Method for detecting trace iron in power plant water vapor

The invention provides a method for detecting trace iron in power plant water vapor, which comprises the following steps of: (1) making a standard working curve by taking absorbance as a vertical coordinate and Fe concentration as a horizontal coordinate; (2) treating the power plant water sample to be detected by using a hydrochloric acid digestion method or a thioglycolic acid digestion method; and (3) sequentially adding an acetic acid-ammonium acetate buffer solution and a color developing agent TPTZ aqueous solution into the water sample obtained after treatment in the step (2), determining the absorbance of the water sample, and calculating the concentration of trace iron in the power plant water vapor according to the standard curve. The detection limit of the method provided by the invention is less than 5.0 mu g/L, and the method is suitable for laboratory detection and analysis of trace iron in water vapor of a high-parameter high-capacity unit. 本发明提供了一种电厂水汽中痕量铁的检测方法，所述电厂水汽中痕量铁的检测方法包括：(1)以吸光度为纵