Magnetic solid-phase extraction based on the Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine followed by atomic absorption spectrometry for cadmium monitoring in water, tomato and cabbage samples
Yasaman Sanaei, M. Zeeb, S. Homami, A. Monzavi, Z. Khodadadi
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引用次数: 2
Abstract
Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine (CCF/ZIF-71/Fe3O4/PTh) was fabricated, characterized, and applied as efficient magnetic sorbent in magnetic solid-phase extraction (MSPE) of cadmium from water and food samples before determination by flame atomic absorption spectrometry (FAAS). This modification of carbonized cotton fabric led to making a great surface area and porosity, increase extraction efficiency, and acceptable selectivity. The characterization of this proposed sorbent was performed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and Fourier transform-infrared (FT-IR) spectroscopy analysis techniques. The impact of several analytical parameters including pH, sorbent dosage, time of extraction, desorption condition, chelating agent concentration, the amount of salt and effect of potentially interfering ions on the selectivity and extraction recoveries of cadmium, were evaluated and optimized. In this proposed methodology, the limit of detection (LOD), the limit of quantification (LOQ), and relative standard deviation (RSD, n = 3) were found to be 0.21 ng mL−1, 0.6 ng mL−1 and lower than 3.0%, respectively. The validation and accuracy of the new advanced procedure were confirmed by applying the proposed procedure for certified reference materials (SRM1570A). Eventually, CCF/ZIF-71/Fe3O4/PTh can be utilized as a selective sorbent, for the rapid, accurate and sensitive determination of Cd (II) in the samples.
制备了碳化棉织物/咪唑酸分子筛框架-71/Fe3O4/聚硫氨酸(CCF/ZIF-71/Fe3O4/PTh),对其进行了表征,并将其作为高效磁性吸附剂应用于水和食品样品的磁固相萃取(MSPE)中,然后用火焰原子吸收光谱法(FAAS)测定。对炭化棉织物进行改性,使其比表面积和孔隙率大,萃取效率提高,选择性好。采用x射线衍射(XRD)、场发射扫描电镜(FE-SEM)和傅里叶变换红外(FT-IR)光谱分析技术对该吸附剂进行了表征。考察了pH、吸附剂用量、提取时间、解吸条件、螯合剂浓度、盐用量以及潜在干扰离子对镉的选择性和提取率的影响。在该方法中,检测限(LOD)、定量限(LOQ)和相对标准偏差(RSD, n = 3)分别为0.21 ng mL - 1、0.6 ng mL - 1和小于3.0%。通过应用经认证的标准物质(SRM1570A)的建议程序来确认新先进程序的有效性和准确性。最终,利用CCF/ZIF-71/Fe3O4/PTh作为选择性吸附剂,可快速、准确、灵敏地测定样品中的Cd (II)。