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The potential of TNT to accumulate in aquatic organisms was assessed by determining bioconcentration factors for TNT and TNT biotransformation products using two benthic invertebrates (Chironomus tentans and Lumbriculus variegatus), and by determining the bioaccumulation factor of TNT and TNT biotransformation products due to TNT exposure via feeding for channel catfish (Ictalurus punctatus). In all three species, TNT was rapidly biotransformed resulting in minimal accumulation. The bioconcentration factors for parent TNT ranged from 3 to 4 ml g(-1) for the invertebrates studied, while the TNT bioaccumulation factor for catfish via oral exposure of food pellets was 2.4x10(-5) g g(-1) based on the concentration of TNT in the food pellet. As indicated by this small bioaccumulation factor, TNT accumulation in channel catfish through trophic transfer would be negligible compared to aqueous exposure (previously reported BCF of 0.79 ml g(-1)). TNT extractable biotransformation products accumulated to a greater degree than parent TNT for all three species. In addition, a large fraction of the radioactivity within all three species resisted solvent extraction. The highest bioconcentration factors occurred in L. variegatus with extractable radioactivity measuring 76 ml g(-1) and total radioactivity measuring 216 ml g(-1). Because the bioaccumulation of TNT is very low compared to the bioaccumulation of its biotransformation products, further research including identifying and determining the relative toxicities of these biotransformation products is necessary to fully evaluate the environmental risk posed by exposure to TNT. 相似文献
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Romário J. da Silv Lizeth Carolina Mojica-Sánchez Filipe D.S. Gorz Graciela C. Pedro Bruna G. Maciel Gabriela P. Ratkovski Hérica D. da Roch Kamila T.O. do Nascimento Juan C. Medina-Llamas Alicia E. Chávez-Guajardo José J. Alcaraz-Espinoz Celso P. de Melo 《环境科学学报(英文版)》2021,33(2):62-73
We report the preparation of poly(3,4-ethylene dioxythiophene) (PEDOT)-modified polyvinylidene fluoride electrospun fibers and their use as a novel adsorbent material for the removal of the anionic dye Methyl Orange (MO) from aqueous media. This novel adsorbent material can be used to selectively remove MO on a wide pH range (3.0–10.0), with a maximum capacity of 143.8 mg/g at pH 3.0. When used in a recirculating filtration system, the maximum absorption capacity was reached in a shorter time (20 min) than that observed for batch mode experiments (360 min). Based on the analyses of the kinetics and adsorption isotherm data, one can conclude that the predominant mechanism of interaction between the membrane and the dissolved dye molecules is electrostatic. Besides, considering the estimated values for the Gibbs energy, and entropy and enthalpy changes, it was established that the adsorption process is spontaneous and occurs in an endothermic manner. The good mechanical and environmental stability of these membranes allowed their use in at least 20 consecutive adsorption/desorption cycles, without significant loss of their characteristics. We suggest that the physical-chemical characteristics of PEDOT make these hybrid mats a promising adsorbent material for use in water remediation protocols and effluent treatment systems. 相似文献
35.
Guimarães Barbara Maria Ribeiro Scatolino Mário Vanoli Martins Maria Alice Ferreira Saulo Rocha Mendes Lourival Marin Lima José Tarcísio Junior Mario Guimarães Tonoli Gustavo Henrique Denzin 《Environmental science and pollution research international》2022,29(6):8665-8683
Environmental Science and Pollution Research - The growing demand for products with lower environmental impact and the extensive applicability of cellulose nanofibrils (CNFs) have received... 相似文献
36.
Schumacher Aécio G. Gomes Guilherme J. C. Schneider Denise S. G. Pires Patrício J. M. Gomes Ruan G. S. 《Journal of Material Cycles and Waste Management》2022,24(6):2555-2568
Journal of Material Cycles and Waste Management - The use of industrial byproducts as replacement of natural aggregates has been extensively investigated to design eco-friendly roads. One of the... 相似文献
37.
Juliana Aparecida Diniz Leonardo Luiz Okumura Herbert Aleixo Alexandre Gurgel Astréa Filomena Souza Silva 《Journal of environmental science and health. Part. B》2020,55(6):583-591
AbstractAn original voltammetric screening method, employing glassy carbon electrode (GCE) with the differential-pulse voltammetry technique (DPV), has been developed to determine residues of the anti-parasitic agent Ronidazole (RNZ) in bovine meat. By using cyclic voltammetry (CV), it has been demonstrated that an irreversible cathodic process occurs at approximately ?0.740?V (vs. Ag|AgCl, KCl 3?mol L?1) in a 0.100?mol L?1 phosphate buffer at pH 6.5 as supporting electrolyte. Furthermore, the behavior of RNZ in CV indicates the occurrence of a diffusion mass transfer process to the working electrode surface. The RNZ reduction mechanism was proposed as a 6-electron transfer, similar to Metronidazole under the same pH range. Quantification of RNZ and method validation were then carried out by DPV. The relative standard deviation (RSD) were 3.21% for intraday precision of 10 consecutive repetitions and 6.78% for interday precision after five analysis. Limits of detection and quantification were also obtained, and the values were 0.107 and 0.358?mg kg?1, respectively. The recovery percentage for three different concentrations of RNZ in the bovine meat matrix ranged between 98.1% and 100.3%. The method proved to be efficient for screening RNZ in bovine meat. 相似文献
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Juliana Rangel Sean R. Griffin Thomas D. Seeley 《Behavioral ecology and sociobiology》2010,64(6):979-987
Animals that travel in groups must synchronize the timing of their departures to assure cohesion of the group. While most
activities in large colonies of social insects have decentralized control, certain activities (e.g., colony migration) can
have centralized control, with only a special subset of well-informed individuals making a decision that affects the entire
colony. We recently discovered that a small minority of individuals in a honeybee colony—an oligarchy—decides when to trigger
the departure of a swarm from its hive. The departure process begins with some bees producing the worker-piping signal (the
primer for departure) and is followed by these bees producing the buzz-run signal (the releaser for departure). In this study,
we determined the identity of these signalers. We found that a swarm’s nest-site scouts search for potential nest cavities
prior to the departure of the swarm from its hive. Furthermore, we found that the predeparture nest-site scouts are the sole
producers of the worker-piping signal and that they are the first producers of the buzz-run signal. The control of the departure
of a honeybee swarm from its hive shows how a small minority of well-informed individuals in a large social insect colony
can make important decisions about when a colony should take action. 相似文献
40.
Pavlova Ekaterina Pashkunova-Martic Irena Schaier Martin Petrova Emilia Gluhcheva Yordanka Dorkov Peter Helbich Thomas H. Keppler Bernhard Koellensperger Gunda Ivanova Juliana 《Environmental science and pollution research international》2021,28(6):6784-6795
Environmental Science and Pollution Research - In this study, we compare the effects of deferiprone (Def) and tetraethylammonium salt of salinomycinic acid (Sal) on lead (Pb)-induced toxicity in... 相似文献