Arsenazo III 

Arsenazo III is a dye useful for detection of micromolar concentrations of ionized Ca²⁺. Arsenazo III can be used for determination of thorium, zirconium, uranium and rare earth elements^[1][2].

776.37

C₂₂H₁₈As₂N₄O₁₄S₂

1668-00-4

Solid

Brown to black

560

530

O=S(C1=C(/N=N/C2=CC=CC=C2[As](O)(O)=O)C(O)=C3C(O)=C(/N=N/C4=CC=CC=C4[As](O)(O)=O)C(S(=O)(O)=O)=CC3=C1)(O)=O

Room temperature in continental US; may vary elsewhere.

4°C, protect from light

*In solvent : -80°C, 6 months; -20°C, 1 month (protect from light)

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (protect from light). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

• [1]. Arsenazo III is a dye useful fKendrick NC. Purification of arsenazo III, a Ca2+-sensitive dye. Anal Biochem. 1976 Dec;76(2):487-501.  [Content Brief]

  [2]. Savvin S B. Analytical use of arsenazo III: determination of thorium, zirconium, uranium and rare earth elements. Talanta, 1961, 8(9): 673-685.