Atomic fluorescence spectrometry of determination arsenic and mercury in drinking water

Objective To study the method of AFS-230 dual channel atomic fluorescence spectrometer determination of arsenic and mercury in drinking water,provided basis for detecting arsenic and mercury in water samples.Method Studying the effect of negative high voltage,lamp current,carrier gas and shielding gas flow rate,atomization height,hydrochloric acid and potassium borohydride concentration on detection.At the best working conditions of instrument,studied the detection limit,linearity range,precision and addition standard recovery and so on.Results The concentration of arsenic and mercury respectively at the range of 0~20ng/mL and 0~1.0ng/mL showed good linear relation,correlation coefficient were all above 0.9 997;arsenic and mercury detection limits were 0.0 034ng/mL and 0.0 004ng/mL respectively.Detecting the mixed solution contain arsenic and mercury,the relative standard deviation were less than 0.7% and 1.0%(n=11) respectively and recovery rate was between 96% to 105%.Conclusions This method was simple,high sensitivity,good precision,fast and convenient for widely application,it suited for arsenic and mercury determination and with satisfactory results.