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中文摘要：
建立了萃取镉的乙醇-硫酸铵双水相体系。以火焰原子吸收光谱法（FAAS）为检测手段，研究了乙醇-硫酸铵双水相萃取镉的主要影响因素，并且利用FT—IR光谱，对其萃取机理进行了初步的探讨。实验结果表明，Cd^2＋与I^-、结晶紫在pH5．0～6．0的乙醇-硫酸铵双水相体系中形成稳定的紫色络合物，在最佳萃取条件下，镉能很好地与其他常见的金属离子分离，萃取率达到100％。该方法测定镉的线性范围为0～0．50μg／mL，相关线性系数为0．9993，方法检出限为0．012μg／mL。用于环境水样中镉量的测定，相对标准偏差为为2．8％～3．6%，加标回收率大于95％。
英文摘要：
The ethanol-ammonium sulfate two-phase extraction system for cadmium was developed. The main influencing factors for the extraction of cadmium by ethanol-ammonium sulfate two-phase system were investigated with flame atomic absorption spectrometry （FAAS）. Moreover, the extraction mechanism was preliminarily discussed by Fourier transform infrared spectrometry （FT-IR）. The results showed that Cd^2＋ could form stable purple complex with I and crystal violet in ethanol-ammonium sulfate two-phase system at pH 5.0--6.0. Under the optimal extraction conditions, cadmium could be well separated from other common metal ions. The extraction rate was up to 100 %. The linear range of calibration curve was 0--0.50 μg/mL, with the linear correlation coefficient of 0. 999 3 and the detection limit of 0. 012 μg/mL. The proposed method was applied to the determination of cadmium in environmental water samples. The relative standard deviations （RSD） were 2. 8 %- 3.6 % ,and the recoveries were higher than 95%.
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