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- Chemistry; Chem Sci/Eng
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- 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.
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- 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
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- Chemistry; Chem Sci/Eng
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- 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
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- (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 - Related KudoZ question
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- Chemistry; Chem Sci/Eng
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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
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- 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 - Related KudoZ question
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- Chemistry; Chem Sci/Eng
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- Chelatie is een proces en een vorm van chemische binding die niet echt een chemische binding is.
Sommige organische moleculen hebben twee of meer, vaak vier, uitstekende, flexibele 'armen' met sterk elektronegatieve groepen aan het uiteinde. Hiermee kunnen ze zich om diverse metaalionen heen groeperen, die dan door de gecombineerde aantrekkingskracht van de elektronegatieve groepen wordt vastgehouden. De anders vaak slecht oplosbare metaalionen kunnen hiermee soms goed in oplossing gaan.
Dit principe vindt op vele manieren toepassing in de industrie (b.v. EDTA wordt gebruikt om calciumionen in hard water te binden voor wasmiddelen en waterontharders). Wikipedia - by Michiel Leeuwenburgh
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- Picolinezuur komt in het menselijk lichaam voor; het is een van de omzettingsproducten van tryptofaan. Het fungeert in het lichaam als chelatiemiddel voor mineralen en sporenelementen als zink, mangaan, koper en chroom en vergemakkelijkt het transport van deze mineralen. - Wikipedia
by Michiel Leeuwenburgh - Appelzuur functioneert als chelatiemiddel waardoor een te hoog niveau aan aluminium uit het lichaam kan worden verwijderd. - Pilliewillie
by Michiel Leeuwenburgh - Het chelatiemiddel EDTA dient men toe door middel van een infuus: een dunne naald in de ader. Het middel lost verkalking op in de bloedvaten. - Fitplein
by Michiel Leeuwenburgh - Related KudoZ question
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