Download or read book METHODES COMPLEXOMETRIQUES RAPIDES DE DOSAGE DE METAUX DANS LES EAUX PAR ABSORPTIOMETRIE U V VISIBLE written by Frédéric Theraulaz (Docteur en chimie).) and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LA MESURE SIMPLE DE LA CONCENTRATION DES METAUX DANS LES EAUX ET LES EFFLUENTS N'EST PAS FACILE, CAR LES METHODES SONT SOUVENT COMPLEXES ET COUTEUSES, OU NECESSITANT UN TEMPS OPERATOIRE IMPORTANT. NOUS PROPOSONS UNE NOUVELLE METHODE POUR LA DETERMINATION DU CUIVRE, DU FER, DU MERCURE ET DU CADMIUM DANS LES EAUX ET/OU LES EFFLUENTS. LA METHODE EST BASEE SUR UNE MESURE SPECTROPHOTOMETRIQUE INDIRECTE APRES UNE REACTION TRES RAPIDE DUE A L'EMPLOI D'UN SEUL REACTIF. LE MEME REACTIF EST EMPLOYE POUR LA DETERMINATION SIMULTANEE DU CUIVRE ET DU FER, MAIS DES REACTIFS, SPECIFIQUES SONT UTILISES POUR LE MERCURE ET LE CADMIUM. LA COMPOSITION GENERALE DE CES REACTIFS CONSISTE EN UN MELANGE DE LIGANDS (UN AGENT CHELATANT POUR LE METAL, LES AUTRES SERVANT D'AGENTS MASQUANTS POUR LES IONS INTERFERENTS) D'ALCOOL ETHYLIQUE ET D'AUTRES COMPOSES POUR TAMPONNER LE PH. LA PROCEDURE ANALYTIQUE EST TRES SIMPLE CAR LE REACTIF EST DIRECTEMENT AJOUTE A L'ECHANTILLON (1/5 V/V) ET LE SPECTRE EST INSTANTANEMENT ACQUIS POUR LE CALCUL DE LA CONCENTRATION. LES CARACTERISTIQUES DES METHODES SONT PROCHES DE CELLES OBTENUES PAR SPECTROMETRIE D'ABSORPTION ATOMIQUE. LES RESULTATS DE LA COMPARAISON ENTRE CES METHODES ET DES ANALYSES DE REFERENCES MONTRENT UNE BONNE CORRELATION POUR LES DIFFERENTS ECHANTILLONS TESTES. UN GRAND NOMBRE D'INTERFERENCES EST ELIMINE, EXCEPTE LORS DE LA MESURE DU FER DANS LES EAUX NATURELLES PRESENTANT UNE IMPORTANTE CONCENTRATION EN SUBSTANCES HUMIQUES: CES DERNIERES POSSEDENT DES COMPLEXES PLUS STABLES QUE CEUX FORMES AVEC LE REACTIF SPECIFIQUE. NEANMOINS, CES METHODES CONVIENNENT PARFAITEMENT POUR LA MESURE EN CONTINU, COMPTE TENU DE LA FACILITE D'EXECUTION ET DU FAIBLE COUT DE L'EQUIPEMENT REQUIS

Download or read book UV Visible Spectrophotometry of Water and Wastewater written by Olivier Thomas and published by Elsevier. This book was released on 2017-06-14 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: UV-Visible Spectrophotometry of Water and Wastewater, Second Edition, represents an update to the first book dedicated to the use of UV spectrophotometry for water and wastewater quality monitoring. Using practical examples, the book illustrates how this technique can be a source of new methods of characterization and measurement. Easy and fast to run, this simple and robust analytical technique must be considered as one of the best ways to obtain a quantitative estimation of specific or aggregate parameters (e.g., Nitrate, TOC) and simultaneously qualitative information on the global composition of water and its variation. This second edition presents the current methods and applications for water quality monitoring based on UV spectra, including the most recent works and developments. After the introduction of the basics for UV spectrophotometry understanding, the applications of UV measurement are presented, both from the family of chemicals and water quality parameters and from the type of water. Writing from years of experience in the development and applications of UV systems and from scientific and technical works, the authors provide several useful examples showing the great interest of UV spectrophotometry for water quality monitoring. At the end of the book, the UV spectra library of the first edition is updated with dozens of new chemicals of interest. - Adds dozens of new chemicals of interest to the first library of UV-spectra dedicated to water, providing data readily available for researchers and users - Includes new sections on data integrity and security, UV estimation of classes of compounds, UV and turbidity, drinking water, pollution tracking, high frequency monitoring, disinfection by products assessment, pesticides, pharmaceuticals, and more - Provides a theoretical basis for further research in the field of spectra exploitation - Contains helpful practical applications of this quick, simple, and inexpensive technique

Download or read book Spectrophotom trie U V visible avanc e pour l analyse en continu d l ments m talliques dans les eaux written by Bruno Coulomb and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'evolution constante des normes de qualite de l'eau et les nouvelles pratiques industrielles impliquent le developpement de procedures simples et rapides, adaptees aux techniques d'analyse en continu. Les metaux presentent, parmi les nombreux polluants rejetes dans le milieu naturel, un risque sanitaire important et leur concentration doit etre controlee frequemment dans les eaux naturelles et les effluents, sur site, afin de permettre une prise de decision rapide en cas de pollution accidentelle. Cependant, les methodes usuelles pour l'analyse des metaux sont couteuses et complexes, et ne permettent pas leur determination sur site. L'objectif de cette etude est donc de developper une procedure analytique simple et rapide pour l'analyse de 6 metaux (cu, fe, hg, ni, pb, zn) dans les eaux, adaptable a un analyseur en continu, par l'utilisation d'une separation complexometrique couplee a une detection u.v. Visible robuste, apres une etape rapide de photo-oxydation des echantillons. Dans un premier temps, differents reactifs ont ete elabores pour etre specifiques aux elements metalliques etudies. Pour chaque reactif, chaque complexe metallique forme presente une absorptivite differente des autres complexes et des ligands sous forme libre, permettant ainsi la differenciation des differents complexes metalliques et la quantification des metaux etudies par l'utilisation d'un calcul de deconvolution spectrale, realise sur des fenetres de longueurs d'onde dependant des metaux etudies et des reactifs utilises. La procedure proposee montre des resultats satisfaisants en comparaison avec la methode de reference d'analyse des metaux, et permet la determination quasi-simultanee de 6 metaux dans les eaux naturelles et les effluents industriels.

Download or read book UV visible Spectrophotometry of Water and Wastewater written by Olivier Thomas and published by Elsevier. This book was released on 2007-04-13 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: UV-Visible Spectrophotometry of Water and Wastewater is the first book dedicated to the use of UV spectrophotometry for water and wastewater quality monitoring. Using practical examples the reader is shown how this technique can be a source of new methods of characterization and measurement. Easy and fast to run, this simple and robust analytical technique must be considered as one of the best ways to obtain a quantitative estimation of specific or aggregate parameters (eg. Nitrate, TOC), and simultaneously qualitative information on the global composition of water and its variation.* First electronic library of UV-spectra providing data readily available for researchers and users* Provides a theoretical basis for further research in the field of spectra exploitation* Contains helpful practical applications

Download or read book Complexation Reactions in Aquatic Systems written by Jacques Buffle and published by Ellis Horwood. This book was released on 1988 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Basic Concepts of Environmental Chemistry written by Des W. Connell and published by CRC Press. This book was released on 2005-07-14 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basic Concepts of Environmental Chemistry, Second Edition provides a theoretical basis for the behavior and biological effects of natural chemical entities and contaminants in natural systems, concluding with a practical focus on risk assessment and the environmental management of chemicals. The text uses molecular properties such as pola

Download or read book Photometric Determination of Traces of Metals Part 2A written by Hiroshi Onishi and published by Wiley-Interscience. This book was released on 1986-04-03 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book treats procedures for the determination of aluminium through lithium. Strontium, a section included in calcium in the third edition, will be a separate chapter in the 4th edition. An effort has been made to keep to the aim of the previous editions of presenting a limited number of useful methods. Revision of magnesium through zirconium will require another several years.