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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   FLAME ATOMIC EMISSION SPECTROMETRIC DETERMINATION OF BARIUM USING THE METHANE - AIR FLAME. OPTIMIZATION OF THE FLAME AND INSTRUMENTAL PARAMETERS.

Authors:  LADISLAU KÉKEDY-NAGY, EMIL A. CORDOŞ.
 
       
         
  Abstract:  The effect of the flame composition, the observation height in the flame and the bandpass of the monochromator on the emission of barium in the methane-air flame were studied. The effect of Na, K, Mg, Sr, SO42-, and PO43- on the emission of barium was studied too. The best results were obtained with the barium line of 553.5 nm at the observation height of 5 mm, with the fuel rich flame and the slitwidth of 1.5 mm. The detection limit of 0.2 0.1 mg/L was obtained at a significance level of 0.05, using the two step Neyman- Pearson criterion.  
         
     
         
         
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