Pre-concentration
Pre-concentration of nitrosamines from aqueous samples by SPE and MEKC.
... PRE-CONCENTRATION OF NITROSAMINES FROM AQUEOUS SAMPLES BY SPE AND MEKC. This paper describes the development of a methodology for solid phase extraction (SPE) and pre-concentration of ...
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REPOSITORIO INSTITUCIONAL DA UFOP: Use of Al2O3 in an automated on-line pre-concentration system for determination of cadmium(II) by FAAS.
... on-line pre-concentration system, were eluent flow rate, sample flow rate, eluent concentration and sample ...the pre-concentration ...the pre-concentration ...
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Simultaneous Determination of Pb and Cd in Seafood by ICP OES with On-Line Pre-Concentration by Solid Phase Extraction with Amberlite XAD-4 after Complex Formation with DDTP
... natura. The determination of Cd and/or Pb in the fish and shrimp has been successfully carried out by inductively coupled plasma emission spectrometry (ICP OES) (Heu et al. 2003; Ersoy and Çelik 2010; Morgano et al. ...
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DEVELOPMENT OF A SYSTEM FOR CD PRE CONCENTRATION ON XAD-4 RESIN MODIFIED WITH FENILFLUORONA AND DETERMINATION BY ATOMIC ABSORPTION SPECTROMETRY.
... Cd PRE CONCENTRATION ON XAD-4 RESIN MODIFIED WITH FENILFLUORONA AND DETERMINATION BY ATOMIC ABSORPTION ...on-line pre concentration of cadmium onto a commercial polystyrene divinil benzene ...
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Cassava root husks as a sorbent material for the uptake and pre-concentration of cadmium(II) from aqueous media
... experimental pre-concentration factor for Cd(II) obtained was 43-fold, what implies that the material recovered 86% of the metal content from the ...the pre-concentration factor, this method ...
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Determination of Cu, Ni and Pb in Aqueous Medium by FAAS after Pre-Concentration on 2-Aminothiazole Modified Silica Gel
... The pre-concentration factors calculated in this conditions were 52, 50 and 47, for Cu(II), Ni(II) and Pb(II), ...the pre- concentration factor and the added and eluted volumes can occur due ...
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Extraction and pre-concentration of volatile organic compounds by membrane permeation for chromatography analysis.
... EXTRACTION AND PRE-CONCENTRATION OF VOLATILE ORGANIC COMPOUNDS BY MEMBRANE PERMEATION FOR CHROMATOGRAPHY ANALYSIS. This work discusses sample preparation processes for gas chromatography (GC) based on the ...
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Determination of ΣDDT and PCBs in the seawater by pre-concentration method in polymerical resins.
... A resina, previamente extraída e tes- tada para garantir a ausência de conta- minantes, deve ser adicionada numa sus- pensão em água livre de orgânicos.. A medidada [r] ...
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A method for analysis of vanillic acid in polar ice cores
... using pre- concentration, derivatization, and gas chromatography–mass spectrometry (GC-MS), similar to techniques used for the analysis of biomass burning aerosols (Nolte et ...
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J. Braz. Chem. Soc. vol.27 número10
... for pre-concentration and separation of REEs as a group from different matrices before ...and pre-concentration of REEs, solid phase extraction (SPE) in off-line/on-line mode 19-25 has been ...
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J. Braz. Chem. Soc. vol.21 número3
... The pre-concentration of uranium (VI) using the ion-imprinted cross-linked chitosan resin via solid phase extraction was ...developed pre- concentration method was tested by analyzing one ...
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J. Braz. Chem. Soc. vol.25 número2
... water and waste water samples. Two spiked experiments for each real water sample were carried out according to the above mentioned procedure. The recovery results are shown in Table 3. The values of recoveries have ...
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J. Braz. Chem. Soc. vol.13 número5
... Separation and Pre-concentration of Cadmium, Copper, Lead, Nickel and Zinc by Solid-Liquid Extraction of their Cocrystallized Naphthalene Dithizone Chelate in Saline Matrices. Antônio C[r] ...
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J. Braz. Chem. Soc. vol.13 número5
... proposed pre-concentration procedure was applied and dithizone concentration was tested within the range ...minimum concentration of 1% m/v ...the concentration of 1% m/v ...
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Magnetic Solid-Phase Extraction Combined with Dispersive Liquid-Liquid Microextraction Followed by HPLC for Determination of Four Aromatic Amines Released from Azo Dyes in Paper Samples
... for pre-concentration of four primary aromatic amines (PAAs) released from azo dyes in paper samples prior to high performance liquid chromatography ...
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J. Braz. Chem. Soc. vol.26 número10
... and pre-concentration of two nitrophenols in water ...salt concentration were ...analyte concentration in the collected phase to the analyte concentration in the aqueous sample, where ...
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An Electrochemical Sensor Based on Nanostructured Hollandite-type Manganese Oxide for Detection of Potassium Ions
... The dependence of anodic peak current of the sensor with the pre-concentration was also investigated. The voltammetric responses of the sensor were realized in a solution containing 4.8 × 10 −4 mol L −1 of ...
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J. Braz. Chem. Soc. vol.22 número4
... The electrochemical behavior of luconazole showed an irreversible oxidation process, with the electrochemical - chemical mechanism being highly dependent on the electrode material. Adsorption of reagent at positive ...
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J. Braz. Chem. Soc. vol.27 número4
... Later, to check the evolution of the hourly concentrations, 12 samples were collected during the period from 6:00 a.m. to 6:00 p.m. on January 3, 2012, at the Maracanã Campus of the Rio de Janeiro State University, where ...
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Mat. Res. vol.20 número1
... the pre-mix solution as the function of monomer content, molar concentration of AM, molar concentration of MBAM, weight ratio initiator to monomers (AM+MBAM), volume fraction of TiC and temperature, ...
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