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Spectrophotometric Determination of Trace Iron (Ⅱ) with-5-Br-PADAP in the Presence of CTMAB

GUO Hang Ming YE Su Fang (Medical College,Jinhua Professional Technical College,Jinhua,Zhejiang 321000,P.R.China)  
Color reaction of iron(Ⅱ) with 2 (5 bromo 2 pyridylazo) 5 diethylaminophenol(5 Br PADAP) has been studied in the presence of cationic surfactant CTMAB.Iron(Ⅱ) reacts with 5 Br PADAP at pH 3.6—6.4 to form a stable 1∶3 complex in aqueous solution.The apparent molar absorptivity of the complex is 3.1×10 4L·mol -1 ·cm -1 (at 749nm).Beer's law is obeyed in the range of 0? ?0μg/25mL for iron(at 749nm).The proposed method has been applied to the determination of trace iron in water with satisfactory results.
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