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    STUDIA CHEMIA - Issue no. 1-2 / 2000  
         
  Article:   FLAME ATOMIC EMISSION DETERMINATION OF POTASSIUM IN NATURAL WATERS WITH THE METHANE-AIR FLAME AS EXCITATION SOURCE.

Authors:  LADISLAU KÉKEDY-NAGY, EMIL A. CORDOŞ.
 
       
         
  Abstract:  The potassium content of some natural (well and mineral) waters and drinking water (tap) has been determined by flame atomic emission spectrometry using the methane-air flame. Effects of the flame and of instrumental parameters (flame composition, the observation height, the spectral bandpass of the monochromator) on the emission of potassium in methane-air flame was studied and optimized. The best results were obtained using the 766.4 nm potassium line at the observation height of 11 mm, with the flame composition of 1.12 (relative stoichiometric units, RSU) and the slit width of 0.7 mm. The effect of Li, Na, Rb, Cs, Mg, Ca, Sr, Al, Cl-, SO42-, PO43- and ClO4- on the emission of potassium was studied too. The detection limit of 0.3 0.04 μg.l-1 was obtained, in the presence of 200 mg.l-1 Cs, at a significance level of 0.05 using the two-step Neyman-Pearson criterion. The potassium content of waters has been determined directly using both external calibration curve and standard addition method. The results agree between these two methods.  
         
     
         
         
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