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Solid phase extraction of ultra-trace levels of lead using tannic acid coated graphene oxide as an efficient adsorbent followed by electrothermal atomic absorption spectrometry; Response Surface Methodology - Central Composite Design

Abstract

Highly efficient and rapid solid phase extraction technique was used for preconcentration of ultra-trace levels of lead (Pb2+) followed by electrothermal atomic absorption spectrometry (ETAAS). Tannic acid coated graphene oxide (TA-GO) was used as a powerful adsorbent in solid phase extraction for the first time. The results of scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) show that TA-GO adsorbent was synthesized successfully. In order to optimize the experimental conditions, response surface methodology (RSM) with four factors including pH, amounts of adsorbent, extraction time and desorption time was used. Based on the results of central composite design (CCD); pH 5.2, 4.2 mg of TA-GO adsorbent, 12.05 min extraction time and desorption time of 2 min were selected as the optimum conditions. Under the optimum conditions, the calibration curve was linear in the range of 0.05 -1.5 ng mL-1 Pb2+. The relative standard deviation (RSD) based on six replicate analysis of 0.4 ng ml-1 Pb2+ and limit of detection (LOD) were 3.8 % and 0.015 ng mL-1, respectively. The accuracy of the proposed method was checked by analyzing the certified reference material (CRM-TMDW). Finally this technique was applied for determination of ultra-trace levels of Pb2+ in different real samples.

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Publication details

The article was received on 26 Aug 2017, accepted on 07 Dec 2017 and first published on 07 Dec 2017


Article type: Paper
DOI: 10.1039/C7NJ03226A
Citation: New J. Chem., 2017, Accepted Manuscript
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    Solid phase extraction of ultra-trace levels of lead using tannic acid coated graphene oxide as an efficient adsorbent followed by electrothermal atomic absorption spectrometry; Response Surface Methodology - Central Composite Design

    M. eftekhari, M. Gheibi, M. akrami and F. Iranzad, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03226A

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