Universidade Federal Do Recôncavo da Bahia, Centro de Ciências Exatas e Tecnológicas, Campus Universitário de Cruz Das Almas, (CEP 44380-000), Cruz Das Almas, Bahia, Brazil.
Universidade Federal da Bahia, Instituto de Química, Departamento de Química Analítica, Campus Universitário de Ondina, (CEP 40170-115), Salvador, Bahia, Brazil.
Talanta. 2020 Nov 1;219:121218. doi: 10.1016/j.talanta.2020.121218. Epub 2020 May 29.
A sample pretreatment based on an extraction process by emulsion breaking for multi-element determination in edible oils was developed. The determination of eight trace elements (Al, Ba, Cu, Cr, P, Ni, Ti, and Zn) was carried out by microwave-induced plasma optical emission spectrometry (MIP OES) after the extraction procedure. A D-optimal mixture experimental design was used to obtain the best experimental conditions for the extraction induced by emulsion breaking (EIEB). The proportion of HNO solution, Triton X-100 solution and sample was evaluated in a multivariate manner. The best recovery efficiency was obtained with 1.0 mL of 30% (v/v) HNO, 1.0 mL of 30% (w/v) Triton-X 100 and 3.0 mL of the sample. The precisions, established as the relative standard deviation (RSD, %), were better than 2.5% for all analytes. The developed method was applied to the analysis of commercial vegetable oils with low limits of detection and good precision.
建立了一种基于破乳萃取的样品前处理方法，用于食用油中多种元素的测定。采用微波诱导等离子体光学发射光谱法（MIP OES），在萃取后对八种痕量元素（Al、Ba、Cu、Cr、P、Ni、Ti 和 Zn）进行了测定。采用 D-最优混合实验设计，获得了破乳诱导萃取（EIEB）的最佳实验条件。以多元方式评估了 HNO 溶液、Triton X-100 溶液和样品的比例。采用 1.0 mL 30%（v/v）HNO、1.0 mL 30%（w/v）Triton-X 100 和 3.0 mL 样品，可获得最佳的回收率效率。所有分析物的精密度（以相对标准偏差（RSD，%）表示）均优于 2.5%。该方法应用于商业植物油的分析，具有较低的检出限和良好的精密度。
