Determination of mercury in rice by cold vapor atomic fluorescence spectrometry after microwave-assisted digestion

作者：Jose da Silva Maria; Palm Ana Paula S; Fernanda Pimentel Maria; Luisa Cervera M; de la Guardia Miguel

来源：Analytica Chimica Acta, 2010, 667(1-2): 43-48.

DOI：10.1016/j.aca.2010.04.016

• Cold vapor
• Atomic fluorescence spectrometry
• Mercury
• Microwave digestion
• Rice

A cold vapor atomic fluorescence spectrometry method (CV-AFS) has been developed for the determination of Hg in rice samples at a few ng g(-1) concentration level. The method is based on the previous digestion of samples in a microwave oven with HNO(3) and H(2)O(2) followed by dilution with water containing KBr/KBrO(3) and hydroxylamine and reduction with SnCl(2) in HCl using external calibration. The matrix interferences and the effect of nitrogen oxide vapors have been evaluated and the method validated using a certified reference material. The limit of detection of the method was 0.9 ng g(-1) with a recovery percentage of 95 +/- 4% at an added concentration of 5 ng g(-1). The concentration level of Hg found in 24 natural rice samples from different origin ranged between 1.3 and 7.8 ng g(-1).

• 出版日期2010-5-14