Abstract：The fading reaction of rhodamine B and methylene blue oxidized by hydrogen peroxide could be catalyzed by trace iron(Ⅲ) in HNO3 medium. The absorbance change of catalytic system and non-catalytic system was measured at 555 nm and 663 nm, respectively. The concentration of iron(Ⅲ) showed good linearity to the sum of the absorbance difference at two wavelengths. Thus, a new determination method of trace iron(Ⅲ) by catalytic kinetic spectrophotometry was established with dual-wavelength and dual-indicator. The results showed that the linear regression equation was ΔA＝0.064 85 ρFe3+ (μg/L)+0.439 6 with correlation coefficient of r=0.998 3. The linear range of method was 2.0-20.0 μg/L. The detection limit was 0.185 μg/L. The proposed method was applied to the determination of trace iron(Ⅲ) in rain water, river water and tap water. The results were consistent with those obtained by atomic absorption spectrometry (AAS). The relative standard deviations (RSD, n=6) were between 0.38% and 0.53%. The recoveries were between 99% and 102%.
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