Francisco Pena

TL;DR: In this article, the main applications of ultrasound for pretreatment of solid samples and some liquid samples with a complex matrix (e.g., wastewater) in the context of green analytical chemistry are discussed.

TL;DR: In this work, ultrasound-assisted emulsification microextraction in combination with fibre optics-based cuvetteless UV-vis micro-spectrophotometry has been proposed as a novel method for the determination of formaldehyde in water-based cosmetics such as shampoo, conditioner and shower gel.

TL;DR: In this article, single-drop microextraction (SDME) and sequential injection analysis have been hyphenated for ultratrace metal determination by Electrothermal-Atomic Absorption Spectrometry (ETAAS).

TL;DR: In the area of trace element analysis and speciation, ultraviolet irradiation can provide remarkable advantages for trace-element analysis, since methods for removal of organic matter, decomposition of organic-metal complexes and vapor generation (VG) can be driven by photo-oxidation or photo-reduction processes with total or partial replacement of chemicals employed in conventional approaches.

TL;DR: In this paper, an efficient cup-horn sonoreactor was used as ultrasonic device to accelerate the extraction process of silver and gold at μgg − 1 levels in different environmental samples such as soil, sediment, fly ash and industrial sludge.