Multivariate optimization of ultrasound-assisted liquid–liquid microextraction based on two solvents for cadmium preconcentration prior to determination by flame atomic absorption spectrometry,Analytical Methods

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Multivariate optimization of ultrasound-assisted liquid–liquid microextraction based on two solvents for cadmium preconcentration prior to determination by flame atomic absorption spectrometry
Analytical Methods ( IF 2.7 ) Pub Date : 2020-12-7 , DOI: 10.1039/d0ay02030c
Vanessa Jesus Ferreira _{1,

2,

3,

4,

5} , Marina Santos de Jesus _{4,

6,

7,

8} , Mayara Costa dos Santos _{4,

6,

7,

8,

9} , Wesley N. Guedes _{4,

10,

11,

12} , Valfredo A. Lemos _{1,

2,

3,

4,

5} , Cleber G. Novaes _{1,

2,

3,

4} , Floriatan Santos Costa _{4,

13,

14,

15} , Clissiane S. Viana Pacheco _{4,

5,

10,

16,

17} , Erik Galvão Paranhos da Silva _{1,

2,

3,

4,

6} , Fábio Alan Carqueija Amorim _{4,

6,

7,

8,

18}

Affiliation

Department of Chemistry and Exact
Universidade Estadual do Sudoeste da Bahia
Jequié
Brazil
Institute of Chemistry
Department of Exact and Technological Sciences
Universidade Estadual de Santa Cruz
Ilhéus
Institute of Chemistry and Biotechnology
Department of Analytical Chemistry
Universidade Estadual Paulista
Araraquara
Department of Chemistry
Universidade Federal do Paraná
Curitiba
Universidade Federal da Bahia
Salvador
Instituto Nacional de Ciência e Tecnologia de Energia e Ambiente

A method based on ultrasound-assisted emulsification liquid–liquid microextraction (USAEME) for cadmium determination by flame atomic absorption spectrometry (FAAS) was developed in this work. USAEME is based on the use of the mixture of 1,2-dichloroethane and trichloroethylene as an acceptor phase, 2-(2-bromo-5-pyridylazo)-5(diethylamino)phenol (Br-PADAP) as a chelating reagent, and ethanol as a dispersive solvent. The composition of the extraction and dispersive solvents, the volume of the extraction solvent, pH, and the sonication time were optimized using the multivariate strategy. The limits of detection and quantification calculated under optimum conditions were, respectively, 0.39 and 1.33 μg L^−1, and the obtained enrichment factor was 21. The accuracy was tested by the analysis of certified reference materials. The method was applied to cadmium determination in bivalve mollusks, water, and urban wastewater from Pontal Bay, Bahia, Brazil. The proposed method is simple, fast, and efficient, and uses small amounts of organic solvents for the determination of cadmium.

中文翻译：

在火焰原子吸收光谱法测定前，基于两种溶剂对镉进行预富集的超声辅助液-液微萃取的多元优化

这项工作开发了一种基于超声辅助乳化液-液微萃取（USAEME）的火焰原子吸收光谱法（FAAS）测定镉的方法。USAEME基于使用1,2-二氯乙烷和三氯乙烯的混合物作为受体相，使用2-（2-溴-5-吡啶基偶氮）-5（二乙基氨基）苯酚（Br-PADAP）作为螯合剂和乙醇作为分散溶剂。提取和分散溶剂的组成，提取溶剂的体积，pH和超声处理时间均使用多元策略进行了优化。在最佳条件下计算出的检出限和定量限分别为0.39和1.33μgL ^-1，富集系数为21。通过对认证参考物质的分析测试了准确性。该方法用于巴西巴伊亚州蓬塔尔湾的双壳类软体动物，水和城市废水中镉的测定。所提出的方法简单，快速，高效，并且使用少量有机溶剂测定镉。

更新日期：2020-12-24

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