Determination of Iodine in Food by Isotope Dilution Inductively Coupled Plasma Mass Spectrometry
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Abstract:
A method for the determination of iodine in food by isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) was established, combined with sealed glass tube extraction technology. After addition of the isotopic labeled Tellurium (128Te) and tetramethylammonium hydroxide (TMAH) as extraction solution into a sealed glass tube, the homogenized sample was shocked in a water bath to obtain an extract suitable for analysis by ICP-MS, and the internal standard was used for quantitative analysis. Under the optional conditions, the linear range was between 0.025 μg/L and 50 μg/L with the linear correlation coefficients of 0.9999, and the linear equation was y = 1.0506x +1.2511. The detection limit was 1.8 μg/kg when the sample mass was 0.1 g. The mean recoveries for food samples at three spiked concentrations levels of 2.50, 5.00 and 10.00 mg/kg were ranged from 80.29% to 104.70% with relative standard deviation (RSD, n=6) less than 5.0%. The ID-ICP-MS method for determination of the iodine in standard material GBW08517 of kelp presented no significant differences between measured values and certified values. Due to the simplicity, accuracy and high sensitivity, this method was suitable for the determination of iodine in various of food.
