Abstract
A new method for the simultaneous determination of As and Sb by using AFS coupled with a newly designed electrochemical hydride generator has been developed. The hydride generator is a tubular electrolytic cell of 28 mm i.d. and 45 mm length, which consists of a graphite tube cathode and a platinum anode. Gaseous hydrides of As and Sb are generated at the cathode. Through a gas–liquid separator, the hydrides are directly transported to the atomizer by an Ar flow for determination. A detection limit of 0.50 and 0.30 μg l −1 (3 σ) for As and Sb in synthetic samples containing10 mg l −1 Cu, Ni and Co was obtained, respectively. The precision ( n = 11) for 50 μg l −1 As and Sb was 2.1 and 1.5%, respectively. The method was successfully applied for determination of total As and Sb in Chinese medicine samples.
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