HG-AFS Determination of Inorganic Arsenic in Readymade Chinese Traditional Medicines by Extraction with Hydrochloric Acid

Trace amounts of inorganic arsenic in the medicine sample was extracted with 6 moL·L-1 HCl by heating at 60 ℃ in a water bath,and transferred into solution in the form of chloride. The sample solution was used for hydride generation and AFS determination. Linearity was held within arsenic concentrations of 50 μg·L-1 with its peak area (r=0.999 6). Detection limit (n=11) was found to be 0.34 μg·L-1. Values of RSD′s (n=7) and recoveries obtained,in the analysis of 2 medicine samples,were less than 4.0% and in the range of 92.6%-104.0% respectively.