15 Chromogen/Metal Indicator



Metal Indicator

  • Product code
    T003  TPPS
  • CAS No.
  • Chemical name
    5,10,15,20-Tetraphenyl-21H,23H-porphinetetrasulfonic acid, disulfuric acid, tetrahydrate
  • MW
Unit size Price Item Code
100 mg T003-10

Product Description

TPPS is a water-soluble porphyrin that is reddish-purple in aqueous solution at pH 6.5 (maximum wavelength: 413 nm, molar absorptivity: 5.1×105) and green at pH 4 (maximum wavelength: 434 nm, molar absorptivity: 5.0×105). Its proton dissociation constants are reported to be pKa1=4.86 and pKa2=4.96. TPPS selectively forms a complex with Cu2+ in acidic conditions, and with Cd, Cu, Fe, Pb, and Pd in alkaline conditions.

Technical info

Table 1 Colorimetric Detection Conditions Using TPPS


Open References

1. A. D. Adler, et al., A Simplified Synthesis for Meso-tetraphenylporphin. J Org Chem. 1967;32:476-476.
2. J. Itoh, et al., Spectrophotometric Determinaton of Copper with α, β, γ, δ-Tetraphenylporphine Trisulfonate. Anal Chim Acta. 1975;74:53-60.

Handling and storage condition

Appearance: Deep green to deep greenish blue powder
Solubility in water: To pass test (clear, deep green)
Molar absorptivity (pH6.5): ≧ 510,000 (around 413 nm)
Molar absorptivity (pH3.0): ≧ 472,000 (around 434 nm)
Water content: 3.0 - 8.5 %
IR spectrum: Authentic
Handling and storage condition
Ambient temperature

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