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. 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]. Typologie des chélateurs[modifier | modifier le code] Il existe des chélatants faibles, qui forment des complexes labiles et instables, et des chélatants forts, tels l'EDTA, qui peuvent former des complexes extrêmement stables et inertes, caractérisés par des constantes de dissociation inférieures à 10-27, c'est-à-dire que la forme complexée est un milliard de milliard de milliard de fois plus stable que la forme dissociée.
NIOSH Pocket Guide to Chemical Hazards (NPG) The NIOSH Pocket Guide to Chemical Hazards is intended as a source of general industrial hygiene information on several hundred chemicals/classes for workers, employers, and occupational health professionals. The NIOSH Pocket Guide does not contain an analysis of all pertinent data, rather it presents key information and data in abbreviated or tabular form for chemicals or substance groupings (e.g. cyanides, fluorides, manganese compounds) that are found in the work environment. The information found in the NIOSH Pocket Guide should help users recognize and control occupational chemical hazards. Search the NIOSH Pocket Guide Enter search terms separated by spaces. Download the NIOSH Pocket Guide Download the NIOSH Pocket Guide CD-ROM as an ISO image file and create a disc with CD-ROM authoring software. Ordering Information To order free copies of the NIOSH Pocket Guide: Comments
MuMa Voxalead Chemical Reactivity Worksheet (CRW) | Planning for Environmental 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 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. You can also create your own custom chemical datasheets, as you might do, for instance, if your facility produces a proprietary chemical that is not in the CRW database. The CRW also includes a reactivity prediction worksheet that you use to virtually "mix" chemicals to simulate accidental chemical mixtures, such as in the case of a train derailment, to learn what dangers could arise from the accidental mixing.
TERA 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. 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 Share Compartir This Page Is No Longer Available has moved. Contact Us: National Institute for Occupational Safety and Health (NIOSH) Centers for Disease Control and Prevention 800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 New Hours of Operation 8am-8pm ET/Monday-Friday Closed Holidays Contact CDC-INFO File Formats Help: How do I view different file formats (PDF, DOC, PPT, MPEG) on this site? A-Z Index for All CDC Topics
Published OECD SIDS initial assessments of HPV chemicals Key Documents OECD Existing Chemicals Database eChemPortal Other Websites and Databases Data Ownership Key Documents When a chemical or chemical category has been agreed by OECD member countries, several final documents are available to the public: The OECD-generated profile (called either the Screening Information Dataset (SIDS) Initial Assessment Profile (SIAP) or the Initial Targeted Assessment Profile (ITAP)) contains brief summaries of SIDS endpoints as well as the major conclusions of the hazard assessment. See the Manual for the Assessment of Chemicals for information on the process of gathering information, testing and assessing chemicals and chemical categories in the Cooperative Chemicals Assessment Programme, offers additional search capabillities and contains several useful lists and reports for easy viewing. OECD Existing Chemicals Database eChemPortal Other Websites and Databases UNEP Chemicals European Commission Japan's Chemical Substances Control Law Data Ownership
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 Risk Information Exchange (RiskIE) is a companion database to ITER. RiskIE is a database of notifications about a variety of human health risk assessment projects that are underway or recently completed.
The Risk Assessment Information System