浊点萃取-火焰原子吸收光谱法测定四季豆中锌和铜  

Determination of Trace Zinc and Copper in Kidney Beans by Cloud Point Extraction and FAAS

作　　者：黄锋[1] 卢桂英 Huang Feng1 ,Lu Guiying2(IZhaotong Centers for Disease Prevention and Control, Zhaotong 657000, China; 2yiyang Produce Goods Quality Supervision and Inspection Institute, Yiyang 4l 3000, China)

机构地区：[1]云南省昭通市疾病预防控制中心,云南昭通657000 [2]湖南省益阳市产商品质量监督检验研究院,湖南益阳413000

出　　处：《现代科学仪器》2017年第5期109-111,共3页Modern Scientific Instruments

摘　　要：在pH为8．5的缓冲溶液中，以8-羟基喹啉为螯合剂，锌、铜均与8-羟基喹啉生成螯合物，加入TritonX-100表面活性剂用浊点革取分离富集四季豆样品中的锌、铜。取部分表面活性剂相用乙醇定容至25mL，所得溶液直接用火焰原子吸收光谱法进行测定。对影响浊点苹取的因素和共存离子的干扰等进行了试验并予以优化。锌和铜的检出限（3s／k）依次为0．054、0．029mg／L。应用此法测定两种元素的含量，在两种样品中用标准加入法进行方法的回收试验，测得锌的回收率在94．5％～99．4％之间、铜的回收率在93．6％～97．8％之间。The solution buffered at pH 8.0 in the form of coordination complexes with 8-oxine by cloud point extraction using Triton x-100 as surfactant. An aliquot of the surfactant phase was diluted and made up to 25mL with ethanol. The contents of Zn and Cu were determined by FAAS from the Kidney beans. Factors influential to cloud point extraction, and interferences of coexisting ions were surveyed. Detection limits of the method were found to 0.054mg/L for Zn and 0.029 mg/L for Cu. The proposed method was applied to the determination of the 2 elements in samples of red kidney bean and long kidney bean, and values of recovery obtained by standard addition method were found in the ranges of 94.3%-99.4% for Zn and 93.6%-97.8% for Cu.

关 键 词：浊点萃取 火焰原子吸收光谱法 四季豆 锌 铜 

分 类 号：TH7[机械工程—仪器科学与技术]