Direct determination of Pb in raw milk by graphite furnace atomic absorption spectrometry (GF AAS) with electrothermal atomization sampling from slurries

卷:229

de Oliveira, Tatiane Milao ; Peres, Jayme Augusto ; Felsner, Maria Lurdes ; Justi, Karin Cristiane

Univ Estadual Ctr Oeste UNICTR

关键词: Milk;    Direct analysis;    Lead;    GF MS;   

DOI  :  10.1016/j.foodchem.2017.02.143

学科分类：食品科学和技术

【 摘 要 】

Milk is an important food in the human diet due to its physico-chemical composition; therefore, it is necessary to monitor contamination by toxic metals such as Pb. Milk sample slurries were prepared using Triton X-100 and nitric acid for direct analysis of Pb using graphite furnace atomic absorption spectrometry - GF AAS. After dilution of the slurries, 10.00 mu l were directly introduced into the pyrolytic graphite tube without use of a chemical modifier, which acts as an advantage considering this type of matrix. The limits of detection and quantification were 0.64 and 2.14 mu g l(-1), respectively. The figures of merit studied showed that the proposed methodology without pretreatment of the raw milk sample and using external standard calibration is suitable. The methodology was applied in milk samples from the Guarapuava region, in Parana State (Brazil) and Pb concentrations ranged from 2.12 to 37.36 mu g l(-1). (C) 2017 Elsevier Ltd. All rights reserved.