Scholarlink

<p>The present work addresses the development of a green analytical method based on slurry sampling to determine Ca, Fe, and Zn in rice. Multivariate optimization techniques (two-level fractional factorial design and Doehlert design) were used to find the experimental conditions that offer the best characteristics for the method. The slurry was made with 0.25&#xa0;g of the sample in a liquid phase composed of 0.7&#xa0;mol L<sup>−1</sup> HNO<sub>3</sub> and 0.31% Triton X-100 and submitted to an ultrasound bath for 7.5&#xa0;min. The method has presented analytical characteristics, such as limit of quantification (4.9, 1.6, and 0.22&#xa0;mg&#xa0;kg<sup>−1</sup>), precision expressed as repeatability (4.4, 3.6, and 2.2%, for <i>N</i> = 7) respectively for Ca, Fe, and Zn, suitable for the determination of these metals in rice samples. Additionally, accuracy has been assessed by spike tests (obtaining recoveries between 90 and 108%) and comparing the values obtained by the new methodology with the standard method of acid decomposition in a digester block. The paired <i>t</i>-test revealed that there are no statistically significant differences (95% confidence level) between the slurry sampling method and the method adopted as standard.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Development of an Ultrasound-Assisted Slurry Sampling–Based Method for Determination of Metals in Rice Samples Using FAAS

  • 期刊论文

  • 发表日期：

    2025年8月27日

查看全文
  • Lays Pereira do Nascimento,
  • Laís Silva Gomes,
  • Cleber Galvão Novaes,
  • Sulene Alves Araújo,
  • Anderson Santos Souza,
  • Geovane Silva Oliveira,
  • Baraquizio Braga do Nascimento Junior,
  • Marcos Almeida Bezerra

摘要

The present work addresses the development of a green analytical method based on slurry sampling to determine Ca, Fe, and Zn in rice. Multivariate optimization techniques (two-level fractional factorial design and Doehlert design) were used to find the experimental conditions that offer the best characteristics for the method. The slurry was made with 0.25 g of the sample in a liquid phase composed of 0.7 mol L−1 HNO3 and 0.31% Triton X-100 and submitted to an ultrasound bath for 7.5 min. The method has presented analytical characteristics, such as limit of quantification (4.9, 1.6, and 0.22 mg kg−1), precision expressed as repeatability (4.4, 3.6, and 2.2%, for N = 7) respectively for Ca, Fe, and Zn, suitable for the determination of these metals in rice samples. Additionally, accuracy has been assessed by spike tests (obtaining recoveries between 90 and 108%) and comparing the values obtained by the new methodology with the standard method of acid decomposition in a digester block. The paired t-test revealed that there are no statistically significant differences (95% confidence level) between the slurry sampling method and the method adopted as standard.