Search Results - "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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Deep eutectic solvent in ultrasound-assisted liquid-phase microextraction for determination of vanadium in food and environmental waters by Azevedo Lemos, Valfredo, Bastos Santos, Luana, Santos Assis, Rosivan

“…[Display omitted] •UA-LPME is combined with digital image colorimetry for speciation of vanadium.•The digital image is obtained from a drop of the rich…”
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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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Application of Mixture Design Using Diluted Acid for Extraction of Inorganic Components in Fruits of Casearia fasciculata and Determination by ICP OES: Evaluation by PCA and HCA by Romão, Ivana, Novais, Franciele, Assis, Rosivan, da Silva, Vinnícius, de Jesus, Raildo, Novaes, Cleber, dos Santos, Ana

“…This study is the first to propose the simultaneous quantification of 10 elements in fruits of Casearia fasciculata by inductively coupled plasma optical…”
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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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Green chemistry advances: Integrating digital images and microextraction by Santos, Luana Bastos, Barreto, Jeferson Alves, Coutinho, Joselânio Jesus, Ferreira, Sérgio Luís Costa, Assis, Rosivan Santos, Lemos, Valfredo Azevedo

“…Digital image colorimetry (DIC) is a promising analytical technique for quantifying chemical species. It is accessible, simple, and cost-effective. When…”
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Deep eutectic solvents in liquid-phase microextraction: Contribution to green chemistry by Santos, Luana Bastos, Assis, Rosivan Santos, Barreto, Jeferson Alves, Bezerra, Marcos Almeida, Novaes, Cleber Galvão, Lemos, Valfredo Azevedo

“…In recent years, the search for the principles of green chemistry in analytical methods has grown considerably. In green analytical chemistry, solvents occupy…”
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Sample preparation strategies alternative to mineralization for elemental analysis in foods by spectroanalytical techniques – A review by Assis, Rosivan Santos, Silva, Uneliton Neves, Santos, Luana Bastos, Silva Melo, Anderson, Coutinho, Joselanio Jesus, Cerqueira, Uillian Mozart Ferreira Mata, Lemos, Valfredo Azevedo, Bezerra, Marcos Almeida

“…[Display omitted] •Techniques for sample preparation alternative to mineralization,•Critical discussion of advantages, disadvantages, limitations and…”
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Green chemistry-based strategies for liquid-phase microextraction and determination of mercury species by Assis, Rosivan Santos, Barreto, Jeferson Alves, Santos, Márcio José Silva, Silva, Uneliton Neves, Amazonas, Victor Miranda, Cletche, Clinzen Fona, Bezerra, Marcos Almeida, Lemos, Valfredo Azevedo

“…This review article explores several liquid-phase microextraction (LPME) strategies in sample treatment for determining mercury species in several matrices…”
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