Journal
FOOD CHEMISTRY
Volume 132, Issue 1, Pages 532-536Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2011.10.053
Keywords
Cloud point extraction; Ion-associated complex; Cadmium; Food samples; Atomic absorption spectrometry
Funding
- National Nature Science Foundation of China [20905020]
- Education Department of Henan Province [2009B150008]
- Science and Technology Department of Henan Province [112300410080]
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A new cloud point extraction (CPE) procedure for preconcentration of cadmium prior to the determination by flame atomic absorption spectrometry (FAAS) was developed. The method is based on the fact that cadmium could form hydrophobic ion-associated complex in the presence of iodide and methyl green (MG), and the hydrophobic ion-associated complex could be extracted into surfactant-rich phase. The main factors affecting CPE procedure, such as pH, concentration of KI, MG and surfactant, equilibrium temperature and incubation time, sample volume were investigated. Potential interference from co-existing ions was largely eliminated as most of co-existing ions can not form extractable ion-associated complex with iodide and MG. Under the optimum conditions, the limit of detection (3 sigma) and limit of quantity (10 sigma) were 0.90 ng mL(-1) and 3.0 ng mL(-1) for cadmium, respectively, and relative standard deviation was 4.2% (c = 50 ng mL(-1), n = 7). The proposed method was successfully applied to determination of cadmium in the certified reference rice sample (GBW08510) and food samples with satisfactory results. (C) 2011 Elsevier Ltd. All rights reserved.
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