Beiraghi Asadollah, Zarei Ali Reza, Babaee Saeed
Faculty of Chemistry, Tarbiat Moallem University, Iran.
Anal Sci. 2007 May;23(5):527-31. doi: 10.2116/analsci.23.527.
A cloud-point extraction process using a mixed micelle of the cationic surfactant cetyl pyridinium chloride (CPC) and non-ionic surfactant Triton X-114 to extract beryllium from aqueous solutions was investigated. The method is based on the color reaction of beryllium with Chrome Azurol S (CAS) in acetate buffer and the mixed micelle-mediated extraction of the complex. This complex was concentrated in a surfactant-rich phase after separation. The optimal extraction and reaction conditions (e.g. pH, reagent and surfactant concentrations, temperature, incubation and centrifuge times) were evaluated and optimized. Under the optimized conditions, the analytical characteristics of the method (e.g. limit of detection, linear range and preconcentration factor) were obtained. Linearity was obeyed in the range of 0.30 - 18 ng mL(-1) of beryllium and the detection limit of the method was 0.05 ng mL(-1). The interference effect of some cations and anions was also studied. The proposed method was successfully applied to the determination of beryllium in real water samples.
研究了一种浊点萃取方法，该方法使用阳离子表面活性剂十六烷基氯化吡啶（CPC）和非离子表面活性剂Triton X - 114的混合胶束从水溶液中萃取铍。该方法基于铍与铬天青S（CAS）在乙酸盐缓冲液中的显色反应以及混合胶束介导的配合物萃取。分离后，该配合物富集在富含表面活性剂的相中。评估并优化了最佳萃取和反应条件（例如pH值、试剂和表面活性剂浓度、温度、孵育和离心时间）。在优化条件下，获得了该方法的分析特性（例如检测限、线性范围和预富集因子）。铍浓度在0.30 - 18 ng mL⁻¹范围内符合线性关系，该方法的检测限为0.05 ng mL⁻¹。还研究了一些阳离子和阴离子的干扰效应。所提出的方法成功应用于实际水样中铍的测定。
