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The optimal conditions of the Cd(Ⅱ)-Cadion 2B-Tween 40 system have been studied.In the alkaline medium of NaOH,a red Cd(Ⅱ)-Cadion 2B-Tween 40 complex forms with e510nm=9.80×104 The Ka ofCadion 2B and Surface tension in the system was estimated.It was proved that K was increased and the reagent species with absorption maximum at 605nm formed.Using the dual-wave length method at 510?605nm the apparent molar absorptivity for cadmium measured was 2.60×10 The molar ratio of cadmium to Cadion 2B is estimated to be 1:3 as estimated by the molar ratio method and continuous variation method.The Beer’s law is obeyed in 0~6μg Cd/25ml.Using the proposed method with TEA,IDA and CIT masking mixture,the Cd content in rice samples was determined with satisfactory results.
The optimal conditions of the Cd (Ⅱ) -Cadion 2B-Tween 40 system have been studied. In the alkaline medium of NaOH, a red Cd (Ⅱ) -Cadion 2B-Tween 40 complex forms with e510nm = 9.80 × 104 The Ka ofCadion 2B and Surface tension in the system was estimated. It was demonstrated that K was increased and the reagent species with absorption maximum at 605 nm formed. Using the dual-wave length method at 510 ~ 605 nm the apparent molar absorptivity for cadmium measured was 2.60 × 10 The molar ratio of cadmium to Cadion 2B is estimated to be 1: 3 as estimated by the molar ratio method and continuous variation method. The Beer’s law is obeyed in 0-6 μg Cd / 25 ml. Using the proposed method with TEA, IDA and CIT masking mixture, the Cd content in rice samples was determined with satisfactory results.