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首页> 外文期刊>Journal of Analytical Atomic Spectrometry >Trace determination of cadmium(ⅱ) and copper(ⅱ) in environmental water samples by solid-phase extraction using a novel ionic liquid-modified composite sorbent combined with flame atomic absorption spectrometry
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Trace determination of cadmium(ⅱ) and copper(ⅱ) in environmental water samples by solid-phase extraction using a novel ionic liquid-modified composite sorbent combined with flame atomic absorption spectrometry

机译：新型离子液体改性复合吸附剂-火焰原子吸收光谱法固相萃取-痕量法测定环境水样中的痕量镉和铜

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摘要

A sensitive and reliable analytical method for determination of trace Cd(ⅱ) and Cu(ⅱ) in environmental water was developed, based on solid-phase extraction (SPE) using a novel ionic liquid-modified composite as the sorbent combined with detection by flame atomic absorption spectrometry (FAAS). This new sorbent was prepared using a hydrophobic ionic liquid 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIM] [PF_6]) immobilization onto the surface of nano-TiO_2 supported on fine glass beads, and characterized by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Application of the sorbent was investigated for extraction and preconcentration of Cd(ⅱ) and Cu(ⅱ) from aqueous solutions as their chelates with 2-[(5-bromo-2-pyridyl)azo)-5-(diethl-amino) phenol (5-Br-PADAP). It was found that the adsorption of these chelates on the sorbent followed a Langmuir-type isotherm, and the adsorption kinetics were reasonably rapid. This novel SPE adsorbent allowed faster sample loading and higher extraction recovery than conventional nano-TiO_2 particles, and could be used repeatedly at least for 10 times without significant decrease in recovery of Cd(ⅱ) and Cu(ⅱ). The parameters that affect the SPE recovery of both metal ions were examined. The optimum conditions, including sample pH, eluent type and volume, as well as sample and eluent flow rates were obtained. The detection limits were 0.1 and 0.3 μg L~(-1), and the intra-day relative standard deviations (RSDs, n = 6) were 2.0% and 1.4% for Cd(ⅱ) and Cu(ⅱ), respectively. The proposed method was successfully applied to the determination of trace amounts of Cd(ⅱ) and Cu(ⅱ) in environmental water samples.
机译：基于固相萃取（SPE），采用新型离子液体改性复合材料作为吸附剂，并结合火焰检测，建立了一种灵敏可靠的测定环境水中痕量Cd（ⅱ）和Cu（ⅱ）的分析方法原子吸收光谱法（FAAS）。使用疏水性离子液体1-辛基-3-甲基咪唑鎓六氟磷酸盐（[OMIM] [PF_6]）固定在细玻璃珠上负载的纳米TiO_2表面上制备了这种新型吸附剂，并通过傅里叶变换红外光谱（FT- IR）和热重分析（TGA）。研究了吸附剂的应用，以2-[（5-溴-2-吡啶基）偶氮）-5-（二氨基-氨基）苯酚为螯合物从水溶液中萃取和预浓缩Cd（ⅱ）和Cu（ⅱ） （5-Br-PADAP）。发现这些螯合物在吸附剂上的吸附遵循朗缪尔型等温线，并且吸附动力学相当快。与传统的纳米TiO_2颗粒相比，这种新型SPE吸附剂具有更快的样品加载速度和更高的提取回收率，并且可以重复使用至少10次，而Cd（ⅱ）和Cu（ⅱ）的回收率却没有显着降低。检查了影响两种金属离子SPE回收率的参数。获得了最佳条件，包括样品pH，洗脱液类型和体积，以及样品和洗脱液的流速。检出限为0.1和0.3μgL〜（-1），Cd（ⅱ）和Cu（ⅱ）的日内相对标准偏差（RSDs，n = 6）分别为2.0％和1.4％。该方法成功地用于环境水样中痕量Cd（ⅱ）和Cu（ⅱ）的测定。

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  • 来源
    《Journal of Analytical Atomic Spectrometry》 |2014年第9期|1692-1697|共6页
  • 作者

    Jianping Zou; Xiaoguo Ma; Yongfeng Dang; Yuan Chen;

  • 作者单位

    School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China;

    School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China;

    School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China;

    School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China;

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