Application: Heavy metal ions and rare earth metal ions detection

Chemical Name: Pyrogallol Red
CAS: 32638-88-3

dark reddish-brown or dark purple powder

Sensitivity: pass test
400.36, C19H12O8S

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

Product Description
PR is a colorimetric reagent and indicator for heavy metal ions and rare earth metals. This reagent is hardly soluble in water and alcohol, and insoluble in organic solvents. The color of PR in aqueous solution is orange-red in weak acidic pH, yellow in neutral pH, and violet in alkaline pH. The aqueous PR solution turns red in the presence of Bi or Pb at acidic pH, and blue-violet in the presence of Co, Ni, and rare earth metal ions at neutral or alkaline pH. Its proton dissociation constants are reported to be pKa1=2.56, pKa2=6.28, pKa3=9.75 and pKa4=11.94.

Chemical Structure

Chelate titration: Bi, Co, Ni, Pb, rare earth metals
Precipitation titration: Br-, Cl-, I-, SCN
Colorimetry: Ag, Al, Cu, Fe, Ge, In, Mo, Sb, Ti, U, V, W, rare earth metals

1. J. Medina-Escriche, et al., Spectrophotometric Study of the Cerium(IV) - Pyrogallol Red System. Analyst. 1985;110:807-810.
Item # Description/Size Availability Qty Break Price Quantity
1 g
8-14 business days 1 CALL

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