Determination of Arsenic and Cadmium in Water by Sequential Injection Hydride Generation Atom Fluorescence Spectrometry

Objective To establish a method for simultaneous determination of arsenic and cadmium in water by sequential injection hydride generation-atomic fluorescence spectrometry.Method The influence of instrument parameters such as the negative high voltage on the photomultiplier,current of lamp,carrier gas rate,shield gas rate,sensitizer on the determination of arsenic and cadmium were studied.Result When the concentration of hydrochloric acid and potassium borohydride were 0.60 mol/L and 20 g/L respectively,the concentration of sensitizer sulfocarbamide and Co2+ were 80 g/L and 70 mg/L respectively,the effect of determination of arsenic and cadmium was perfect.Under the proposed conditions,the detection limits of arsenic and cadmium were 0.009 3 μg/L and 0.12 μg/L respectively.The standard addition recoveries for arsenic and cadmium were 92.3%~103.9%.The maximum RSD found was 3.5%.The coexistence ions in determined water samples did almost not interfere in the determination of arsenic and cadmium.Conclusion The operation of this method was easy and its sensitivity was higher.There are feasibility and practicability to determine arsenic and cadmium in water.