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RESEARCH PRODUCT
Determination of mercury in rice by cold vapor atomic fluorescence spectrometry after microwave-assisted digestion.
M. Luisa CerveraMiguel De La GuardiaMaria José Da SilvaAna Paula S. PaimMaria Fernanda Pimentelsubject
Detection limitMicrowave ovenAnalytical chemistrychemistry.chemical_elementTin CompoundsOryzaHydrogen PeroxideMercuryBiochemistryNitric AcidAnalytical ChemistryDilutionMercury (element)Cold Temperaturechemistry.chemical_compoundHydroxylamineCertified reference materialsSpectrometry FluorescencechemistryEnvironmental ChemistryNitrogen oxideGasesMicrowave digestionMicrowavesSpectroscopydescription
Abstract 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 HNO3 and H2O2 followed by dilution with water containing KBr/KBrO3 and hydroxylamine and reduction with SnCl2 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-05-01 | Analytica chimica acta |