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Item # Unit Size
10 g

For Research Use Only Products

Application: Metal indicator

ChemicalName: Mixture of Cu-EDTA and PAN (11.1:1)

Appearance: Grayish red brown or yellowish brown powder
Absorbance: ≥0.500 (around 470 nm)

Storage Condition: ambient temperature, protect from metal
Shipping Condition: ambient temperature

Product Description
Cu-PAN, a mixture of Cu-EDTA and pyridylazo-naphthol PAN, is a very popular metal indicator for chelatometry. Usually, 20-50% aqueous dioxane (or isopropyl alcohol) or 50-70% aqueous methanol (or ethanol) is used as a solvent (1 g Cu-PAN per 100 ml solvent). The solution should be heated during the chelating titration.

Chelate titration (acidic condition): Al, C, Co, Fe(III), Ga, Hg, In, Ni, V, Zn, rare earth metal ions
Chelate titration (alkaline condition): Ca, Cu, Mg, Mn(II)
1) H. Flaschka, et al., EDTA Titrations Using Copper-PAN Complex as Indicator. Chem Anal. 1956;45:58-61.