Search Results - "dos Santos de Assis, Rosivan"

Switchable-hydrophilicity solvent-based liquid-phase microextraction in an on-line system: Cobalt determination in food and water samples by Santos, Luana Bastos, Assis, Rosivan dos Santos de, Silva, Uneliton Neves, Lemos, Valfredo Azevedo

“…An on-line system employing switchable-hydrophilicity solvent-based liquid-phase microextraction (SHS-LPME) is described in this work. The method is based on…”
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A novel strategy based on in-syringe dispersive liquid-liquid microextraction for the determination of nickel in chocolate samples by Barreto, Jeferson Alves, dos Santos de Assis, Rosivan, Cassella, Ricardo Jorgensen, Lemos, Valfredo Azevedo

“…In this work, a novel approach was developed to perform dispersive liquid–liquid microextraction using a rapid pressure variation to disperse the extraction…”
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Pressure variation in-syringe dispersive liquid-liquid microextraction associated with digital image colorimetry: Determination of cobalt in food samples by Barreto, Jeferson Alves, dos Santos de Assis, Rosivan, Santos, Luana Bastos, Cassella, Ricardo Jorgensen, Lemos, Valfredo Azevedo

“…•PV-IS-DLLME was combined with digital image colorimetry a for the first time.•The digital image is obtained directly from the enriched phase.•Optimization…”
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Solid-Phase Extraction and Detection by Digital Image Directly in the Sorbent: Determination of Nickel in Environmental Samples by Santos, Luana Bastos, Barreto, Jeferson Alves, dos Santos de Assis, Rosivan, de Souza, Cheilane Tavares, Ferreira, Sérgio Luís Costa, Novaes, Cleber Galvão, Lemos, Valfredo Azevedo

“…Recently, analytical procedures based on computer vision related to the colorimetric analysis of digital images have been described in the scientific…”
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In-syringe dispersive liquid-liquid microextraction by Lemos, Valfredo Azevedo, Barreto, Jeferson Alves, Santos, Luana Bastos, de Assis, Rosivan dos Santos, Novaes, Cleber Galvão, Cassella, Ricardo J.

“…Dispersive liquid-liquid microextraction (DLLME) has recently been widely used in the separation and preconcentration of various chemical species. Among the…”
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