Analytical Sciences

Quantitative Determination of Bromine and Iodine in Food Samples Using ICP-MS

Thi Kim Dzung NGUYEN* and Rainer LUDWIG**

*Center for Analytical Chemistry, Institute for Technology of Radioactive and Rare Elements, 48 Lang-Ha, Hanoi, Vietnam
**Institute of Chemistry, Freie Universität Berlin, Fabeckstr. 34-36, 14195 Berlin, Germany

Trace concentrations of bromine and iodine in food samples and certified reference materials (CRMs) were determined by an inductively coupled plasma–mass spectrometry (ICP-MS) technique after low-power microwave digestion and extraction into an aqueous quaternary ammonium hydroxide solution. The recovery after sample preparation was quantitative. The internal standard for the measurement of the analyte on ICP-MS was optimized in this study. The detection limits were 0.19 and 0.68 ng g⁻¹ for I and Br, respectively, when a 10 ng g⁻¹ Te solution as an internal standard was used, applying the signal of ¹²⁵Te. The high recovery and reproducibility are sufficient for the quantitative analysis of these elements, and the analytical procedure is recommended for the analysis of Br and I in various kinds of bio-samples.

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