Abstract
An simple and precise method is described for the determination of arsenic in fluorspar by differential pulse anodic stripping voltammetry without any pretreatment steps using harmful chemicals.Arsenic(V)was reduced to arsenic(III)with potassium iodide.The arsenic(III)in an acidic solution was electrodeposited on a rotating gold-film electrode at −0.45V vs.SCE for 180s, and then a stripping voltammogram was recorded by a positive-going scan at a rate of 40mVs-1 to 0.2V vs.SCE.The calibration{peak height vs.arsenic(III)concentration}curve was linear over the range(1.3∼4.0)×10-7M arsenic(III) and passed through the origin.The detection limit(3σ)was 1.98×10-8M.Copper(II), lead(II), and antimony(III)interfered with the arsenic(III)determination severely.The determination of 10.6μg g-1 of arsenic in fluorspar was achieved with an RSD(n=5)of 3.4% within 3h.The proposed method is an improvement over the existing JIS method.
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