ChemicalName: Purpuric acid, ammonium salt Appearance: Reddish or dark reddish purple powder
Absorbance (0.018 mmol/l): ≥0.200 (around 525 nm)
Sensitivity: To pass test
MW: 284.19, C8H8N6O6
Storage Condition: ambient temperature, protect from metal
Shipping Condition: ambient temperature
Product Description of Murexide and MX
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 be pKa1=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.
K. S. Balaji, et al., Anal. Chem., 50, 1972 (1978).