Journal
FOOD ANALYTICAL METHODS
Volume 6, Issue 5, Pages 1320-1329Publisher
SPRINGER
DOI: 10.1007/s12161-012-9545-9
Keywords
Cadmium; Copper; Nickel; Lead; Dithizone; SBA-15 nanoporous silica; Agricultural product; Food products; Flame atomic absorption spectrometry
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A novel sorbent for simultaneous separation of cadmium, copper, nickel, and lead was prepared by functionalizing SBA-15 nanoporous silica with dithizone. A solid-phase extraction method using the above sorbent was developed to separate and preconcentrate trace amounts of cadmium, copper, nickel, and lead ions from food and agricultural products by flame atomic absorption spectrometry measurements. The optimum experimental conditions such as pH; flow rates; type, concentration, and volume of the eluent; breakthrough volume; and effect of coexisting ions on the separation and determination of these heavy metals were evaluated. The extraction efficiencies for the mentioned heavy metals were greater than 97 %, and the limits of detection were 0.09, 0.16, 0.21, and 0.45 mu g L-1 for cadmium, copper, nickel, and lead, respectively. The preconcentration factor for simultaneous analysis of the four heavy metals was found to be 100 approximately. The relative standard deviations of the method were < 5 % for 10 separate column experiments for the determination of 5.0 mu g of cadmium, copper, nickel, and lead ions. The adsorption capacity of the dithizone-SBA-15 was 189 mg g(-1) for cadmium, 102 mg g(-1) for copper, 91 mg g(-1) for nickel, and 208 mg g(-1) for lead.
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