Arsenazo III

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2,2′‐(1,8‐dihydroxy‐3,6‐disulfonaphthalene‐2,7‐bisazo)bisbenzenearsonic acid; an indicator substance used in the determination of low (micromolar) concentrations of free calcium ions. The free acid is purple; the calcium adduct is blue‐violet.

Subjects: Chemistry.

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