期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 116, 期 -, 页码 1-5出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2013.07.004
关键词
Selenium determination; Dispersive liquid-liquid; microextraction-solidified floating organic drop; Fiber optic-linear array detection; spectrophotometry
类别
A novel dispersive liquid-liquid microextraction-solidified floating organic drop (DLLME-SFOD) method combined with fiber optic-linear array detection spectrophotometry has been developed for the indirect determination of selenium. The method is based on the oxidation of the I- to iodine by inorganic Se(IV). The produced I-2 reacts with the excess of I- ions in acidic media to give triiodide ions. The I-3(-) is then extracted into 1-undecanol by DLLME-SFOD upon the formation of an ion pair with cetyltrimethylammonium cation. The extracted ion pair is determined by measuring its absorption at 360 nm. The absorbance signal is proportional to the selenium concentration in the aqueous phase. Under optimum conditions, the method provided an enrichment factor of 250 with a detection limit of 16.0 mu g L-1 and a linear dynamic range of 40.0-1000.0 mu g L-1. The relative standard deviation was found to be 2.1% (n = 7) at 100.0 mu g L-1 concentration level. The method was successfully applied to the determination of selenium in water samples and selenium plus tablet. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据