Flame atomic absorption spectrometric determination of trace chromium in various standard samples after preconcentration with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol.
Chromium can be quantitatively retained as 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP)-tetra-phenylborate(TPB) complex onto microcrystalline naphthalene in the pH range 4.8-5.9 from a large volume of aqueous solutions of various standard samples. After filtration, the solid mass consisting of the chromium complex and naphthalene was dissolved with 5 mL of dimethylformamide and the metal was determined by air-acetylene FAAS. A detection limit of 4 ng/mL for chromium was established. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the trace determination of chromium in various standard alloys and biological samples.
Department of Chemistry, Shahid Bahonar University of Kerman, Iran. taher@arg3.uk.ac.ir
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D000838:Anions / Q000009:adverse effects; D001391:Azo Compounds / Q000737:chemistry; D002412:Cations / Q000009:adverse effects; D002614:Chelating Agents / Q000737:chemistry; D002857:Chromium / Q000032:analysis* / Q000592:standards; D004785:Environmental Pollutants / Q000032:analysis; D006801:Humans; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000592:standards; D013775:Tetraphenylborate / Q000737:chemistry; D014131:Trace Elements / Q000032:analysis*
D000838:Anions; D001391:Azo Compounds; D002412:Cations; D002614:Chelating Agents; D004785:Environmental Pollutants; D014131:Trace Elements; D002857:Chromium; C037882:2-(5-bromo-2-pyridylazo)-5-diethylaminophenol; D013775:Tetraphenylborate