Evaluation of sample preparation methods and optimization of nickel determination in vegetable tissues

Revista Brasileira de Ciência do Solo

Rodrigo Fernando Dos Santos Salazar²  Marco Aurélio Kondracki De Alcântara¹  Hélcio José Izário Filho¹ 

[1] ,Universidade Federal de São Carlos Doctorate student at Department of Chemistry São Carlos SP

关键词: trace elements;    atomic absorption spectrometry;    calcination;    wet digestion;    environmental pollution;    elementos-traço;    espectrometria de absorção atômica;    calcinação;    digestão úmida;    poluição ambiental;   

DOI  :  10.1590/S0100-06832011000100022

来源: SciELO

【 摘 要 】

Nickel, although essential to plants, may be toxic to plants and animals. It is mainly assimilated by food ingestion. However, information about the average levels of elements (including Ni) in edible vegetables from different regions is still scarce in Brazil. The objectives of this study were to: (a) evaluate and optimize a method for preparation of vegetable tissue samples for Ni determination; (b) optimize the analytical procedures for determination by Flame Atomic Absorption Spectrometry (FAAS) and by Electrothermal Atomic Absorption (ETAAS) in vegetable samples and (c) determine the Ni concentration in vegetables consumed in the cities of Lorena and Taubaté in the Vale do Paraíba, State of São Paulo, Brazil. By means of the analytical technique for determination by ETAAS or FAAS, the results were validated by the test of analyte addition and recovery. The most viable method tested for quantification of this element was HClO4-HNO3 wet digestion. All samples but carrot tissue collected in Lorena contained Ni levels above the permitted by the Brazilian Ministry of Health. The most disturbing results, requiring more detailed studies, were the Ni concentrations measured in carrot samples from Taubaté, where levels were five times higher than permitted by Brazilian regulations.

【 授权许可】

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