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1.
Mar Pollut Bull ; 205: 116598, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38885576

RESUMEN

The concerning of plastic pollution in different ecosystems has been worsened by the widespread presence. Phthalate esters (PAEs), plasticizers found in everyday products, can migrate into the environment, especially into the oceans. Researches on their effects on cetaceans are still rare. Metabolomics helps assess perturbations induced by exposure to PAEs, which act as persistent endocrine disruptors. Four PAEs (dimethyl phthalate - DMP, diethyl phthalate - DEP, dibutyl phthalate - DBP, and di(2-ethylhexyl phthalate - DEHP) were analyzed, along with cholesterol and fatty acid profiles of P. blainvillei's blubber samples collected in southern Brazil. The study reveals pervasive contamination by PAEs - especially DEHP, present in all samples - with positive correlations between DEP content and animal size and weight, as well as between the DEHP amount and the C17:1 fatty acid. These findings will be relevant to conservation efforts aimed at this threatened species and overall marine ecosystems.


Asunto(s)
Delfines , Monitoreo del Ambiente , Ésteres , Metaboloma , Ácidos Ftálicos , Contaminantes Químicos del Agua , Animales , Brasil , Ácidos Ftálicos/metabolismo , Contaminantes Químicos del Agua/metabolismo , Contaminantes Químicos del Agua/análisis , Ésteres/análisis , Ésteres/metabolismo , Delfines/metabolismo , Tejido Adiposo/metabolismo , Dietilhexil Ftalato/metabolismo , Plastificantes , Disruptores Endocrinos/análisis , Masculino , Femenino , Dibutil Ftalato
2.
Environ Technol ; 44(7): 974-987, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-34605747

RESUMEN

In order to add value to the beach-cast Sargassum cymosum algae, its biomass was converted by pyrolysis process at 800°C into biochar, characterized and applied in the adsorption of Acetaminophen in batch and fixed-bed processes. Characterization by pH, Point of Zero Charge (pHPZC), Fourier-Transform Infrared Spectroscopy (FTIR), Thermogravimetric (TG), Scanning Electron Microscopy (SEM) and Surface area (BET) showed that the biochar presents properties favourable for the Acetaminophen adsorption. High surface area was obtained of 368.1 m². g-1, presenting the formation of pores, observed by SEM. The biochar showed basic characteristics (pH = 8.84 and pHPZC = 9.9), inferring an adsorption involving several different mechanisms such as dispersive interactions by π electrons, electrostatic attractions, and hydrophobic interactions. The adsorption mechanism is limited by chemisorption and governed by the formation of monolayer on the biochar surface, the Pseudo-second order kinetic and Langmuir-Freundlich isotherm model described the best behaviour of batch adsorption, with equilibrium and maximum adsorption capacity qe = 6.93 ± 0.07 mg. g-1 and qms = 12.34 ± 0.45 mg. g-1, respectively. Fixed-bed adsorption were performed varying adsorbent mass (0.3 and 0.6 g) and flow rate (2.5 and 5.0 mL. min-1), the best qy = 42.33 mg. g-1 found to adsorbent mass of 0.6 g and flow rate of 2.5 mL. min-1. Yan model described the best behaviour of the breakthrough curves data. Thus, the results provide insights into the development of adsorbents from beach-cast of Sargassum cymosum to adsorption of Acetaminophen, enhancing the use of environmental waste to obtain it.


Asunto(s)
Sargassum , Contaminantes Químicos del Agua , Acetaminofén , Adsorción , Contaminantes Químicos del Agua/química , Carbón Orgánico/química , Cinética , Espectroscopía Infrarroja por Transformada de Fourier , Concentración de Iones de Hidrógeno
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