Author: HAMID.. HUSSAIN MASSOUD
Publisher:
ISBN:
Category :
Languages : fr
Pages : 109

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LE PROBLEME DE L'ANALYSE DES SULFONATES PAR DIVERSES TECHNIQUES CHROMATOGRAPHIQUES UTILISANT DES PHASES STATIONNAIRES DE TYPES SILICE, SILICE GREFFEE POLAIRE ET SILICE GREFFEE APOLAIRE, EST D'ABORD ETUDIE. L'ETUDE CHROMATOGRAPHIQUE DES DIALKYLDITHIOPHOSPHATES METALLIQUES EST ENSUITE ABORDEE. LA MISE EN OEUVRE DE DIFFERENTS SYSTEMES CHROMATOGRAPHIQUES, AINSI QUE DE DIFFERENTS MOYENS DE DETECTION (PAR REFRACTOMETRIE DIFFERENTIELLE, PAR ABSORPTIOMETRIE DANS L'UV, PAR VOIE ELECTROCHIMIQUE) PERMET DE DISTINGUER CES CONSTITUANTS SELON LEURS CHAINES ALKYLES ET SELON LA NATURE DU METAL. ENFIN, LA DEGRADATION DE CETTE DERNIERE CLASSE D'ADDITIFS, EST ETUDIEE DANS LE BUT DE METTRE AU POINT DES TECHNIQUES ANALYTIQUES DEVANT PERMETTRE DE MIEUX COMPRENDRE LES MECANISMES D'ACTION DE CES COMPOSES

Author: Zlatka Gallot
Publisher:
ISBN:
Category :
Languages : fr
Pages : 162

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Author: Gérard Crétier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 146

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Book Description
COMPARAISON DE DIFFERENTS MODELES DE FONCTIONNEMENT DE LA COLONNE. LE MODELE DE HAARKOFF-VAN DER LINDE EST LE PLUS VALABLE SUR LE PLAN EXPERIMENTAL. ON EN DEDUIT UNE METHODE DE CALCUL DES COLONNES QUI TIENT COMPTE A LA FOIS DE L'OBJECTIF A ATTEINDRE (CONCENTRATION, PURETE) ET DES CONTRAINTES INSTRUMENTALES

Author: Robert Farinotti
Publisher:
ISBN:
Category :
Languages : fr
Pages : 318

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Author: Nazim Mekaoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

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Book Description
La chromatographie à contre courant (CCC) est une technique de purification chimique préparative quitravaille avec un système biphasique liquide. Une phase est la phase mobile, l'autre phase est la phasestationnaire. Il n'y a aucun support solide: un champ de force centrifuge est utilisé pour maintenir en place laphase stationnaire. Ce travail est une contribution à l'étude de la purification préparative par CCC. Après uneimportante étude bibliographique des procédés de purification en continu tant en CCC qu'autres, il est montréque la méthode dite "multi-dual-mode", ou MDM, est une solution possible. Elle consiste à utiliser le fait queles deux phases liquides peuvent servir de phase stationnaire: il suffit d'inverser le sens de circulation et lanature de la phase mobile (méthode dual-mode). Le mélange est séparé de façon classique pendant untemps chronométré, puis on inverse le rôle des phases: la phase mobile devient stationnaire et vice versa eton inverse également le sens de circulation (ascendant devient descendant ou vice versa). On sort lescomposants du mélange soit d'un coté de la colonne CCC, soit de l'autre. La méthode est mise en oeuvrepour purifier le Bleu de Coomassie en le débarassant des ses composés polaires (d'un coté) et apolaire (del'autre coté de la colonne et en accumulant dans la colonne la fraction de polarité intermédiaire, fractiond'intérêt. Une nouvelle colonne hydrostatique de petit volume (30 mL) a également été testée: elle permetde tester un nouveau système liquide très rapidement.

Author: Alfonso Jiménez
Publisher: Royal Society of Chemistry
ISBN: 1849738793
Category : Science
Languages : en
Pages : 374

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Book Description
A comprehensive overview of the synthesis, characterisation, properties and applications of poly(lactic acid) science and technology covering scientific, ecological, social and economic issues.

Author: Linda Strande
Publisher: IWA Publishing
ISBN: 1780404735
Category : Technology & Engineering
Languages : en
Pages : 428

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Book Description
It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309170435
Category : Nature
Languages : en
Pages : 241

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Book Description
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.

Author: David M. Robbins
Publisher: IWA Publishing
ISBN: 178040476X
Category : Science
Languages : en
Pages : 148

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Book Description
This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.

Author: Elizabeth Tilley
Publisher:
ISBN: 9783906484570
Category :
Languages : en
Pages : 176

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Book Description