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Optimization of Instrument Condition for the Analysis for Mercury, Arsenic…

- - - - stannous chloride,SnCl2 as reducing agent used to convert ionic metal ions of mercury Hg2+ to Hg0 (g) for atomization.
- - - - optimized sample flow rate for arsernic, antimony and selenium was approximately 7.0-7.5ml/min while the maximum signal for mercury was approximately 6.5-6.7ml/min.
  - - - optimized flow rate for all reagents was between 0.9-1.0 mL/min
  - - - The optimum flow rate of arsenic, antimony, selenium and mercury were optimized at 0.2,0.2,2.0 and 2.0mL/min respectively.
  - - - optimized instrument read delay time for mercury was 70s and 20s for arsenic, antimony and selenium for eliminating the memory effect.
  - - - Then, diluting them with 250ml deionized water.
        
        30ppb standard was used and the aas was set to zero after each modification and absorbance were measured.
        
        To prevent cross-contamination, deionized water was pumped through the entire system for 60s.
        
        The concentration and type of acid that produced the optimum signals for arsenic, antimony and selenium were 5,10 and 10mol/dm-3.