Multivariate optimization and validation of an analytical method for the determination of cadmium in wines employing ET AAS

Journal of the Brazilian Chemical Society

Sérgio L. C. Ferreira²  Robson M. De Jesus²  Geraldo D. Matos²  Jailson B. De Andrade²  Roy E. Bruns¹  Walter N. L. Dos Santos¹  Danuza D. Cavalcante¹  Maria G. R. Vale¹  Morgana B. Dessuy¹ 

[1] ,Universidade Federal da Bahia Instituto de Química Salvador BA ,Brazil

关键词: cadmium;    ET AAS;    Brazilian wines;    cadmium in Brazilian wines;   

DOI  :  10.1590/S0103-50532009000400022

来源: SciELO

【 摘 要 】

This work describes the optimization and validation of a direct method employing electrothermal atomic absorption spectrometry (ET AAS) for the determination of cadmium in wine. The optimization step was carried out using a two-level full factorial design, involving the followings factors: pyrolysis time (10 s) and temperature (600 ºC), atomization temperature (1300 ºC) and modifier mass (15 µg). Under the optimized conditions, a characteristic mass of 0.7 pg and limits of detection and quantification of 0.030 and 0.100 µg L-1, respectively, were obtained using a sample volume of 20 µL. The precision expressed as relative standard deviation (RSD %) was 0.30, 0.37 and 0.49% for wines with cadmium concentrations of 1.286, 0.266 and 0.356 µg L-1, respectively. The accuracy of the new direct determination methodology applying ET AAS was assessed by comparison with an acid digestion methodology, also with determination by ET AAS, using five wine samples. The proposed method was applied for the determination of cadmium in 30 Brazilian wine samples. The cadmium content varied from 0.146 to 1.563 µg L-1; all these values are lower than the permissible maximum level stipulated by the International Organization of Vine and Wine (OIV) and also by Brazilian legislation, which is 10 µg L-1.

【 授权许可】

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