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      • Chemistry; Chem Sci/Eng
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          • Term
            • chelating agent
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          • Definition(s)
            • These are negatively charged or oxygen containing molecules that react with positively charged metal ions to form a stable complex. They have multiple locations in the molecule to react with multiple positive charges that may be present on multivalent metal ions that have more than one positive charge on them. An example of a chelating agent is EDTA, ethylene diamine tetraacetic acid. EDTA has four acetic acid groups giving it a potential for four negatively charged acetates to bond with up to four positively charged sites on metal ions with multiple positive charges, such as calcium which has two (2) positive charges associated with it. Alconox, Inc.
          • Example sentence(s)
            • EDTA is a versatile chelating agent. It can form four or six bonds with a metal ion, and it forms chelates with both transition-metal ions and main-group ions. EDTA is frequently used in soaps and detergents, because it forms a complexes with calcium and magnesium ions. - University of Wisconsin by
            • HIDS shows superior performance as a chelating agent; high thermal stability, high solubility in concentrated alkaline solutions and low corrosion. - NIPPON SHOKUBAI CO. by
            • The extraction parameters were the type and concentration of chelating agent and the duration of extraction time. All the extractions that involved chelating agents were carried out at pH 7.0. The heavy metal extraction efficiencies of chelating agents were compared to those of HNO3, CaCl2, and deionized water. - ASCE by
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    • German
      • Chemistry; Chem Sci/Eng
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          • Term
            • Chelatbildner (Komplexbildner)
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          • Definition(s)
            • Chelatbildner (griechisch chele "Krebsschere"), auch Chelatoren und Komplexbildner genannt, sind Stoffe, die als mehrzähnige Liganden mit ihren zwei oder mehr Bindungsstellen ein Koordinationszentrum (Zentralatom, Metallion) komplexieren, wodurch ein oder mehrere Ringe geschlossen werden. Die gebildeten Komplexe sind besonders stabil. Chemgapedia - by Andrea Winzer
          • Example sentence(s)
            • Ethylendiamintetraessigsäure bzw. Ethylendiamintetraacetat, das Tetraanion der Ethylendiamintetraessigsäure, kurz EDTA, ist ein Komplexbildner. Er bildet besonders stabile 1:1-Chelatkomplexe mit Kationen mit einer Ladungszahl von mindestens +2. - Wikipedia by Andrea Winzer
            • Chelatbildner können bei Vergiftungen mit Schwermetallen die Ausscheidung des Metalls aus dem Körper beschleunigen. Bei einer Vergiftung mit Blei, Quecksilber oder Kupfer kann der Chelatbildner D-Penicillinamin z. B. entweder eingenommen oder in eine Vene gespritzt werden, so dass die entsprechenden Metalle mit dem Urin ausgeschieden werden können. - wissen.de by Andrea Winzer
            • Laut IBCMT (International Board of Clinical Metal Toxicology) können nur Chelatbildner Schwermetalle ausleiten. Homöopathika, Phytotherapeutika, energetische Therapieformen, Algen, Fußpflaster, chinesische Kräuter, usw. können nachweislich keine Schwermetalle entgiften. Im Gegenteil: gerade Algen und chinesische Kräuter sind leider oft Schadstoffbelastet und führen dem Körper Schwermetalle zu. Zu den bisher bekannten Chelatbildner gehören u.a.: Vitamin C; Selen; Zink; DMPS; Zink-Trinatrium-Pentetat (ZnDTPA); Ditripentat (CaDTPA); Dimercapto-Bernsteinsäure (DMSA); D-Penicilinamine; NaEDTA; CaEDTA. Allerdings kann nicht jeder Chelatbildner jedes Metall binden und ausleiten sondern nur selektiv wirken. Deshalb steht vor der Behandlung immer erst die Diagnostik und Bestimmung der Schwermetallintoxikation anhand von Urin-, Blutuntersuchung und/oder Haarmineralanalyse. - Praxis Naturheilmedizin by Andrea Winzer
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    • Hungarian
      • Chemistry; Chem Sci/Eng
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          • Term
            • kelátképző (anyag, reagens)
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            • A kelátok fogalmát mintegy húsz évvel a komplexvegyületek felfedezése után határozták meg. A kelátligandumok olyan több donoratommal rendelkező több fogú ligandumok, melyek ugyanazon központi atomhoz két vagy több kötést alakítanak ki heterociklust alkotva. Az ilyen heterociklust kelátgyűrűnek nevezik, míg a heterociklust generáló iont pedig a kelátképző reagensnek. Wikipedia - by Attila Piróth
          • Example sentence(s)
            • (1) A 2003/2003/EK rendelet I. mellékletének E. szakasza jegyzékbe veszi azokat a mikroelemeket tartalmazó szervetlen műtrágyákat, amelyek az említett rendelet 3. cikkével összhangban elnyerhetik az "EK-műtrágya" elnevezést. A jegyzék több olyan műtrágyát is tartalmaz, amelyekben a mikroelem kémiailag kötődik egy kelátképző reagenshez. Az engedélyezett kelátképző reagensek jegyzékét az említett melléklet E.3.1. táblázata ismerteti. - Eur-Lex by Attila Piróth
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    • Portuguese
      • Chemistry; Chem Sci/Eng
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          • Term
            • agente quelante
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            • No tratamento de envenenamentos metálicos por Pb (chumbo), Hg (mercúrio) ou outros elementos, agentes quelantes são administrados para “seqüestrar” os íons metálicos, formando quelatos que possibilitam sua eliminação pelo organismo. Este tipo de tratamento para eliminação de metais tóxicos é às vezes denominado quelação. wikipedia - by txlouro
          • Example sentence(s)
            • EDTA (Ethylenediamine tetraacetic acid, ou ácido etilenodiamino tetra-acético) é um composto orgânico que age como agente quelante, formando complexos muito estáveis com diversos íons metálicos. Entre eles estão magnésio e cálcio, em valores de pH acima de 7 e manganês, ferro(II), ferro(III), zinco, cobalto, cobre(II), chumbo e níquel em valors de pH abaixo de 7. - Wikipedia by txlouro
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    • Bulgarian
      • Chemistry; Chem Sci/Eng
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          • Term
            • хелатен агент
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            • Вещество, чиято молекула може да свързва в комплекс метален йон чрез два или повече свои комплксообразуващи центрове (лиганди). Own research - by tinfire
          • Example sentence(s)
            • Органичните микроминерали са химически свързани с хелатни агенти или лиганди под формата на смес с аминокиселини или с пептиди. Хелатното свързване съществува при много от микроминералите, срещани в природата. - company site by tinfire
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