Resumo

SIBELLO-HERNANDEZ, Rita Y; COZZELLA, Maria Letizia  e  GUILLEN ARRUEBARRENA, Aniel. Applying a Method of Chemical Separation and Mass Spectrometry for the Determination of Radium-226 in Surface Water. Rev Cub Quim [online]. 2014, vol.26, n.3, pp. 159-165. ISSN 2224-5421.

Radium-226 (²²⁶Ra) is a naturally occurring radionuclide, alpha emitter with half-life of 1 622 years originating from uranium-238 (²³⁸U). Its presence in drinking water is a major radiological hazards, which requires constant monitoring. The analytical techniques used in the determination of ²²⁶Ra generally require the stablishment of secular equilibrium and/or tedious separation of other elements. The main objetive of this paper is to demonstrate the efficiency and speed of a method of preconcentration and separation of ²²⁶Ra in natural water samples using coprecipitation with MnO₂ radius and purification by cation exchange resin Dowex 50WX8. Measurement technique was Quadrupole Mass Spectrometry and associated induced plasma ICP-Q-MS. The ²²⁶Ra values obtained are in the range of 0,010-0,219 pg/L in natural waters analyzed.

Palavras-chave : radium; extraction chromatography; mass spectrometry.

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