15 Chromogen/Metal Indicator


Metal Indicator

  • Product code
    M012  MX
  • Chemical name
    Composite preparation of ammonium purpurate and potassium sulfate
Unit size Price Item Code
100 g M012-08

Product Description

MX is a 1:250 mixture of Murexide and potassium sulfate. Murexide is a metal indicator for Ca, Co, Cu, Ni, Th, and rare earth metals; it is also a colorimetric reagent for calcium and rare earth metals. Murexide is slightly soluble in water, alcohol, and ether. Murexide is unstable in aqueous solution. Its proton dissociation constants are reported to bepKa1=0, pKa2=9.2 and pKa3=10.5. The solution is yellow in strong acidic conditions, reddish-purple in weak acidic conditions, and bluepurple in alkaline conditions. Detection conditions for calcium are pH 11.3, maximum wavelength 506 nm and detection range 0.2-1.2 ppm.


Open References

K. S. Balaji, et al., Anal. Chem., 50, 1972 (1978).

Handling and storage condition

Appearance: Pink to reddish purple powder
Solubility in water: To pass test (clear, pale pink)
Sensitivity: To pass test
Handling and storage condition
Ambient temperature

Product Classification

Product Classification

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