Chelatometric Titration

Chelatometric titration is a type of compleximetric titration that utilizes the formation of complexes and is widely used as an analytical method to quantify materials, mainly metal ions, using a chelating agent.​

EDTA (ethylenediaminetetraacetic acid) is commonly used as a chelating agent, but since EDTA is sparingly soluble in water, its disodium salt (disodium dihydrogen ethylenediaminetetraacetate: 2NA) is often used.​

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Examples of metal indicator​

Indicator​ Preparation method Titratable metals Color change after direct titration
Eriochrome Black T (BT)​ Dissolve 0.5 g in 100 mL of methanol with 4.5 g of hydroxylamine hydrochloride.​ Mg,Ca,Zn,Cd.Hg(II),Mn(II),Pb,In Red chage to Blue
Murexide (MX)​ Mix 0.2 to 0.4 g with 100 g of NaCl or K2SO4 to prepare a diluted powder. Put in a brown bottle and seal for storage.​ Ca,Co,Ni,Cu Red or Yellow change to Purple
​1- (2-Pyridylazo) -2-naphthol (PAN) ​0.1% Ethanol Solution Zn,Cd,Cu,In Reddish purple change to Yellow
4- (2-Thiazolylazo)resorcinol (TAR)​ 0.1% Ethanol Solution​ Cu Reddish purple change to Yellow
​Pyrocatechol Violet (PV) ​0.1% Aqueous solution Bi,Th,Cu,Ni,Mn(II),Co,Zn,Cd,Pb,Mg Blue change to Purple or Yellow
​Xylenol Orange (XO) ​0.1% Aqueous solution Bi,Cd,Hg(II),Pb,Zn,Th etc. Reddish purple change to Yellow

For research use or further manufacturing use only. Not for use in diagnostic procedures.

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