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

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 2O 2 followed by dilution with water contai...

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Bibliographic Details
Published in:	Analytica chimica acta Vol. 667; no. 1; pp. 43 - 48
Main Authors:	da Silva, Maria José, Paim, Ana Paula S., Pimentel, Maria Fernanda, Cervera, M. Luisa, de la Guardia, Miguel
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 14-05-2010 Elsevier
Subjects:	Analytical chemistry Atomic fluorescence spectrometry Chemistry Cold Temperature Cold vapor Digestion Exact sciences and technology Fluorescence Gases - chemistry Hydrogen Peroxide - chemistry Mercury Mercury - analysis Microwave digestion Microwaves Nitric Acid - chemistry Oryza - chemistry Oryza sativa Ovens Rice Spectrometric and optical methods Spectrometry Spectrometry, Fluorescence - methods Spectroscopy Tin Compounds - chemistry Atomic fluorescence spectrometry Microwave digestion Mercury Cold vapor Rice Water Monocotyledones Hydrochloric acid Oryza sativa Reduction Microwave oven Gramineae Detection limit Angiospermae Nitrogen oxide Hydroxylamine Sample Matrix effect Concentration Calibration Method Certified reference material Nitric acid Dilution Acid digestion Spermatophyta
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Summary:	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 2O 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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0003-2670 1873-4324
DOI:	10.1016/j.aca.2010.04.016