Determination of trace iron by catalytic spectrophotometry with nile blue
Luo Chuannan,Zhou Changli,Wei Qin,Yan Yonghong Departmen of Applied Chemistry,Shandong Building Industry Institute,Jinan 250022, China
A new method is developed for the determination of trace iron, which is used to catalyze the discoloring reaction of KBrO3 oxidizing nile blue in acid medium in the presence of NTA. The kinetics is studied. The method has high sensitivity and the range of determination is 0～0.4μg/25mL for iron. The detection limit of the method is 4.73×10 -10g/mL. Satisfactory results are obtained for the determination of trace iron in food and water.
【CateGory Index】： O657.3