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Food Chem. 2014 May 15;151:300-5. doi: 10.1016/j.foodchem.2013.11.082. Epub 2013 Nov 22.

Solid phase extraction of trace amounts of silver, cadmium, copper, mercury, and lead in various food samples based on ethylene glycol bis-mercaptoacetate modified 3-(trimethoxysilyl)-1-propanethiol coated Fe3O4 nanoparticles.

Author information

1
Faculty of Chemistry, Kharazmi (Tarbiat Moallem) University, Tehran, Iran. Electronic address: mashhadizadeh@yahoo.com.
2
Faculty of Chemistry, Kharazmi (Tarbiat Moallem) University, Tehran, Iran.
3
Quality Control Laboratory, Darou Pakhsh Mfg. Co., Tehran, Iran.

Abstract

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. 1 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.

KEYWORDS:

3-(Trimethoxysilyl)-1-propanethiol; Bis-mercaptoacetate; Heavy metals; Magnetic nanoparticles; Solid phase extraction

PMID:
24423536
DOI:
10.1016/j.foodchem.2013.11.082
[Indexed for MEDLINE]

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