Analytical evaluation of a cup-horn sonoreactor used for ultrasound-assisted extraction of trace metals from troublesome matrices |
| |
Authors: | Inmaculada De La Calle Noelia CabaleiroIsela Lavilla Carlos Bendicho |
| |
Institution: | Departamento de Química Analítica y Alimentaria, Área de Química Analítica, Facultad de Química, Universidad de Vigo, Campus As Lagoas-Marcosende s/n, 36310 Vigo, Spain |
| |
Abstract: | In this work, a sample preparation method based on ultrasound-assisted extraction of trace metals from a variety of biological and environmental matrices using a cup-horn sonoreactor is described. Diluted acids (HNO3, HCl and HF) and oxidants (H2O2) were tried for extraction, the extracts being directly analyzed by electrothermal-atomic absorption spectrometry. The cup-horn sonoreactor combines the advantages of probe and bath sonicators, allowing a variety of conditions to be used for metal extraction from troublesome matrices. This system facilitates the use of HF to destroy the silicate lattice, application of simultaneous treatments of up to six samples and short treatment times. Quantitative metal recoveries are achieved from different matrices (animal and vegetal tissues, soil, sediment, fly ash, sewage sludge) under a set of extraction conditions ranging from the use of 3 min sonication time and 3% volume/volume HNO3 for some animal tissues to 40 min sonication time along with 5% volume/volume HNO3 + 20% volume/volume HF for sediment. Vegetal matter required the use of 5% volume/volume HNO3 + 5% volume/volume HF for extraction of some elements. |
| |
Keywords: | Ultrasound-assisted extraction Cup-horn sonoreactor Trace metals Environmental and biological samples Electrothermal-AAS |
本文献已被 ScienceDirect 等数据库收录! |
|