میکرو استخراج و تغلیظ همزمان سرب (II)، روی(II) و نقره (I) توسط کامپوزیت نانولوله کربنی سل-ژل تثبیت شده در غشاهای فیبر متخلخل

 Hollow fiber-solid phase microextraction (HF-SPME) technique containing multiwalled carbon nanotubes (MWCNTs) reinforced sol-gel nanocomposite coupled with UV–Vis spectrophotometry was applied for preconcentration and determination of lead, zinc and silver in water samples. In this technique, a high efficiency sorbent containing mixture of MWCNTs and a microporous gel was injected into a piece of a polypropylene hollow fiber for in situ gelation. The method validation was included and satisfying results were obtained. It owes large surface area and porosity of the nano-adsorbent. Under the optimal conditions, linear calibration curves were established for the concentration of Pb2+, Zn2+ and Ag+ in the range of 0.2–7.0, 0.3–7.0 and 2.0–50 µg/mL respectively. The limits of detection were 0.032, 0.057 and 0.325 µg/mL for Pb2+, Zn2+ and Ag+. The relative standard deviations (RSDs) were found to be less than 8.0 %.

Keywords:

Hollow fiber-solid phase microextraction , Spectrophotometry UV-Vis , Multiwalled Carbon Nanotube , Lead (II) , Zinc (II) , Silver (I)