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

Quimica nova

Oliveira, Pedro Vitoriano¹  Souza, Marielle Garcia¹  Vieira, Edivan Carvalho¹ 

[1] Universidade de São Paulo, São Paulo, Brasil

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 describesmethods for the simultaneous determination of Cd and Pb by graphite furnaceatomic absorption spectrometry and As by hydride generation atomic absorptionspectrometry in Brazilian nuts. The samples (~ 0.300 g) were digested to clearsolutions in a closed vessel microwave oven. The pyrolysis and atomization temperaturesfor 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. Thelimits of detection (3Δ)were 3.8 μgkg-1 for As, 0.86 μgkg-1 for Cd and 13 μgkg-1 for Pb. The reliability of the entire procedures was confirmedby peach leaves (No. 1547 - NIST) certified reference material analysis andaddition and recovery tests. The found concentrations presented no statisticaldifferences at the 95% confidence level.

【 授权许可】

CC BY