Laboratory of Applied Chemistry Study, Department of Analytical Chemistry and Physical Chemistry, Science Center, Pici Campus, Federal University of Ceara, 60455-760 Fortaleza, CE, Brazil.
Grupo de Química de Materiais Avançados (GQMat), Department of Analytical Chemistry and Physical-Chemistry, Science Center, Pici Campus, Federal University of Ceara, 60455-760 Fortaleza, CE, Brazil; Instituto Federal de Educação, Ciência e Tecnologia do Ceará (IFCE) - Campus Camocim, 62400-000 Camocim, CE, Brazil.
Food Chem. 2023 Jun 30;412:135461. doi: 10.1016/j.foodchem.2023.135461. Epub 2023 Jan 16.
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 µg kg, respectively) of the proposed method were satisfactory. The rice samples had tAs contents between 0.090 and 0.295 mg kg and iAs mass fractions between 0.055 and 0.109 mg kg.
研究开发了一种利用电感耦合等离子体发射光谱法（ICP OES）定量分析大米中无机砷（iAs）的分析方法。采用一种有机磷化合物修饰的铁纳米粒子作为 MSPE 法从植物基质中萃取 iAs 的固相。MSPE 程序在 pH 值为 4.0 的 4 mL 缓冲溶液中进行，使用 20 mg 纳米材料，提取时间为 15 分钟。通过使用消解罐溶解样品后，也可以使用相同的 MSPE 程序来定量测定总砷（tAs）。通过使用 NIST 1568b CRM（分别为 97%和 101%的回收率）来验证 tAs 和 iAs 定量的准确性。该方法的精密度（RSD < 15%）和检出限和定量限（分别为 1.08 和 3.70 µg kg）令人满意。大米样品中的 tAs 含量在 0.090 到 0.295 mg kg 之间，iAs 质量分数在 0.055 到 0.109 mg kg 之间。
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