Arsenic speciation in rice by capillary electrophoresis/inductively coupled plasma mass spectrometry: enzyme-assisted water-phase microwave digestion

Journal of Agricultural and Food Chemistry
Haiou QuSean W Linder

Abstract

We report an analytical methodology for the quantification of common arsenic species in rice and rice cereal using capillary electrophoresis coupled with inductively coupled plasma mass spectrometry (CE-ICPMS). An enzyme (i.e., α-amylase)-assisted water-phase microwave extraction procedure was used to extract four common arsenic species, including dimethylarsinic acid (DMA), monomethylarsonic acid (MMA), arsenite [As(III)], and arsenate [As(V)] from the rice matrices. The addition of the enzyme α-amylase during the extraction process was necessary to reduce the sample viscosity, which subsequently increased the injection volume and enhanced the signal response. o-Arsanilic acid (o-ASA) was added to the sample solution as a mobility marker and internal standard. The obtained repeatability [i.e., relative standard deviation (RSD %)] of the four arsenic analytes of interest was less than 1.23% for elution time and 2.91% for peak area. The detection limits were determined to be 0.15-0.27 ng g(-1). Rice standard reference materials SRM 1568b and CRM 7503-a were used to validate this method. The quantitative concentrations of each organic arsenic and summed inorganic arsenic were found within 5% difference of the certified values of ...Continue Reading

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Citations

Dec 10, 2016·Ecotoxicology and Environmental Safety·Anjing GengXiaoli Zhao
Dec 31, 2016·Applied Spectroscopy·Toni Llorente-MirandesJosé Fermín López-Sánchez
Oct 27, 2016·Electrophoresis·Anna TýčováKarel Klepárník
Jan 13, 2021·Journal of Agricultural and Food Chemistry·Yuhong WangLei Zheng

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