Determination of As, Cd and Pb in babassu nut and mesocarp, sapucaia, xixa and brazilian nut by atomic absorption spectrometry

Química Nova

Oliveira, Pedro Vitoriano¹  Souza, Marielle Garcia¹  Universidade de São Paulo, São Paulo, Brasil¹  Vieira, Edivan Carvalho¹ 

关键词: atomic absorption;    hydride generation;    Brazilian nut.;   

DOI  :  10.1590/S0100-40422009000600015

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This work describes methods for the simultaneous determination of Cd and Pb by graphite furnace atomic absorption spectrometry and As by hydride generation atomic absorption spectrometry in Brazilian nuts. The samples (~ 0.300 g) were digested to clear solutions in a closed vessel microwave oven. The pyrolysis and atomization temperatures for simultaneous determinations of Cd and Pb were 1100 and 2100 °C, respectively, using 0.5% (w v-1) NH4H2PO4 + 0.03% (w v-1) Mg(NO3)2 as chemical modifier. The limits of detection (3Δ) were 3.8 μg kg-1 for As, 0.86 μg kg-1 for Cd and 13 μg kg-1 for Pb. The reliability of the entire procedures was confirmed by peach leaves (No. 1547 - NIST) certified reference material analysis and addition and recovery tests. The found concentrations presented no statistical differences at the 95% confidence level.

【 授权许可】

Unknown