Highly accurate radiochemical neutron activation analysis of arsenic in biological materials involving selective isolation of arsenic by hybrid and conventional ion exchange

Microchimica Acta - Tập 168 - Trang 37-44 - 2009
Ewelina Chajduk1, Rajmund S. Dybczyński1
1Institute of Nuclear Chemistry and Technology, Warsaw, Poland

Tóm tắt

A highly accurate (definitive) radiochemical neutron activation analysis (RNAA) method was developed for the determination of traces of arsenic (As) in biological materials. It consists of the following steps: (a) irradiation in the nuclear reactor; (b) microwave-assisted sample digestion; (c) quantitative and selective radiochemical separation of arsenates on hydrated ferric oxide nanoparticles dispersed in a macroporous cation exchanger, preceded by a conventional strongly acidic cation exchanger column, and (d) gamma-ray spectrometric measurement of 76As. The suitability and accuracy of the method was demonstrated by analysing several certified reference materials. The detection limit is 8 ng g−1. The standard uncertainty in the determination of As in oriental tobacco leaves is around 3.4%. This, together with its compliance with several other formal requirements, makes the method comparable to primary methods based on isotope dilution mass spectrometry.

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