Magnetic Multi-Walled Carbon Nanotubes Modified with Polythiophene as a Sorbent for Simultaneous Solid Phase Microextraction of Lead and Cadmium from Water and Food Samples
سال انتشار: 1399
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 128
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شناسه ملی سند علمی:
JR_ANALCH-7-4_008
تاریخ نمایه سازی: 16 بهمن 1401
چکیده مقاله:
Polythiophene (PT) coated magnetic multi-walled carbon nanotubes (MMWCNTs) as a magnetic sorbent was synthesized and characterized by FT-IR, SEM, XRD, and VSM. The sorbent was applied for simultaneous solid-phase microextraction of trace amounts of lead and cadmium ions from various matrices. The retained analytes were eluted using nitric acid solution (۰.۵ mol L-۱) and quantified by flame atomic absorption spectrometry. The main factors affecting the extraction of lead and cadmium such as pH, type and concentration of eluent, amount of the sorbent, ionic strength and sample volume were investigated and optimized. Under the optimized conditions, the detection limits (based on ۳Sb/m) of ۰.۵۴ and ۰.۰۳ µg L-۱ and the enhancement factors of ۱۹۷.۶ and ۱۹۵.۵ were obtained for lead and cadmium, respectively. The relative standard deviations of ۱.۵% (n = ۶) at ۵۰.۰ µg L-۱ of lead and ۲.۱% at ۵.۰ µg L-۱ of cadmium were achieved. The method was found to be effective, selective, rapid, and simple for the determination of trace amounts of lead and cadmium and was successfully applied to the determination of lead and cadmium in water, black tea, rice, and milk samples without evident interference from the complex matrix. Furthermore, the sorbent showed high capacity, and the precision and accuracy of the method were satisfactory. The validity of the method was examined through the recovery experiments and independent analysis by electrothermal atomic absorption spectrometry.
کلیدواژه ها:
Flame atomic absorption spectrometry ، Lead and cadmium ، Magnetic solid-phase microextraction ، Multi-walled carbon nanotubes ، Polythiophene
نویسندگان
Zahra Dehghani
Department of Chemistry, Faculty of Science, Yazd University, Yazd, ۸۹۱۹۵-۷۴۱, Iran. Department of Environmental Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Shayessteh Dadfarnia
Department of Chemistry, Faculty of Science, Yazd University, Yazd, ۸۹۱۹۵-۷۴۱, Iran
Ali Mohammad Haji Shabani
Department of Chemistry, Faculty of Science, Yazd University, Yazd, ۸۹۱۹۵-۷۴۱, Iran
Mohammad Hasan Ehrampoush
Department of Environmental Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran