Liang Pei, Sang Hongbo, Sun Zhimei
Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
J Colloid Interface Sci. 2006 Dec 15;304(2):486-90. doi: 10.1016/j.jcis.2006.09.006. Epub 2006 Sep 9.
Cloud point extraction (CPE) was applied as a preconcentration step prior to graphite furnace atomic absorption spectrometry (GFAAS) determination of manganese(II) and iron(III) in water samples. After complexation with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP), the analytes could be quantitatively extracted to the phase rich in the surfactant p-octylpolyethyleneglycolphenylether (Triton X-100) and be concentrated, then determined by GFAAS. The parameters affecting the extraction efficiency, such as solution pH, concentration of PMBP and Triton X-100, equilibration temperature and time, were investigated in detail. Under the optimum conditions, preconcentration of 10 ml of sample solution permitted the detection of 0.02 ng ml(-1) of Mn(II) and 0.08 ng ml(-1) of Fe(III) with enrichment factors of 31 and 25 for Mn(II) and Fe(III), respectively. The proposed method was applied to determination of trace manganese(II) and iron(III) in water samples with satisfactory results.
浊点萃取（CPE）被用作水样中锰（II）和铁（III）的石墨炉原子吸收光谱法（GFAAS）测定之前的预富集步骤。与1-苯基-3-甲基-4-苯甲酰基-5-吡唑啉酮（PMBP）络合后，分析物可被定量萃取到富含表面活性剂对辛基聚乙二醇苯基醚（Triton X-100）的相中并被富集，然后通过GFAAS进行测定。详细研究了影响萃取效率的参数，如溶液pH值、PMBP和Triton X-100的浓度、平衡温度和时间。在最佳条件下，对10 ml样品溶液进行预富集，可检测到0.02 ng ml⁻¹的锰（II）和0.08 ng ml⁻¹的铁（III），锰（II）和铁（III）的富集因子分别为31和25。该方法应用于水样中痕量锰（II）和铁（III）的测定，结果令人满意。
