Abstract：Cadmium could react with potassium iodide and acridine orange to form a ternary ionic association complex [AO]2[CdI4] in HAc-NaAc buffer solution at pH 3. The resonance light-scattering spectral intensity of the association complex could be greatly enhanced in presence of surfactant polyvinyl alcohol. The experimental results indicated that the resonance Rayleigh scattering (RRS) spectrum, the second-order scattering (SOS) spectrum and frequency-doubling scattering (FDS) spectrum of this system was located at 335 nm (RRS), 668 nm (SOS) and 338 nm (FDS), respectively. Under the optimized experimental conditions, the enhancement of spectral signal (ΔI) showed good linearity to the concentration of cadmium in certain range. The detection limit was 0.38 μg/L (RRS), 0.25 μg/L (SOS) and 0.36 μg/L (FDS), respectively. The established method was applied to the detection of Cd2+ in environmental water samples by the combination with sulfhydryl cotton separation technology. The recoveries were between 95.1% and 107.7%. The relative standard deviations (RSDs) were 0.6%-2.3%. In addition, the reasons for the resonance scattering enhancement of this system and the reaction mechanism were discussed.
何 妍,杨迎春,叶芝祥,王久琼. 镉-碘化钾-吖啶橙体系的共振光散射光谱及其应用[J]. 冶金分析, 2015, 35(5): 37-42.
HE Yan, YANG Ying-chun, YE Zhi-xiang,WANG Jiu-qiong. Resonance light-scattering spectrum of cadmium-potassium iodide-acridine orange system and its application. , 2015, 35(5): 37-42.
World Health Organization (WHO). Guidelines for Drinking Water Quality, Health Criteria and Other Supporting Information: Vol.2[M]. 2nd ed. Geneva:World Health Organization, 1998.
