Fast determination of lead and copper in dairy products by graphite furnace atomic absorption spectrometry.
A rapid and direct procedure for determining lead and copper in dairy products by electrothermal atomic absorption spectrometry (ETAAS) is described. Samples are slurried in a medium containing 50% v/v hydrogen peroxide, 1% v/v nitric acid, 0.5% w/v dihydrogen phosphate, and 20% v/v ethanol and directly injected into the furnace with no previous mineralization. Calibration is performed with aqueous standards. Limits of determination were 0.4 and 2.4 ng/mL for copper and lead, respectively. The reliability of the procedure was checked by comparison with the acid mineralization procedure and by analyzing 3 certified reference milk samples.
Viñas
P
P
University of Murcia, Faculty of Chemistry, Department of Analytical Chemistry, Murcia, Spain.
Pardo-Martínez
M
M
Campillo
N
N
Hernández-Córdoba
M
M
D002138:Calibration; D003300:Copper / Q000032:analysis*; D003611:Dairy Products / Q000032:analysis*; D000431:Ethanol; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000008:administration & dosage; D007854:Lead / Q000032:analysis*; D017942:Nitric Acid; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000379:methods*
D007854:Lead; D000431:Ethanol; D017942:Nitric Acid; D003300:Copper; D006861:Hydrogen Peroxide