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.
Taher
M A
MA
Department of Chemistry, Shahid Bahonar University of Kerman, Iran. taher@arg3.uk.ac.ir
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