Journal
FOOD CHEMISTRY
Volume 151, Issue -, Pages 300-305Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.11.082
Keywords
Magnetic nanoparticles; Bis-mercaptoacetate; Solid phase extraction; Heavy metals; 3-(Trimethoxysilyl)-1-propanethiol
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Extraction, pre-concentration, and determination of trace amounts of silver, cadmium, copper, mercury, and lead from some food samples were investigated by magnetic solid phase extraction using Fe3O4 nanoparticles coated with 3-(trimethoxysilyl)-1-propanethiol and modified with ethylene glycol bis-mercaptoacetate as a new adsorbent. SEM, X-ray diffraction, and FT-IR were used to characterise the adsorbent. Metal ions were measured using ICP-OES, except for mercury, which was determined by CV-AAS method. Various factors affecting the extraction and desorption of target metal ions were investigated. I mL of 1 mol/L HCl and 5% thiourea was used as eluent. The detection limits of 0.07, 0.06, 0.09, 0.01, and 0.08 ng/mL were obtained for silver, cadmium, copper, mercury, and lead with enrichment factors of 240, 294, 297, 291, and 236, respectively. The method was used for determination of target metal ions in rice, canned tuna fish, and tea leaves. (C) 2013 Elsevier Ltd. All rights reserved.
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