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311.
Poirier Larabie Sylvie Jutras Martin Leclair Grégoire St-Jean Isabelle Kleinert Christine Gagné François Gagnon Christian 《Environmental science and pollution research international》2022,29(30):45303-45313
Environmental Science and Pollution Research - Aquatic organisms are continuously exposed to emerging contaminants coming from urban effluents of wastewater treatment plants. The contamination of... 相似文献
312.
Christine S. Couturier Alice Rouault David McKenzie Robert Galois Serge Robert Lucette Joassard Guy Claireaux 《Marine Biology》2007,152(4):803-814
The French Atlantic coast contains large highly productive intertidal mudflats that are colonised by juveniles of numerous
flatfish species, including the common sole (Solea solea, L.). These ecosystems are also heavily exploited by the shellfish farming industry. Intensive bivalve culture is associated
with substantial biodeposition (1–6 t-dw ha−1 day−1), which directly or indirectly contributes to increase exopolysaccharide (EPS) concentrations at the interface between water
column and seabed. EPS are long-chain molecules organised into colloids, which influence rheological properties of water,
particularly viscosity. Increased water viscosity had consequences for ventilatory activity of juvenile flatfish, whereby
the minimal pressure required to ventilate the medium increases directly with EPS concentration. Moreover, the critical EPS
concentration ([EPS]crit) at which water was no longer able to flow through the branchial basket ranged from almost nil to over 30 mg l−1, depending on species and size. [EPS]crit was lower in small individuals and individuals from species with high metabolic rates (turbot and plaice). These differences
may depend upon gill and bucco-branchial cavity morphometrics. The ventilatory workload of sole increased with viscosity to
a maximum at 2 mg EPS l−1. Viscosity might, therefore, be a limiting factor for flatfish post larvae, which colonise the intertidal mudflats, depending
upon their size and species. EPS concentrations in the field can reach 15 mg l−1. A selective effect is conceivable but remains to be estimated in the field. 相似文献
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315.
Christine Wallgren 《Local Environment》2006,11(2):233-251
This study compares energy use for food transport to a farmers' market in Sweden with energy use for transport in the conventional food system. The farmers' market was investigated through data sampling from on-site investigations. The conventional food system was studied with the aid of life cycle assessments reported in the literature. Overall, the study found no significant differences in levels of energy use for transport to the farmers' market compared with the conventional food system. For certain products, such as fresh fruits and vegetables, transport-related energy use was much lower in the local system although the season in Sweden for this kind of product is restricted to two or three months at the end of the summer. However, there is considerable potential to increase energy efficiency in local food systems by organizing the selling in new ways and by using more energy efficient vehicles. 相似文献
316.
Vincent Chatain Mostafa Benzaazoua Marie Loustau Cazalet Hassan Bouzahzah Cécile Delolme Mathieu Gautier Denise Blanc Christine de Brauer 《Environmental science and pollution research international》2013,20(1):51-59
The environmental assessment of potential effects of contaminated harbor sediments stabilized with hydraulic binders and the determination of remediation endpoints require the determination of pollutants leaching potentials. Moreover, little information about the speciation and mobility of inorganic contaminants in these specific solid matrices is available in the literature. The objective of this paper is to investigate the relationship between mineralogy and leachability of contaminants (copper, lead, and zinc) present in a French harbor sediment stabilized with quicklime and Portland cement. Batch equilibrium leaching tests at various pH, chemical analysis of leachates, and mineralogical studies (X-ray diffraction, scanning electron microscopy–energy dispersive spectroscopy, and diffuse reflectance infrared Fourier transform) have been combined in the present investigation. The acid neutralization capacity of the stabilized matrix studied is first controlled by the dissolution of portlandite (pH?~12), followed by the dissolution of C–S–H (pH?~11) and the dissolution of ettringite (pH?~10). Finally, a very high buffering capacity of this stabilized sediment is observed for pH values around 6. This equilibrium is mainly controlled by the dissolution of iron sulfides and carbonate minerals. Consequently, the mobilization of inorganic contaminants as a function of pH remains very low (<0.1 wt%) for pH values above 6 and significantly increases for pH below these values. This research confirms the importance of a combined methodology for the intrinsic characterization of potential mobilization of contaminants in a stabilized sediment and for a better understanding of geochemical processes that affect contaminant fate, transformation, and transport in the subsurface environment. 相似文献
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Hélène Duval Laurence Michel-Calemard Marie Gonzales Philippe Loget Claire Beneteau Annie Buenerd Madeleine Joubert Marielee Denis-Musquer Alix Clemenson Anne-Laure Chesnais Sophie Blesson Isabelle De Pinieux Anne-Lise Delezoide Gheorghe Bonyhay Christine Bellanné-Chantelot Laurence Heidet Florence Dupré Sophie Collardeau-Frachon 《黑龙江环境通报》2016,36(8):744-751
319.
320.
Christine A. Davey 《补救:环境净化治理成本、技术与工艺杂志》1998,8(2):55-74
A promising new technology for the detection of dense nonaqueous phase liquids, or DNAPLs, is cosolvent injection/extraction. Cosolvents, such as alcohols, are injected into the subsurface and interact with DNAPLs to increase their aqueous solubility, which increases recovery of the chemicals. A laboratory assessment was performed to determine if incorporating this technology with cone penetrometers could provide a useful sampling tool for DNAPL detection. A cone penetrometer was modeled in the laboratory by injecting and extracting small quantities of ethanol and propylene glycol at low concentrations into a homogeneous sand reactor contaminated with a residual saturation of tetrachloroethene (PCE). Experimental test results show that this technology is extremely sensitive to the vertical placement of the sampler, but is capable of enhancing PCE solubility while recovering most of the alcohol injected. Field testing of this technology will provide the next step in determining the feasibility of this technology for DNAPL detection. 相似文献