浊点萃取富集-火焰原子吸收光谱法测定水样中痕量锌  

FAAS Determination of Trace Amounts of Zinc in Water Samples with Cloud Point Extraction

作　　者：徐红波[1,2] 郭杏林[2] 孙挺[1] 何路[2] 

机构地区：[1]东北大学理学院,沈阳110006 [2]辽宁科技大学化学工程学院,鞍山114051

出　　处：《理化检验（化学分册）》2010年第9期1020-1022,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：以1-（2-吡啶偶氮）-2-萘酚（PAN）为络合剂,在pH 7.0磷酸盐缓冲溶液中,痕量锌（Ⅱ）与PAN生成络合物,加入非离子表面活性剂OP-8用浊点萃取分离富集水样中痕量锌。分取部分表面活性剂相用盐酸溶解,所得溶液直接用火焰原子吸收光谱法进行测定。对影响浊点萃取的因素和共存离子的干扰等进行了试验并予以优化。方法的检出限（3σ）为2.4μg.L^-1。应用所提出的方法测定了水样中锌的含量,并用标准加入法进行方法的回收试验,测得回收率在95.0%-103.6%之间。Trace amount of Zn（Ⅱ） was separated and enriched from the sample solution buffered at pH 7.0 with phosphate buffer in the form of a coordination complex with PAN by cloud point extraction using OP-8 as non-ionic surfactant.An aliquot of the surfactant phase was taken and dissolved in HCl solution and its zinc content was determinaed by FAAS.Factors influential to cloud point extraction,and interferences of co-existing ions were studied and optimized.Detection limit（3σ） of the method was found to be 2.4 μg·L^-1.The proposed method was applied to the determination of zinc in water samples,and values of recovery obtained by standard addition method were in the range of 95.0%-103.6%.

关 键 词：火焰原子吸收光谱法 浊点萃取 锌 水样 

分 类 号：O657.31[理学—分析化学]