氢化物发生-原子荧光光谱法测定大气颗粒物中的砷形态

采用氢化物发生原子荧光法直接测定不同粒径大气颗粒物中As(Ⅲ)和As(Ⅴ)的含量.研究了还原剂用量、酸介质及其酸度、载气及屏蔽气流量和观测高度等对荧光强度的影响,探讨了共存离子对砷测定的干扰.在选定的最佳条件下,得到检出限为0.34μg/L,方法检出限为0.21μg/g,加标回收率为98.18%～102.54%,相对标...

Determination of Inorganic Arsenic in Atmospheric Particles by Hydride Generation-atomic Fluorescence Spectrometry

Concentration of atmospheric particles is one of the atmospheric pollution indicators.Heavy metals in the atmospheric particles can risk for human health in both direct and indirect way.Arsenic is one of the higher metal content in them.The inorganic compounds are far more toxic than their organic metabolites.In this paper,the hydride generation atomic fluorescence spectrometric method was employed to the determination of As(Ⅲ) and As(Ⅴ) in the Atmospheric particles.The amount of reducing agent,acid medium and its acidity,carrier gas and shield gas flow rate and observation height of the fluorescence intensity were investigated,and the interference experiment was carried out for concomitant elements.In the best conditions,the detection limit was 0.34 μg/L,the recovery ranged from 98.18%～ 102.54%,and the relative standard deviation was about 0.8%.The method was featured by easy operation,fast speed and it has been applied to the analysis of arsenic in the particles with satisfactory results.