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Romain Métivier Isabelle Bourven Jérome Labanowski Gilles Guibaud 《Environmental science and pollution research international》2013,20(10):7275-7285
Extracellular polymeric substances (EPS) are, along with microbial cells, the main components of the biological sludges used in wastewater treatment and natural biofilms. EPS play a major role in removing pollutants from water by means of sorption. The ability of soluble EPS (S-EPS) and bound EPS (B-EPS) derived from various bacterial aggregates (flocs, granules, biofilms) to bind at pH 7.0?±?0.1 to two pharmaceutical substances, acetaminophen (ACE) and erythromycin ethylsuccinate (ERY), has been investigated using the fluorescence quenching method. Two intense fluorescence peaks, A (Ex/Em range, 200–250/275–380 nm) and B (Ex/Em range, 260–320/275–360 nm), corresponding respectively to the aromatic protein region and soluble microbial by-product-like region, were identified in a three-dimensional excitation-emission matrix of EPS samples. The fluorescence peak, which corresponds to humic-like substances, was also identified though at low intensity. The ability of EPS to bind ACE was found to exceed that for ERY. The aromatic protein fraction of EPS displays a slightly higher affinity for drugs than that shown by the soluble microbial by-product-like fraction. The S-EPS and B-EPS present the same affinity for ACE and ERY. The effective quenching constants (log K) derived from the Stern–Volmer Equation equaled at peak A (with S-EPS): 3.7?±?0.2 to 4.0?±?0.1 for ACE and 2.1?±?0.3 to 2.7?±?0.1 for ERY. With B-EPS, these values were 3.9?±?0.1 to 4.0?±?0.1 for ACE and 2.0?±?0.2 to 2.6?±?0.1 for ERY. Our results suggest that the weaker EPS affinity for ERY than for ACE serves to partially explain why only about 50–80 % of ERY is removed from wastewater at the treatment plant. Moreover, this work demonstrates that EPS from natural river biofilms are able to bind drugs, which in turn may limit the mobility of drugs in natural waters. 相似文献
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Gauquelin Thierry Michon Geneviève Joffre Richard Duponnois Robin Génin Didier Fady Bruno Bou Dagher-Kharrat Magda Derridj Arezki Slimani Said Badri Wadi Alifriqui Mohamed Auclair Laurent Simenel Romain Aderghal Mohamed Baudoin Ezekiel Galiana Antoine Prin Yves Sanguin Hervé Fernandez Catherine Baldy Virginie 《Regional Environmental Change》2018,18(3):623-636
Regional Environmental Change - Mediterranean forests are found in the Mediterranean basin, California, the South African Cape Province, South and southwestern Australia and parts of Central Chile.... 相似文献
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Polar organic chemical integrative sampler (POCIS): application for monitoring organic micropollutants in wastewater effluent and surface water 总被引:1,自引:0,他引:1
Miège C Budzinski H Jacquet R Soulier C Pelte T Coquery M 《Journal of environmental monitoring : JEM》2012,14(2):626-635
In this paper, we discuss the advantages and drawbacks of POCIS (Polar Organic Chemical Integrative Sampler) for the evaluation of river water quality downstream of wastewater treatment plants. POCIS proved well adapted to sampling alkylphenols and several pharmaceuticals. Concentration factors and the decrease in limits of quantification, compared to grab water sample analyses, were significant except for hormones, β-blockers and bronchodilators. Promising preliminary results obtained in situ on deuterated atenolol used as a performance reference compound need to be confirmed in-lab. This work confirms that POCIS is a valuable tool for monitoring hydrophilic organic molecules in river and wastewaters. 相似文献
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Sinking of military ships, dumping of munitions during the two World Wars, and military training have resulted in the undersea deposition of numerous unexploded ordnances (UXOs). Leaching of energetic compounds such as hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) from these UXOs may cause adverse ecological effects so that the long-term fate of these chemicals in the sea should be known. The present study assesses the contribution of alkaline hydrolysis into the natural attenuation of RDX and HMX in coastal waters. Alkaline hydrolysis rates were shown to be unaffected by the presence of sodium chloride, the most common component in marine waters. Kinetic parameters (E(a), ln A, k(2)) quantified for the alkaline hydrolysis of RDX and HMX in deionized water (30-50 degrees C, pH 10-12) agreed relatively well with abiotic degradation rates determined in sterilized natural coastal waters (50 and 60 degrees C, variable salinity) even if the latter were generally slightly faster than the former. Furthermore, similar products (HCHO, NO(2)(-), O(2)NNHCH(2)NHCHO) were obtained on alkaline hydrolysis in deionized water and abiotic degradation in coastal waters. These two findings suggested that degradation of nitramines in sterilized natural coastal waters, away from light, was mainly governed by alkaline hydrolysis. Kinetic calculations using the present parameters showed that alkaline hydrolysis of RDX and HMX in marine waters at 10 degrees C would respectively take 112 +/- 10 and 2408 +/- 217 yr to be completed (99.0%). We concluded that under natural conditions hydrolysis should not contribute significantly to the natural attenuation of HMX in coastal waters whereas it could play an active role in the natural attenuation of RDX. 相似文献
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Estienney Marie Daval-Frerot Philippe Aho-Glélé Ludwig-Serge Piroth Lionel Stabile Pascal Gerbet Jean-Yves Rouleau Romain de Rougemont Alexis Belliot Gaël 《Food and environmental virology》2022,14(2):217-221
Food and Environmental Virology - Disinfection of hospital facilities and ambulances is an important issue for breaking the chain of transmission of viral pathogens. Hydrogen peroxide has provided... 相似文献
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Two mammalian hairs have been found in association with an empty puparium in a ∼100-million-year-old amber (Early Cretaceous)
from France. Although hair is known to be an ancestral, ubiquitous feature in the crown Mammalia, the structure of Mesozoic
hair has never been described. In contrast to fur and hair of some Jurassic and Cretaceous mammals preserved as carbonized
filaments, the exceptional preservation of the fossils described here allows for the study of the cuticular structure. Results
show the oldest direct evidence of hair with a modern scale pattern. This discovery implies that the morphology of hair cuticula
may have remained unchanged throughout most of mammalian evolution. The association of these hairs with a possible fly puparium
provides paleoecological information and indicates peculiar taphonomic conditions. 相似文献