Journal
FOOD CHEMISTRY
Volume 412, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2023.135461
Keywords
Rice; Arsenic speciation; Nanomaterials; Nonchromatographic methods; ICP OES; Magnetic solid phase extraction
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An alternative analytical method using ICP OES was developed for quantifying inorganic arsenic (iAs) in rice. Iron nanoparticles modified with an organophosphorus compound were used to extract iAs from the plant matrix. The proposed method demonstrated satisfactory precision, LOD, and LOQ, with tAs contents between 0.090 and 0.295 mg kg-1 and iAs mass fractions between 0.055 and 0.109 mg kg-1 in rice samples.
An alternative analytical method was developed for the quantification of inorganic arsenic (iAs) in rice by ICP OES. Iron nanoparticles modified with an organophosphorus compound were used as the solid phase for MSPE of iAs from the plant matrix. The MSPE procedure was performed using 4 mL of a buffer solution with pH 4.0, 20 mg of the nanomaterial, and a 15-min extraction time. The total As (tAs) by ICP OES was also quantified using the same MSPE procedure after solubilization of the samples by a block digester. The accuracy of tAs and iAs quantification was verified using CRM NIST 1568b (97 % and 101 % recovery, respectively). The precision (RSD < 15 %) and LOD and LOQ (1.08 and 3.70 mu g kg- 1, respectively) of the proposed method were satisfactory. The rice samples had tAs contents between 0.090 and 0.295 mg kg- 1 and iAs mass fractions between 0.055 and 0.109 mg kg- 1.
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