Determination of chromium in toothpastes by atomic absorption spectrometry

Determination of Chromium in Toothpastes by Atomic Absorption Spectrometry Determination of chromium in toothpastes by atomic absorption spectrometry (FAAS and GFAAS) method has been suggested. Various optimum conditions have been determined by FAAS (air and acetylene gas flow rate, the influence acids concentration, and the influence of 16 ions on the determination of chromium) and GFAAS (pyrolysis and atomization temperatures, matrix modifier). The main analytical characteristics for determination of chromium by the FAAS (the calibration graph was linear in the range of 0,25 and 6,0 µg/mL, the correlation coefficient was r = 0,9990 and the lowest concentration of the analyte (chromium) that can be confidently detected by the method was 0,08 µg/mL) and GFAAS (the calibration curve was linear in the concentration range from 2,0 to 30,0 µg/L, the correlation coefficient was r = 0,9990, and limit of chromium detection was 0,7 µg/L) were evaluated. The determination of chromium in toothpastes by FAAS and GFAAS has been applied. The concentration of chromium ranges from 0,060 to 0,580 mg/kg. The relative standard deviation was in the range from 1,5 to 6,8 %