期刊
MICROCHIMICA ACTA
卷 183, 期 1, 页码 91-99出版社
SPRINGER WIEN
DOI: 10.1007/s00604-015-1596-3
关键词
Graphene oxide; Dispersive micro solid-phase extraction; Microextraction; Energy dispersive X-ray fluorescence spectrometry; Preconcentration
This article describes a new procedure for multi-element preconcentration of heavy metal ions, specifically of Cr(III), Co(II), Ni(II), Cu(II), Zn(II) and Pb(II) ions. The method is based on dispersive micro solid-phase extraction (DMSPE) of the metal complexes of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) by graphene oxide nanoparticles prior to energy dispersive X-ray fluorescence spectrometric (EDXRF) determination. The effects of pH, amount of graphene oxide, concentration of complexing reagent, sample volume and sorption time were optimized. The influence of commonly encountered other ions was also investigated. Under optimal conditions, the calibration plots cover the 2 to 150 ng mL(-1) range for each element. The precision (at a 20 ng mL(-1) level for n = 10) is lower than 4.8 %, and the detection limits range is from 0.07 to 0.25 ng mL(-1). The DMSPE-EDXRF procedure was successfully applied to the determination of heavy metal ions in water and spiked water samples with recoveries between 94.4 and 103.5 %.
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