Title: Determination of chromium in environmental samples by flame AAS with flow injection on-line coprecipitation
Abstract: A flow injection on-line coprecipitation flame atomic absorption spectrometric (FAAS) system for the determination of Cr was developed to improve the sensitivity and selectivity of chromium determination in environmental samples, Cr(III) was preconcentrated and separated from potential interferents by on-line coprecipitation with Ianthanum hydroxide. The precipitate was collected on the walls of a knotted reactor without filtration, dissolved by 0.5 mol/L HCI at a flow rate of 6 mL/min and introduced into the nebulizer-burner system of the spectrometer. 1,10-phenanthroline and sulphosalicylic acid were added to the sample solution to eliminate interferences from Fe(II), Zn(II), and Al(III), Speciation of Cr(III) and Cr(VI) in water samples was achieved by reducing Cr(VI) to Cr(III) for the determination of total Cr, and omitting the reduction for Cr(lll) determinations. A concentration efficiency of 22-fold per minute and a detection limit (3 sigma) of 0.8 mu g/L mere achieved for a 110-s loading time. The relative standard deviation (n=11) was 2.7% at the 50-mu g/L chromium level. The analytical results obtained for human hair and water standard reference materials were in good agreement with the certified values.
Publication Year: 1996
Publication Date: 1996-01-01
Language: en
Type: article
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Cited By Count: 14
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