Affiliation:
1. U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, Elemental Research Branch, College Park, MD 20740
Abstract
Abstract
Radioisotopic X-ray fluorescence spectrometry (RXRFS) performed with an analyzer based on a 241Am excitation source was investigated as a potential field method for screening housewares for the presence of toxic elements. A compact system based on commercially available detection and multichannel analyzer components was used to measure surface concentrations of Au, Ba, Bi, Cd, Ce, Co, Cs, Cu, Fe, La, Pb, Sb, Sn, Sr, Zn, and Zr in a wide variety of housewares and other food-related items. Certified reference material solders, glasses, and paint films and well-characterized oven-fired test tile glazes, solders, and metal can seams were analyzed to determine element sensitivities and analytical limits and to demonstrate the accuracy of the instrument. With analysis times of 3–5 min, the analyzer demonstrated 3σ limits of detection of ≤100 μg/cm2 for elements with Z = 40–65 and Z > 70. Very good accuracy was demonstrated for glaze and thin-sample analyses, whereas analysis was possible for solders and metal can seams with greater uncertainties (20–40%). Two commercially available handheld RXRFS analyzers, evaluated as part of the study, yielded results that agreed well with those obtained with the 241Am-based RXRFS system.
Publisher
Oxford University Press (OUP)
Subject
Pharmacology,Agronomy and Crop Science,Environmental Chemistry,Food Science,Analytical Chemistry
Cited by
4 articles.
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