University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Marine -> shellfish -> opepoda

Citations 1

"Determination Of Cadmium In Foodstuffs And Plant Materials By Flow Injection Spectrophotometry Including Ion Exchange"
Anal. Chim. Acta 1995 Volume 306, Issue 2-3 Pages 343-349
JoséA. Gomes Neto, H. Bergamin Filho, Raquel P. Sartini and Elias Ayres G. Zagatto*

Abstract: Dried powdered food or plant material (1 g) was digested with 10 mL of HNO3 for 30 min at 50°C; 2 mL of 30% H2O2 was added and the mixture evaporated to near dryness at 110°C. The residue was dissolved in 10 mL of 0.1 M HNO3 and diluted to 25 mL with water for FIA. The sample stream (3.8 ml/min) merged with an acidic NaCl stream (1.2 ml/min) then the flow passed through a strongly basic AG1 X-8 BioRad column (1 cm x 5 mm i.d.) and the Cd chlorocomplexes were retained. The flow-through the column was reversed and the analyte was eluted with 2 M NaNO3/0.1 M HNO3 (2.9 ml/min). The flow was merged with 75 µg Cd in 0.25 M ammonium acetate solution (1.2 ml/min) and then a second reagent stream which had been formed by merging 0.5 mM Malachite green and 2 M KI in 0.5% ascorbic acid (both at 0.5 ml/min); detection was at 690 nm. The detection limit was 0.11 µg/l Cd; RSD for sample digests containing 19.7 and 5.12 µg/l Cd were 2.26% and 2.72%, respectively (n = 12). The method was validated by analyzing standard reference materials (rice flour, pig kidney, dried copepoda) containing 0.75-2.71 µg/g Cd (results given). A second anion-exchange column was added to the FIA system to enable the analysis of samples which had been mineralized with HNO3/perchloric acid.
Cadmium Ion exchange Spectrophotometry Biorad Reference material