Hacettepe University, Chemistry Department, 06800, Beytepe, Ankara, Turkey.
J Hazard Mater. 2010 Apr 15;176(1-3):672-7. doi: 10.1016/j.jhazmat.2009.11.084. Epub 2009 Dec 8.
A simple, rapid, inexpensive, and nonpolluting cloud point extraction (CPE) technique has been improved for the preconcentration and determination of nickel and manganese. After complexation with p-nitrophenylazoresorcinol (Magneson I), the analytes could be competitively extracted in a surfactant octylphenoxy polyethoxyethanol (Triton X-114), prior to determination by flame atomic absorption spectrometry (FAAS). The effects of experimental conditions such as pH, concentration of chelating agent and surfactant, equilibration temperature and time on CPE were studied. Under the optimum conditions, preconcentration of a 25 mL sample solution permitted the detection of 2.7 ng mL(-1) Ni(2+) and 2.9 ng mL(-1) Mn(2+) with enrichment factors of 17 and 19 for Ni(2+) and Mn(2+), respectively. The developed method was applied to the determination of trace nickel and manganese in water and food samples with satisfactory results.
一种简单、快速、廉价且无污染的浊点萃取（CPE）技术已得到改进，用于镍和锰的预浓缩和测定。在与对硝基苯偶氮间苯二酚（Magneson I）络合后，分析物可以在表面活性剂辛基酚聚氧乙烯聚氧丙烯乙醇（Triton X-114）中进行竞争萃取，然后通过火焰原子吸收光谱法（FAAS）进行测定。研究了实验条件如 pH 值、螯合剂和表面活性剂浓度、平衡温度和时间对 CPE 的影响。在最佳条件下，对 25 mL 样品溶液进行预浓缩，可检测到 2.7 ng mL(-1) 的 Ni(2+)和 2.9 ng mL(-1) 的 Mn(2+)，Ni(2+)和 Mn(2+)的富集因子分别为 17 和 19。该方法已应用于水样和食品样中痕量镍和锰的测定，结果令人满意。
