Contribution à l'étude des arséniates de métaux trivalents PDF Download

Author: Michel Ronis
Publisher:
ISBN:
Category :
Languages : fr
Pages : 244

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Author: M.. SCREPEL
Publisher:
ISBN:
Category :
Languages : fr
Pages : 21

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PREPARATION D'ARSENIATES DOUBLES DE SODIUM ET D'UN METAL TRIVALENT (AL OU FE). COMPOSITION, PROPRIETES, PYROLYSE, STRUCTURE CRISTALLINE DE CES COMPOSES

Author: Robert Mas (chimiste).)
Publisher:
ISBN:
Category : Arsenates
Languages : fr
Pages : 50

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Nos connaissances sur les arséniates de cuivre sont d'ailleurs limitées : aucune étude d'ensemble n'a été effectuée et les essais opérés par les quelques auteurs qui se sont intéressés à cette question sont le plus souvent difficilement reproductibles, faute des précisions nécessaires. Il nous est donc apparu utile de reprendre l'étude systématique des arséniates de cuivre et, notamment, d'établir le diagramme d'équilibre [...] afin de déterminer avec certitude quels étaient les arséniates susceptibles d'exister ainsi que leurs conditions de stabilité. Ce premier travail, rendu délicat par l'existence d'équilibres métastables, nous a permis de caractériser des sels qui n'avaient pas été signalés. En présence d'espèces chimiques définies, nous avons pu aborder l'examen des propriétés physiques et chimiques des divers arséniates de cuivre ; en particulier l'étude de l'action de la chaleur et des réducteurs, non abordée jusqu'ici, nous a conduits à des résultats assez différents de ceux obtenus avec d'autres arséniates. La possibilité d'utiliser les réactions de double décomposition pour préparer ces sels nous a amenés à étudier l'action exercée sur ceux-ci par les solutions salines ; ceci nous a permis d'interpréter certains des résultats obtenus précedemment et de donner au problème général de la préparation des arséniates de cuivre, résolu jusqu'ici d'une façon assez empirique, une base rationnelle. Il convenait enfin, étant donné les applications éventuelles de ces produits en phytopharmacie, d'examiner les propriétés de ces sels en relation avec leur emploi comme insecticides.

Author: S V Krivovichev
Publisher: Springer Science & Business Media
ISBN: 3642200184
Category : Science
Languages : en
Pages : 424

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This book is a collection of papers that are devoted to various aspects of interactions between mineralogy and material sciences. It will include reviews, perspective papers and original research papers on mineral nanostructures, biomineralization, micro- and nanoporous mineral phases as functional materials, physical and optical properties of minerals, etc. Many important materials that dominate modern technological development were known to mineralogists for hundreds of years, though their properties were not fully recognized. Mineralogy, on the other hand, needs new impacts for the further development in the line of modern scientific achievements such as bio- and nanotechnologies as well as by the understanding of a deep role that information plays in the formation of natural structures and definition of natural processes. It is the idea of this series of books to provide an arena for interdisciplinary discussion on minerals as advanced materials.

Author:
Publisher:
ISBN:
Category : Mineralogy
Languages : en
Pages : 452

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Author: Zahid Amjad
Publisher: Springer Science & Business Media
ISBN: 1461555175
Category : Technology & Engineering
Languages : en
Pages : 509

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Calcium Phosphates in Biological and Industrial Systems provides a comprehensive discussion on calcium phosphates in the diverse areas of their applications. The authors are all respected specialists in their particular fields, possessing wide knowledge and experience and able to analyze recent results and relate them to their respective areas of expertise. New information, as well as a review of current concepts, highlights the individual contributions. Due to the broad scope of the subject covered and the large number of contributions, this book is divided into three parts. Whilst each section contains a basic theme, there is a considerable overlapping of ideas and approaches. This reflects the excitement and interdisciplinary nature of investigations by researchers interested in dissimilar aspects of calcium phosphates. Considering the general interest in calcium phosphates, Calcium Phosphates in Biological and Industrial Systems is directed at an audience of researchers in the fields of biology, chemistry, dentistry, geology, chemical engineering, environmental engineering, and medicine. It will also be useful to technology-focused researchers in industry whose investigations might be related directly or indirectly to calcium phosphates.

Author:
Publisher:
ISBN:
Category : Wood
Languages : en
Pages : 546

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

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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: Naturhistoriska riksmuseet (Sweden)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 232

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Author: Mohammed Bouabdellah
Publisher: Springer
ISBN: 3319317334
Category : Science
Languages : en
Pages : 585

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This volume presents an exhaustive overview of major orebodies and mineral deposits of North Africa. It is intended both for academic researchers and especially for exploration geologists interested in mineral exploration in the northern part of the African continent. Recent changes in the mining laws of most countries in this region have encouraged international mining companies to invest in local mineral industries. Accordingly, this volume will be very useful for these professionals, as well as for researchers in the field of economic geology.