Studies on the Catalytic Spectrofluorimetric Method for Ultratrace Ir

In 0.1mol/L H₂SO₄ medium at 80℃,Ir(Ⅳ) catalyses strongly the KIO₄ oxidation of rhodamine B to form a green fluorescence product(λ_ex/λ_em=245nm/535nm). The variable on catalytic spectrofluorimetric determination of Ir were investigated.A calibration graph from 0.01 to 2 ng/mL Ir and detection limit of 0.005ng/mL Ir were obtained by the fixed-time procedure.The catalytic mechanism was also discussed.