✍ Scribed by J.V. Gimeno Adelantado; V. Peris Martinez; F. Fosch Reig; M.T. Doménech Carbó; F. Bosch Mossi
No coin nor oath required. For personal study only.
An x-ray fluorescence method is proposed for the multi-elemental determination of toxic elements in plastic articles for children, viz., Sb(III), Ba, Cd, Cr(III), Hg, Pb and As(III). Mineralization is achieved by using molten sodium hydroxide to decompose the organic matrix, with sodium nitrate as auxiliary oxidant. Stable solutions containing the chemical species for analysis are obtained. The species are separated from the solution by (co)precipitation, in a medium of NH~'-NH 3 buffer (pH 8.5) with sodium dietbyldithiocarbamate, sodium rhodizonate and Fe 3+, which acts as a carrier. The precipitates deposited on filter-paper are placed in the x-ray spectrometer in fine layer morphology. The method was applied to several plastics of different characteristics, all components of children's toys. The suggested method is statistically comparable to the method that includes a reference destruction of organic matter for each element studied and subsequent determination by atomic absorption spectrometry.
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