4.7 Article

Pyridine-functionalized mesoporous silica as an adsorbent material for the determination of nickel and lead in vegetables grown in close proximity by electrothermal atomic adsorption spectroscopy

Journal

FOOD CHEMISTRY
Volume 127, Issue 1, Pages 364-368

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2010.12.159

Keywords

MCM-48; Nickel determination; Lead determination; ETAAS; Vegetable

Funding

  1. Vice-President's Office for Research Affairs of Shahid Beheshti University

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A new, sensitive, and low cost solid-phase extraction method using pyridine-functionalized MCM-48 mesoporous silica for the extraction, pre-concentration, and electrothermal atomic absorption spectrometric determination of nickel and lead in food samples at ng mL(-1) levels is described herein. The levels of nickel and lead in different types of vegetables grow in Shiraz-Iran and Rafsanjan-Iran were determined by electrothermal atomic absorption spectrometry. The use of two standard reference materials and also comparing the results to a standard reference procedure ensured the accuracy of this method. Factors, such as flow rate of extraction, and the type, pH, concentration, and volume of eluent, were appraised. The effect of various ions on recovery was also investigated. Detection limits of 0.11 and 0.14 ng mL(-1) were obtained for lead and nickel, respectively. (C) 2011 Elsevier Ltd. All rights reserved.

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