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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