properties affecting temperature and sediment permeability. Our study determined the exposure of the ten most important nesting sites for the Northern Gulf of Mexico Loggerhead Recovery Unit to microplastic. Sand samples were obtained at each nesting site during the 2017 nesting season and analyzed for abundance and characteristics of microplastic...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886950/microplastics-on-the-portuguese-coast
#14
J Antunes, J Frias, P Sobral
Marine anthropogenic litter was analysed in eleven beaches along the Portuguese coast, over a two-year period (2011-2013). Of all collected items, 99% were plastic and 68% were microplastics (MP; 1-5 mm in diameter). Higher MP concentrations were found in winter/autumn, near industrial areas and/or port facilities and in beaches exposed to dominant winds. Resin pellets (79%) were the dominant category close to industrial areas and high concentrations of fragments and polymeric foams were found near fishing ports...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886944/microplastic-contents-from-maricultured-and-natural-mussels
#15
Monia Renzi, Cristiana Guerranti, Andrea Blašković
Results of this research focuses on microplastic contents (levels, type, size, colour) in maricultured and natural mussels (Mytilus galloprovincialis) from different Italian stocks. No significant differences were found among maricultured and natural stocks. All recovered MPs are filaments ranging within 750-6000 μm of maximum length (average values 1150-2290 μm). Feeding raw mussel could produce median MP intakes of 6.2-7.2 items/g w.w. Concerning human exposure by diet, both raw and cooked values are important...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886936/the-sorption-kinetics-and-isotherms-of-sulfamethoxazole-with-polyethylene-microplastics
#16
Baile Xu, Fei Liu, Philip C Brookes, Jianming Xu
Microplastics and sulfamethoxazole coexist ubiquitously in the marine environment, and microplastics tend to sorb organic pollutants from the surrounding environment. Here, the sorption kinetics and isotherms of sulfamethoxazole on polyethylene (PE) microplastics closely fitted a pseudo-second-order model (R2  = 0.98) and linear model (R2  = 0.99), respectively, indicating that the sorption process was partition-dominant interaction. The main binding mechanism was possibly the van der Waals interaction for hydrophilic sulfamethoxazole onto hydrophobic PE microplastics...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886731/validation-of-a-method-for-extracting-microplastics-from-complex-organic-rich-environmental-matrices
#17
Rachel R Hurley, Amy L Lusher, Marianne Olsen, Luca Nizzetto
Complex and organic-rich solid substrates such as sludge and soil have been shown to be contaminated by microplastics; however, methods for extracting plastic particles have not yet been systemically tested or standardised. This study investigated four main protocols for the removal of organic material during analysis of microplastics from complex solid matrices: oxidation using H2O2, Fenton's reagent, and alkaline digestion with NaOH and KOH. Eight common polymer types were used to assess the influence of reagent exposure on particle integrity...
June 9, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29881968/wastewater-treatment-plants-as-a-source-of-microplastics-in-river-catchments
#18
Paul Kay, Robert Hiscoe, Isobel Moberley, Luke Bajic, Niamh McKenna
It is now well established that the oceans contain significant accumulations of plastic debris but only very recently have studies began to look at sources of microplastics (MPs) in river catchments. This work measured MPs up- and downstream of six wastewater treatment plants (WWTPs) in different catchments with varying characteristics and found that all led to an increase in MPs in rivers. Nevertheless, the data collected indicated that there were other important sources of MPs in the catchments studied and that these may include atmospheric deposition, agricultural land to which sewage sludge has been applied, and diffuse release of secondary MPs following the breakdown of larger plastic items...
June 7, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29872923/distribution-of-microplastics-and-nanoplastics-in-aquatic-ecosystems-and-their-impacts-on-aquatic-organisms-with-emphasis-on-microalgae
#19
Jun-Kit Wan, Wan-Loy Chu, Yih-Yih Kok, Choy-Sin Lee
Plastics, with their many useful physical and chemical properties, are widely used in various industries and activities of daily living. Yet, the insidious effects of plastics, particularly long-term effects on aquatic organisms, are not properly understood. Plastics have been shown to degrade to micro- and nanosize particles known as microplastics and nanoplastics, respectively. These minute particles have been shown to cause various adverse effects on aquatic organisms, ranging from growth inhibition, developmental delay and altered feeding behaviour in aquatic animals to decrease of photosynthetic efficiency and induction of oxidative stress in microalgae...
June 6, 2018: Reviews of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29870939/microplastic-pollution-in-sediments-from-the-bohai-sea-and-the-yellow-sea-china
#20
Jianmin Zhao, Wen Ran, Jia Teng, Yongliang Liu, Hui Liu, Xiaonan Yin, Ruiwen Cao, Qing Wang
Microplastics are one of the most significant pollutants in the marine environment and accumulate in sediments all over the world. To assess the pollution level in the marine environment in China, the distribution and abundance of microplastics in sediments from the Bohai Sea and the Yellow Sea were investigated in this study. The sediment samples were collected from 72 different sites in the Bohai Sea and the Yellow Sea. Microplastics were separated from sediment through density flotation and categorized according to shape and size under a microscope...
June 2, 2018: Science of the Total Environment
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