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    STUDIA CHEMIA - Ediţia nr.1-2 din 1999  
         
  Articol:   FLAME ATOMIC EMISSION DETERMINATION OF CALCIUM IN NATURAL WATERS USING THE METHANE-AIR FLAME.

Autori:  LADISLAU KÉKEDY-NAGY, EMIL A. CORDOÅž. 		 
       
         
  Rezumat:  The calcium content of some natural waters (lake, river, well, mineral water) and drinking water (tap) has been determined by flame atomic emission spectroscopy using the methane-air flame. It was studied and optimized the flame and instrumental parameters (flame composition, the observation height in the flame) on the emission of calcium. The best results were obtained with the calcium line of 422.67 nm at the observation height of 7 mm, with the flame composition of 1.12 (relative stoichiometric units, (RSU)). The effect of pH, Na, K, Mg, Al, Sr, La, ClO4-, SO42-, and PO43- on the emission of calcium was studied too. The calibration curve was linear in the 0.1-10 mg/L range (long optical path in the flame) and 0.1–100 mg/L range (short optical path), respectively. The detection limit of 0.050 ± 0.022 mg/L was obtained at a significance level of 0.05 using the two-step Neyman-Pearson criterion. The calcium content of waters has been determined after suitable dilution of the sample, in the presence of 0.01 N HClO4 , using the calibration curve and the standard addition method. In the presence of interferences the best results were obtained with the standard addition method.  
         
     
         
         
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