Ethylenediaminetetracetic acid

In a complexation reaction, the reaction unit is an electron pair. For the metal, the number of reaction units is the number of coordination sites available for binding ligands. For the ligand, the number of reaction units is equivalent to the number of electron pairs that can be donated to the metal. One of the most important analytical complexation reactions is that between the ligand ethylenediaminetetracetic acid (EDTA), which can donate 6 electron pairs and 6 coordinate metal ions, such as Cu thus... 

Ligno sulfonate—metal complexes are weaker complexes than those formed from amine-based complexing agents such as ethylenediaminetetracetic acid (EDTA). They are compatible with most pesticides /herbicides, but thek use in phosphate fertilisers is not recommended. 

Some strains of P. aeruginosa are resistant to benzalkonium chloride and, in fact, can be grown in solutions concentrated in this agent. This has caused great concern because of the virulent nature of this organism in ocular infections, as discussed previously. Thus, it was an important finding in 1958 that the acquired resistance could be eliminated by the presence of ethylenediaminetetracetic acid (sodium edetate) in the formulation. This action of EDTA has been correlated with its ability to chelate divalent cations, and it is commonly used as a preservative aid [125]. The use of disodium EDTA, where compatible, is recommended in concentrations up to 0.1%. 

Aggett, J. and L.S. Roberts. 1986. Insight into the mechanism of accumulation of arsenate and phosphate in hydro lake sediments by measuring the rate of dissolution with ethylenediaminetetracetic acid. Environ. Sci. Technol. 20 183-186. 

Ethylenediaminetetracetic acid disodium salt TRIS Tris(hydroxy)aminomethane HMTA Hexamethylenetetramine... 

Alternative strategies have also been proposed, in which the metal components are removed from the wood prior to incineration. These include extraction using phosphoric acid (Kazi and Cooper, 2002), ethylenediaminetetracetic acid (Nami Kartal, 2003) or oxalic acid combined with bacterial culture (Clausen, 2004a,b), and electrodialysis (Mateus etal., 2002). 

In the first step, a substrate coordinates to a metal catalyst and forms an intermediate mixed complex (LMS in Scheme 13). The substrate is then activated by metal ions and dissociates from the catalyst. The complex catalyst, having accomplished its purpose, is regenerated to the original complex. The catalytic action of a metal ion depends substantially on the nature of the ligands in the intermediate mixed complex. Certain ligands induce an increase in catalytic activity, while others, e.g. multidentate ligands such as ethylenediaminetetracetic acid, inhibit the catalytic action of a metal ion. Therefore, if a polymer ligand is used as one component of a metal-complex catalyst, its properties may affect the catalytic action of the metal ion. 

Why is it advisable to add ethylenediaminetetracetic acid (EDTA) to measure calcium when it is in the form of a phosphate ... 

Among the numerous commercial derivatives of ethylenediaminetetracetic acid (EDTA), a mixed salt of Zn, Na containing one atom of zinc and two atoms of sodium per molecule of EDTA is found. This mixed salt presents itself in the form of a crystallised hydrate. An attempt is described to deduce the number of water molecules of this hydrate by measuring the presence of zinc by atomic absorption. The experimental approach was as follows ... 

MEDTA. Dissolve 7.4 g ethylenediaminetetracetic acid (disodium salt) in 100 mL distilled water Raise the pH to 8 0, and autoclave. 

Ethylenediaminetetracetic acid, C10H16N2O8 (Sigma-Aldrich Corp.)... 

Bulk Ethylenediaminetetracetic acid HPLC Silica, 10 m, 30 cm 4 mm MeOH(l%NH OH)-CH.CI, (2 8) 254 nm GC described, also TLC (267) /V-ethylamphetam ine. N, V-dimethyl-amphetamine (also known as N, /V,alpha-trimethylbenzeneethana mine A,A/,alpha-trimethylphenethyl-amine) [10]... 

Ethylenediaminetetracetic acid (EDTA), usually as the di-sodium salt, is added to a concentration of 1 mM to chelate heavy metal ions, which can inhibit enzymes at very low concentrations, and also to remove Ca2+ and Mg2+, which can otherwise act... 

Compound D is EDTA (EthyleneDiamineTetracetic Acid - an important metal chelator). This time there are three types of carbon atom - two of type a and four each of b and c. 

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