15 Chromogen/Metal Indicator



Metal Indicator

  • Product code
    P002  PAN
  • CAS No.
  • Chemical name
  • MW
Unit size Price Item Code
1 g $95.00 P002-10

1 g
Quantity may be adjusted within the cart.

Product Description

PAN is a metal indicator and colorimetric reagent for heavy metal and rare earth metal ions. This reagent is slightly soluble in acidic solutions and soluble in alkaline solutions. Its proton dissociation constants are reported to be pKa1=2.9 and pKa2=11.6 (μ=0.1, NaClO4, at room temperature). The aqueous solution is yellow at pH<12 and red at pH>12. The distribution constants, logKD, of chloroform/water and carbon tetrachloride/water are reported to be 5.4 and 4.0, respectively.

Chemical Structure

Technical info

Table 1 Characteristics of PAN Metal Complex

* M=metal ion, L=PAN


Table 2 Photometric Detection Conditions Using PAN


Open References

1. S. Shibata, Solvent Extraction Behavior of Some Metal-1-(2-Pyridylazo)-2-naphthol Chelates. Anal Chim Acta. 1960;23:367-369.

Handling and storage condition

Appearance: Yellowish orange to reddish orange powder or crystalline powder
Solubility in Methyl alcohol: To pass test (clear, yellowish orange)
Absorbance: ≧ 0.600 (around 470 nm)
m.p.: 138 - 145℃
Sulfated ash: ≦ 1.00 %
Sensitivity: To pass test
IR spectrum: Authentic
Handling and storage condition
Ambient temperature

Product Classification

Product Classification

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