Determination of Arsenic by Atomic Fluorescence Spectrometry with Bi-anode Electrochemical Hydride Generation

Determination of arsenic by atomic fluorescence spectrometry with bi-anode electrochemical hydride generation(BAECHG)was investigated.This novel method reduced the use of chemical reagents and thus reduced environmental pollution because no chemical hydride generation procedure was used.Under the same conditions,the hydride generation efficiency of BAECHG was 99.0%-101.6% of that of chemical hydride generation method.Parameters and interference conditions were investigated.Under the selected conditions,the linear range was 0-120 μg/L for arsenic(As,injection volume: 100 μL).The detection limit(signal to noise ratio of 3∶1) was 0.64 μg/L.The relative standard deviation(RSD) obtained by using standard solution with 60 μg/L of As was 2.0%(n=13).The proposed method was applied to analyze the reference soil sample(GBW07406),the result was consistent with the certified value.The spiked recoveries of piglet feed sample were 97.0%-103.0%.High sensitivity and good repeatibility are the advantages of this method.