Search Results - "Cassella, Ricardo Jorgensen"

Development of a non-destructive method for determining protein nitrogen in a yellow fever vaccine by near infrared spectroscopy and multivariate calibration by Dabkiewicz, Vanessa Emídio, de Mello Pereira Abrantes, Shirley, Cassella, Ricardo Jorgensen

“…Near infrared spectroscopy (NIR) with diffuse reflectance associated to multivariate calibration has as main advantage the replacement of the physical…”
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Spectrophotometric determination of rosuvastatin in pharmaceutical formulations using quinalizarin by Lima, Monica Força, Cassella, Ricardo Jorgensen, Pacheco, Wagner Felippe

“…This work presents the development of a methodology based on the formation of a charge transfer complex between quinalizarin and rosuvastatin, allowing for the…”
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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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Polyurethane foam as a sorbent for continuous flow analysis: Preconcentration and spectrophotometric determination of zinc in biological materials by de Jesus, Djane Santiago, Cassella, Ricardo Jorgensen, Ferreira, Sérgio Luis Costa, Costa, Antonio Celso Spinolla, de Carvalho, Marcelo Souza, Santelli, Ricardo Erthal

“…A simple and accurate procedure was developed to preconcentrate and determine zinc in biological matrices. A polyurethane foam (PUF) minicolumn was used for…”
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An on-line solid phase extraction system using polyurethane foam for the spectrophotometric determination of nickel in silicates and alloys by Ferreira, Sérgio Luis Costa, de Jesus, Djane Santiago, Cassella, Ricardo Jorgensen, Costa, Antonio Celso Spinola, de Carvalho, Marcelo Souza, Santelli, Ricardo Erthal

“…The present paper describes the use of a solid phase extraction system using a polyurethane foam (PUF) minicolumn, in order to separate nickel from…”
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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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Multi-energy calibration and induced plasma optical emission spectrometry (MEC-MIP OES) as an alternative method for the multi-elemental determination of essential elements in cocoa by Santos, Thiago Silva, dos Santos, Edmilson Arruda, de Araújo, João Victor Soares, Jadán-Piedra, Carlos, Cassella, Ricardo Jorgensen, Duyck, Christiane, Peixoto, Rafaella Regina Alves

“…The challenge of combining MEC-MIP OES arises from the limited number of emission lines available in this analytical technique. For the MEC-MIP OES…”
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Polycyclic aromatic hydrocarbons in bays of the Rio de Janeiro state coast, SE - Brazil: Effects on catfishes by Freire, Marina Moreira, Amorim, Lidia Maria Fonte, Buch, Andressa Cristhy, Gonçalves, Aline Domingos, Sella, Silvia Maria, Cassella, Ricardo Jorgensen, Moreira, Josino Costa, Silva-Filho, Emmanoel Vieira

“…The Brazilian coast of the Rio de Janeiro State has bays of great economic, ecological and social importance. However, these ecosystems have been suffering…”
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A simple analytical method for determining inorganic anions and formate in virgin olive oils by capillary electrophoresis with capacitively coupled contactless conductivity detection by Travassos Lemos, Maria Augusta, Cassella, Ricardo Jorgensen, de Jesus, Dosil Pereira

“…This paper describes a novel and simple method for determining chloride, nitrate, sulfate, fluoride, and formate in virgin olive oil (VOO) by capillary…”
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Multivariate technique for optimization of digestion procedure by focussed microwave system for determination of Mn, Zn and Fe in food samples using FAAS by Santelli, Ricardo Erthal, Bezerra, Marcos de Almeida, de SantAna, Otoniel Domingos, Cassella, Ricardo Jorgensen, Ferreira, Sérgio Luis Costa

“…This article describes the development by response surface methodology (RSM) of a procedure for iron, zinc and manganese determination by flame atomic…”
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Removal of Malachite Green from Aqueous Medium Employing Polyurethane Foam as Adsorbent and Sodium Dodecylsulfate as Carrier by Leite, Breno Tenório, Robaina, Nicolle Figueira, dos Reis, Luis Gustavo Teixeira, Pereira Netto, Annibal Duarte, Cassella, Ricardo Jorgensen

“…The present work describes a detailed study about the adsorption of malachite green (MG) by a polyether-type polyurethane foam (PUF) using sodium…”
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Flow injection determination of cobalt after its sorption onto polyurethane foam loaded with 2-(2-thiazolylazo)- p-cresol (TAC) by Cassella, Ricardo Jorgensen, Salim, Veronica A., Jesuı́no, Luciene S., Santelli, Ricardo E., Ferreira, Sérgio L.C., de Carvalho, Marcelo S.

“…This paper reports the development of a new methodology for determination of cobalt in water samples by using a flow injection system with loaded PUF as solid…”
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Letter to the Editor by Ferreira, Sérgio Luis Costa, Santelli, Ricardo Erthal, de Aquino Neto, Francisco Radler, Nóbrega, Joaquim Araújo, Cassella, Ricardo Jorgensen

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Flow injection-FTIR determination of dithiocarbamate pesticides by Cassella, A R, Cassella, R J, Garrigues, S, Santelli, R E, de Campos, R C, de la Guardia, M

“…A flow injection Fourier transform infrared spectrometric procedure has been developed for the determination the dithiocarbamate pesticides Ziram and Thiram in…”
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Spectrophotometric determination of carbaryl by on-line elution after its preconcentration onto polyurethane foam by Jorgensen Cassella, Ricardo, Garrigues, Salvador, Santelli, Ricardo E, de la Guardia, Miguel

“…An analytical methodology has been developed for the UV-spectrophotometric determination of carbaryl in waters after its preconcentration onto a polyether type…”
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On Line Dissolution of ZnS For Sulfide Determination in Stabilized Water Samples with Zinc Acetate, Using Spectrophotometry by Methylene Blue Method by Cassella1, Ricardo Jorgensen, de Oliveira1, Leandra Guimarães, Santelli, Ricardo Erthal

“…Stabilization of sulfide as zinc sulfide is a strategy widely used in batch analysis of this ion in water. A FIA/spectrophotometry system to determine sulfide…”
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Determination of Total Fluoride in Oral Products by Using of Potentiometry With Ion Selective Electrode: A Critical Study by Cassella, Ricardo Jorgensen, Filho, Hiram da C. Araújo, Júnior, Ademário I. da Silva, Cruz, Maria B., Campos, Monica D.

“…In this work, a critical study of the determination of fluoride in oral products with an ion selective electrode was performed. The influence of the type of…”
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