Kazi Tasneem G, Shah Faheem, Afridi Hassan I, Baig Jameel Ahmed, Soomro Abdul Sattar
University of Sindh, National Centre of Excellence in Analytical Chemistry, Jamshoro, Pakistan.
J AOAC Int. 2013 Mar-Apr;96(2):447-52. doi: 10.5740/jaoacint.11-128.
A simple method for the preconcentration of cadmium (Cd) and nickel (Ni) in drinking and wastewater samples was developed. Cloud point extraction has been used for the preconcentration of both metals, after formation of complexes with 8-hydroxyquinoline (8-HQ) and extraction with the surfactant octylphenoxypolyethoxyethanol (Triton X-114). Dilution of the surfactant-rich phase with acidified ethanol was performed after phase separation, and the Cd and Ni contents were measured by flame atomic absorption spectrometry. The experimental variables, such as pH, amounts of reagents (8-HQ and Triton X-114), temperature, incubation time, and sample volume, were optimized. After optimization of the complexation and extraction conditions, enhancement factors of 80 and 61, with LOD values of 0.22 and 0.52 microg/L, were obtained for Cd and Ni, respectively. The proposed method was applied satisfactorily for the determination of both elements in drinking and wastewater samples.
开发了一种用于饮用水和废水样品中镉（Cd）和镍（Ni）预富集的简单方法。浊点萃取法已用于这两种金属的预富集，先使其与8-羟基喹啉（8-HQ）形成络合物，然后用表面活性剂辛基苯氧基聚乙氧基乙醇（Triton X-114）进行萃取。相分离后，用酸化乙醇稀释富含表面活性剂的相，并用火焰原子吸收光谱法测定Cd和Ni的含量。对pH值、试剂（8-HQ和Triton X-114）用量、温度、孵育时间和样品体积等实验变量进行了优化。在络合和萃取条件优化后，Cd和Ni的富集因子分别为80和61，检测限分别为0.22和0.52μg/L。该方法成功应用于饮用水和废水样品中两种元素的测定。
