Abstract：In Walpole buffer solution at pH 4.5 and in the presence of anionic surfactant of sodium dodecyl benzene sulfonate(SDBS), iron could form adsorption complex with carboxymethyl chitosan via coordination reaction, enhancing the resonance scattering signal of this system. Moreover, there were two significant resonance scattering peaks at 282 nm and 368 nm. Accordingly, an analysis method of iron content by resonance scattering method was established. 0.80 mL of 1.0 mg/mL CMCS solution, proper amount of 2.5 μg/mL iron standard solution, 1.0 mL of 10×10-4 mol/L SDBS solution and 1.2 mL of Walpole buffer solution at pH 4.5 were added successively into colorimetric tube and diluted to 5 mL. After reaction at room temperature for 14 min, the resonance scattering signals of sample solution (I) and blank solution (I0) were determined at maximum scattering peak of 282 nm in 1 cm quartz cuvette. The results indicated that the mass concentration of iron in range of 0.050-1.0 μg/mL showed good linear relationship to the enhanced resonance scattering intensity of system. The proposed method was applied to the determination of iron content in bag dust and ore slag. The relative standard deviation (RSD, n=5) were 2.7% and 3.1%, respectively. The recoveries were 96% and 108%, respectively.
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