Download or read book Impact des rejets de cuivre et zinc en milieu aquatique written by Ingrid Vinot and published by . This book was released on 2004 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de la recherche est d'évaluer l'impact d'un apport en cuivre et en zinc (dont l'origine est la corrosion des échangeurs en laiton du circuit de refroidissement (CRF) d'une centrale nucléaire) sur deux systèmes aquatiques, une retenue de barrage et la rivière Moselle. Ces deux écosystèmes présentent des niveaux de contamination différents, la retenue recevant directement les eaux de purge du CRF avant leur rejet en Moselle. Une étude complète de la distribution, de la circulation et des transferts (quantification des flux) des métaux cuivre et zinc est réalisée in situ dans les compartiments abiotiques (eau - matières décantées - sédiments) de la retenue du Mirgenbach. La spéciation du cuivre dans les sédiments du CRF, de la retenue et de la rivière est abordée via une technique d'extraction séquentielle ; complétée par une caractérisation des sédiments et une analyse des minéraux. Ces techniques ont démontré le rôle majeur des fractions oxydable, réductible et acidosolubie dans le piégeage du cuivre et du zinc dans les sédiments. Le rôle des sulfures dans la liaison et la mobilité du cuivre dans les sédiments et les matières décantées est discuté. Conjointement, un suivi mensuel de la biodisponibilité du cuivre et du zinc pour les organismes autochtones est conduit durant deux ans, sur la rivière Moselle et sur la retenue, pour mieux comprendre l'impact des facteurs biotiques (taille des organismes, cycle biologique) et des facteurs abiotiques (saisons, contamination du milieu) sur les niveaux de bioaccumulation avec mise en évidence des profils d'accumulation (régulation, accumulation avec ou sans excrétion, variation interspécifiques des profils). Globalement ces deux métaux sont accumulés dans les organismes jusqu'à des niveaux élevés pouvant atteindre dans le cas du cuivre et dans la retenue du Mirgenbach des valeurs de 952 mg Culkg de ms chez Dreissena. Tous les organismes étudiés présentent des niveaux de bioaccumulation caractéristiques du niveau de contamination des sites. Les taux d'accumulation les plus élevés sont mesurés en automne-hiver et ceci s'explique par le fonctionnement cyclique des organismes. Les différences interspécifiques de bioaccumulation sont expliquées, entre autres, par des différences d'habitat, de nutrition, de physiologie. L'absence de corrélation entre le niveau de bioaccumulation et la concentration métallique dans le milieu est surtout le fait, notamment en rivière, de la non représentativité des échantillons ponctuels d'eau brute et de la difficulté d'identifier les sources de contamination (eau, sédiments, alimentation). Parallèlement à ces travaux, des mollusques bivalves non contaminés (C. ji'uminea et D. polymorpha) sont transférés (biosurveillance active) dans 4 stations, trois stations Moselle et une station Mirgenbach. Les mesures de la bioaccumulation des métaux par ces mollusques révèlent des cinétiques de contamination rapides, notamment dans le cas du cuivre, à partir du cuivre et du zinc présents dans le milieu. L'utilisation de la technique de biosurveillance active a permis de valider l'utilisation des transferts de corbicules et de dreissènes pour réaliser un suivi de l'état de contamination en lac et en rivière. La corbicule présente, par rapport à la dreissène, l'avantage de se trouver à l'interface eau-sédiments et, dans le cas du zinc, fournit une information plus spécifique du niveau de contamination que la dreissène. Le zinc, aux concentrations mesurées aux différentes stations, ne semble pas générer de risques toxiques pour la biocoenose qui présente dans l'ensemble des systèmes de régulation efficaces. L'absorption du zinc est fortement dépendante des conditions du milieu et de la biologie des espèces. Les risques pour la biocoenose liés à l'apport en cuivre sont abordés via une étude complète de la distribution, de la circulation et des transferts du cuivre in situ dans les différents compartiments biotiques autochtones de la retenue. La biodisponibilité du cuivre est démontrée pour tous les organismes étudiés, de même que l'existence de quelques voies de biomagnification dans la chaîne trophique. Les effets toxiques du cuivre à long terme se traduisent par une diminution de la production planctonique et la disparition d'espèces sensibles (Hydrodictyon, Aphanizomenon), conformément aux prédictions de la grille du SEQ - eau pour de telles concentrations dans l'eau brute. Le niveau de contamination de la retenue augmente depuis sa mise en eau en 1985 et ceci est le fait d'une libération croissante de cuivre par corrosion des condenseurs en laiton. II apparaît que les sédiments de la retenue fonctionnent comme un piège a cuivre et zinc en limitant l'impact sur la rivière Moselle

Download or read book Contamination du milieu aquatique au Qu bec m ridional en 1980 arsenic cadmium chrome cuivre mercure nickel plomb zinc written by and published by . This book was released on 1984 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impact des rejets urbains et industriels de la r gion Toulouse sud sur l cosyst me aquatique de la Saudrune written by Martine Guilmet and published by . This book was released on 1988 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Notre travail, avec pour but la préoccupation de la protection du milieu aquatique, nous a conduit à étudier différents aspects successifs du problème : 1. Qualité physico-chimique des eaux : les données sur l'eau, malgré leur part d'incertitude sont nécessaires et représentent une base essentielle car en relation directe avec les données de rejets sur lesquelles peuvent s'exercer les actions de dépollution. 2. Etude de la micropollution métallique dans les sédiments : ils représentent un des éléments intégrateurs du milieu et permettent de faire face à certains problèmes liés à l'étude de la physico-chimie des eaux. 3. Tests écotoxicologiques : l'intérêt de ces test pour l'évaluation globale de la toxicité est manifeste. La pollution chimique est formée, pour le site qui nous préoccupe, d'un ensemble très complexe de molécules difficiles à identifier complètement. De plus, les différentes actions entre les substances rendent la prévision d'effets toxiques, impossible par l'analyse chimique. 4. Etudes des populations benthiques et piscicoles : ils représentent les autres éléments intégrateurs du milieu et sont la réponse biologique, indispensable à connaître, des différentes atteintes du milieu.

Download or read book CIESM Congress Proceedings written by International Commission for the Scientific Exploration of the Mediterranean Sea. Congress and published by . This book was released on 2001 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling in Aquatic Chemistry written by OECD Nuclear Energy Agency and published by Nuclear Energy Agency. This book was released on 1997 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guidelines for Drinking water Quality written by World Health Organization and published by World Health Organization. This book was released on 1993 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume describes the methods used in the surveillance of drinking water quality in the light of the special problems of small-community supplies, particularly in developing countries, and outlines the strategies necessary to ensure that surveillance is effective.

Download or read book Erasmus Contarini and the Religious Republic of Letters written by Constance M. Furey and published by Cambridge University Press. This book was released on 2006 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2005 book examines how the religious search for meaning shaped contemporary assumptions about friendship, gender, reading and writing.

Download or read book Environmental Code of Practice for Metal Mines written by Canada. Environment Canada and published by . This book was released on 2009 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes operational activities and associated environmental concerns of this industrial sector. The document applies to the complete life cycle of mining, from exploration to mine closure, and environmental management practices are recommended to mitigate the identified environmental concerns. The recommended practices in the Code include the development and implementation of environmental management tools, the management of wastewater and mining wastes, and the prevention and control of environmental releases to air, water and land. The Code of Practice will be adopted by Environment Canada and others as a guidance document that recommends environmental protection practices for the mine life cycle. The Code applies specifically to metal mines but will provide useful guidance for all sectors of the mining industry.

Download or read book Arsenic in Drinking Water written by National Research Council and published by National Academies Press. This book was released on 2001-11-26 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Having safe drinking water is important to all Americans. The Environmental Protection Agency's decision in the summer of 2001 to delay implementing a new, more stringent standard for the maximum allowable level for arsenic in drinking water generated a great deal of criticism and controversy. Ultimately at issue were newer data on arsenic beyond those that had been examined in a 1999 National Research Council report. EPA asked the National Research Council for an evaluation of the new data available. The committee's analyses and conclusions are presented in Arsenic in Drinking Water: 2001 Update. New epidemiological studies are critically evaluated, as are new experimental data that provide information on how and at what level arsenic in drinking water can lead to cancer. The report's findings are consistent with those of the 1999 report that found high risks of cancer at the previous federal standard of 50 parts per billion. In fact, the new report concludes that men and women who consume water containing 3 parts per billion of arsenic daily have about a 1 in 1,000 increased risk of developing bladder or lung cancer during their lifetime.

Download or read book Soil Contamination written by Marcelo L. Larramendy and published by BoD – Books on Demand. This book was released on 2021-06-23 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book, Soil Contamination - Threats and Sustainable Solutions, is intended to provide an update on different aspects of soil contamination exerted by a multiplicity of exogenous and endogenous causes. We hope that this book will continue to increase information from diverse sources and to give some real-life examples, extending the appreciation of the complexity of this subject in a way that may stimulate new approaches in relevant fields.

Download or read book Fishery Products written by Hartmut Rehbein and published by John Wiley & Sons. This book was released on 2009-11-16 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Food quality and safety issues continue to dominate the press, with most food companies spending large amounts of money to ensure that the food quality and assessment procedures in place are adequate and produce good and safe food. This holds true for companies and laboratories responsible for the processing of fish into various products, those responsible for researching safe new products, and departments within other companies supporting these functions. Fishery Products brings together details of all the major methodologies used to assess the quality of fishery products in the widest sense. Subject coverage of this important book includes chapters on assessment of authenticity, and several chapters on quality assessment using various methods, such as: Texture measurement Electronic nose and tongue NMR Colour measurement This timely volume will serve as a vital tool for all those working in the processing of fishery and aquaculture products: including laboratory personnel working in regulatory bodies, food quality control personnel, food scientists, food technologists, nutritionists, seafood trade bodies, seafood labelling regulatory bodies, government food protection agencies and environmental health personnel. Libraries in research establishments and universities where food science, food technology, nutrition, aquaculture, fisheries and biological sciences are studied and taught should have copies of this important publication on their shelves.

Download or read book Improving Farmed Fish Quality and Safety written by Øyvind Lie and published by Elsevier. This book was released on 2008-08-20 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global aquaculture production has grown rapidly over the last 50 years. It is generally accepted that there is limited potential to increase traditional fisheries since most fish stocks are well or fully exploited. Consequently increased aquaculture production is required in order to maintain global per capita fish consumption at the present level. Fish farming enables greater control of product quality and safety, and presents the possibility of tailoring products according to consumer demands. This important collection reviews safety and quality issues in farmed fish and presents methods to improve product characteristics.The first part of the book focuses on chemical contaminants, chemical use in aquaculture and farmed fish safety. After an opening chapter discussing the risks and benefits of consumption of farmed fish, subsequent contributions consider environmental contaminants, pesticides, drug use and antibiotic resistance in aquaculture. Part two addresses important quality issues, such as selective breeding to improve flesh quality, the effects of dietary factors including alternative lipids and proteins sources on eating quality, microbial safety of farmed products, parasites, flesh colouration and off-flavours. Welfare issues and the ethical quality of farmed products are also covered. The final part discusses ways of managing of product quality, with chapters on HACCP, monitoring and surveillance, authenticity and product labelling.With its distinguished editor and international team of contributors, Improving farmed fish quality and safety is a standard reference for aquaculture industry professionals and academics in the field. - Reviews safety and quality issues in farmed fish and presents methods to improve product characteristics - Discusses contaminants, persistent organic pollutants and veterinary drug residues and methods for their reduction and control - Addresses important quality issues, genetic control of flesh characteristics and the effects of feed on product nutritional and sensory quality

Download or read book Chemical Thermodynamics of Neptunium and Plutonium written by Robert J. Lemire and published by Elsevier. This book was released on 2001-08-26 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike earlier books in this series, this review describes the selection of chemical thermodynamic data for species of two elements, neptunium and plutonium. Although this came about more by circumstance than design, it has allowed for a more consistent approach to chemical interpretation than might have occurred in two separate treatments. It has also drawn attention to cases where the available data do not show expected parallels, and where further work may be useful to confirm or refute apparent differences in the behaviour of neptunium and plutonium.

Download or read book FeHEDTA written by Canada. Pest Management Regulatory Agency and published by . This book was released on 2010 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Health Canada's Pest Management Regulatory Agency (PMRA), under the authority of the Pest Control Products Act and Regulations, is proposing full registration for the sale and use of NEU1173H TGAI and the end-use products; NEU1173H RTU with Pull'N Spray Applicator, NEU1173H RTU with Quick Connect Sprayer, NEU1173H RTU, Fiesta Lawn Weed Killer Ready to Spray, Fiesta Lawn Weed Killer, NEU1173H Ready to Spray Large Size, NEU1173H Ready to Spray, NEU1173H Large Size, and NEU1173H, containing the technical grade active ingredient iron present as FeHEDTA (herein referred to as FeHEDTA), to control several broadleaved weed species that commonly occur in turf. This document summarizes PMRA's evaluation. The Overview describes the key points of the evaluation, while the Science Evaluation provides detailed technical information on the human health, environmental and value assessments of NEU1173H TGAI and the end-use products. Before making a final registration decision on FeHEDTA, the PMRA will consider all comments received from the public in response to this consultation document.--Includes text from document.

Download or read book Management of Environment written by Bhupendra Patel and published by . This book was released on 1980 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Festschrift honoring Anil Kumar Ganguly, b. 1908, radiation chemist; comprises articles most on pollution control.

Download or read book Nature and Culture in the Democratic Republic of Congo written by and published by . This book was released on 2004 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical Thermodynamics of Americium written by R.J. Silva and published by Newnes. This book was released on 2012-12-02 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second volume in a series of critical reviews of the chemical thermodynamic data of those elements of particular importance in the safety assessment modeling of high-level radioactive waste storage and disposal facilities. The objective of these reviews is to provide a set of reliable thermodynamic data that can be used to describe the behaviour of these elements under conditions relevant for radioactive waste disposal systems and the geochemical environments. The present volume is a review of experimental data reported in the literature for americium. On a few occasions, where no data existed, comparisons and estimates were made based on experimental data on analog lanthanide elements. The basic philosophy was to develop a minimum set of solid phases and solution species of americium that would fit all experimental data being reviewed.