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    STUDIA CHEMIA - Issue no. 4 / 2011  
         
  Article:   RADIOCHEMICAL DETERMINATION OF URANIUM FOR ENVIRONMENTAL SAMPLES BY OPEN TUBULAR LIQUID CHROMATOGRAPHY AND ALPHA SPECTROMETRY.

Authors:  CONSTANTIN COSMA.
 
       
         
  Abstract:  Uranium-series analyses are an essential component of many research projects in Earth and environmental science and also for the protection of public health. In this work a simple and fast method for the determination of uranium isotopes using open tubular liquid chromatography and alpha spectrometry is described. The uranium standard solution was acidified at pH 1 with hydrochloric acid before separation. A strong base anion resin Dowex AG 1X8 was used for the separation of target compounds. The elution of uranium at different concentrations of hydrochloric acid (0.05; 0.10 and 0.15 M) was tested. After its separation from thorium, the uranium is electrodeposited onto stainless steel discs and then measured by alpha spectrometry. The measurements were performed using an ORTEC SOLOIST alpha spectrometer with PIPS (Passivated Implanted Planar Silicon) detector and the data acquisition was made by ASPEC-927 Dual Multichannel. The results of performed experiments showed that Dowex AG 1X8 resin is a selective sorbent for uranium and it can be used for the preconcentration of uranium isotopes from different aquatic samples.

Keywords: uranium, separation, open tubular liquid chromatography, alpha spectrometry
 
         
     
         
         
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