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NIOSH French/WHO/International Program on Chemical Safety/Intern. IPCS INCHEM. The Risk Assessment Information System. Sécurité et santé au travail : INRS. SIRI MSDS Index. ITER. ITER is a free Internet database of human health risk values and cancer classifications for over 680 chemicals of environmental concern from multiple organizations worldwide.


ITER is the only database that presents risk data in a tabular format for easy comparison, along with a synopsis explaining differences in data and a link to each organization for more information. Search Original ITER Search ITER on TOXNET ITER is currently available at its "Original ITER" location ( and is also available as part of the TOXNET compilation of databases ( The two locations contain the same information, however, the TOXNET display allows for additional search functions (click here to read a published manuscript describing how to use ITER on TOXNET). Edits to ITER are still made to the "Original ITER" location, which is uploaded to the TOXNET version of ITER on a weekly basis. The Risk Information Exchange (RiskIE) is a companion database to ITER. Page d'accueil. NIOSH redirector /niosh/npg/npgd0000.html. Skip directly to local search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options CDC Home CDC 24/7: Saving Lives.

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Protecting People.™ <div class="noscript"> Note: Javascript is disabled or is not supported by your browser. NIOSH HomeNIOSH Pocket Guide to Chemical Hazards NIOSH Pocket Guide to Chemical Hazards NIOSH Homepage Facebook Reccomend Twitter Tweet. Institut National de l'Environnement Industriel et des Risques - TOXNET. Furetox, Moteur de recherche. TOXNET. Products & Services: CHEMINFO. Alert & Response Operations. Integrated Risk Information System (IRIS) Chemical Awareness. INCHEM SIDS. ATSDR HAP. ATSDR Home. INERIS - Institut National de l'Environnement Industriel et des. Chemical Reactivity Worksheet (CRW) The Chemical Reactivity Worksheet (CRW) is a free software program you can use to find out about the chemical reactivity of thousands of common hazardous chemicals.

Download the Chemical Reactivity Worksheet for Windows, Mac, or iPad. Reactivity is the tendency of substances to undergo chemical change, which can result in hazards—such as heat generation or toxic gas byproducts. The CRW predicts possible hazards from mixing chemicals and is designed to be used by emergency responders and planners, as well as the chemical industry, to help prevent dangerous chemical incidents.

The chemical datasheets in the CRW database contain information about the intrinsic hazards of each chemical and about whether a chemical reacts with air, water, or other materials. It also includes case histories on specific chemical incidents, with references. The Compatibility Chart shows the predicted hazards of mixing the chemicals in a mixture in an easy-to-use graphical interface. National Toxicology Program. Chélation. Un article de Wikipédia, l'encyclopédie libre.


Complexe chélate de l'EDTA avec un cation métallique Le « chélate » se distingue du simple « complexe » par le fait que le cation métallique est fixé au chélateur par au moins deux liaisons de coordination définissant un cycle avec le métal, à la manière d'une pince, d'où le nom. Le nombre de liaisons métal-ligand qu'il est possible de former définit la « denticité » : on parle de coordinats bidentes, tridentes, tétradentes, etc, ainsi que de ligands monodentates, bidentates, polydentates.

L’atome central est lié aux atomes voisins par au moins deux liaisons en formant une structure annulaire, un cycle chélate. Les cycles chélates les plus stables sont les cycles chélates à 5 et à 6 chaînons. Des chélateurs sont utilisés comme médicaments (en cas de saturnisme par exemple), mais doivent être utilisés avec précaution car pouvant interférer avec d'autres métaux que le métal cible, et pouvant interférer avec l'immunité[1].