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Infobox references. Ethylenediaminetetraacetic acid (EDTA), also called EDTA acid, is an aminopolycarboxylic acid with the formula [CH 2 N (CH 2 CO 2 H) 2] 2. This white, slightly water-soluble solid is widely used to bind to iron (Fe 2+ /Fe 3+) and calcium ions (Ca 2+), forming water-soluble complexes even at neutral pH.
Tetrasodium EDTA is the salt resulting from the neutralization of ethylenediaminetetraacetic acid with four equivalents of sodium hydroxide (or an equivalent sodium base). It is a white solid that is highly soluble in water. Commercial samples are often hydrated, e.g. Na 4 EDTA. 4H 2 O. The properties of solutions produced from the anhydrous ...
Vacutainer. A vacutainer blood collection tube is a sterile glass or plastic test tube with a colored rubber stopper creating a vacuum seal inside of the tube, facilitating the drawing of a predetermined volume of liquid. Vacutainer tubes may contain additives designed to stabilize and preserve the specimen prior to analytical testing.
Hexadentate ligand. A hexadentate ligand in coordination chemistry is a ligand that combines with a central metal atom with six bonds. [1] One example of a hexadentate ligand that can form complexes with soft metal ions is TPEN. [1] A commercially important hexadentate ligand is EDTA. Generic structure of a metal complex of hexadentate EDTA.
Calconcarboxylic acid is used for the determination of calcium ion concentration by complexometric titration. Free calconcarboxylic acid is blue colour, but changes to pink/red when it forms a complex with calcium ions. EDTA forms a more stable complex with calcium than calconcarboxylic acid does, so addition of EDTA to the Ca ...
Instrument. Uses. Test tube. Folin-Wu tube. Glass slide mycole and cover slips. in microscopy, serology, etc. as the solid backing on which test samples are. Petri dish. used for preparation of culture media and the culture of organisms they are in. Glass beaker.
The form "EDTA" is often sold as are various salts of H 2 EDTA 2-, say Na 2 H 2 EDTA or CaH 2 EDTA or Na 4 EDTA. These are the salts one adds to sequester metal ions (often binding as HEDTA - ). Or maybe people intend the corresponding anions H 2 EDTA 2- or EDTA 4- (most Wiki-chem articles are on compounds, but some are on ions).
EDDHA or ethylenediamine-N,N′-bis (2-hydroxyphenylacetic acid) is a chelating agent. Like EDTA, it binds metal ions as a hexadentate ligand, using two amines, two phenolate centers, and two carboxylates as the six binding sites. The complexes are typically anionic. The ligand itself is a white, water-soluble powder.