Extractant
Mostrando 13-24 de 51 artigos, teses e dissertações.
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13. Application of Solvent Demulsification-Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Drop Coupled with High Perfomence Liquid Chromatography in Determination of Sulfonylurea Herbicides in Water and Soil
A method for simultaneous determination of nine sulfonylurea herbicides in water and soil samples with solvent demulsification-dispersive liquid-liquid microextraction based on solidification of floating organic drop coupled with high perfomence liquid chromatography was established. 120 µL of 1-dodecanol as extractant and 400 µL of methanol as dispersing
J. Braz. Chem. Soc.. Publicado em: 2016-10
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14. Oxidative Desulfurization of Gasoline by Ionic Liquids Coupled with Extraction by Organic Solvents
In this work, desulfurization of real fluidized catalytic cracking (FCC) gasoline was investigated in dual steps; first in oxidative desulfurization (ODS) using imidazolium and pyrrolidonium based Brønsted acidic ionic liquids (ILs) as solvent and catalyst and hydrogen peroxide as oxidant. In second step, extractive desulfurization took place using organic
J. Braz. Chem. Soc.. Publicado em: 2016-06
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15. Investigation of Copper Extraction from Aqueous Sulfate Solution in a Rotating Disc Contactor
The extraction of copper from aqueous sulfate solution with new extractant Cupromex-3302 (active substance is the 5-nonylsalicylaldoxime) using a rotating disc contactor (RDC) was investigated. It was observed from batch experiments that the best results were obtained with the initial aqueous pH and concentration of Cupromex-3302 of 1.9 and 10% (v/v) respect
J. Braz. Chem. Soc.. Publicado em: 2016-05
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16. Separation of rare earths by solvent extraction using DEHPA
Abstract This paper presents results or the analysis of process variables for separating light REE and heavy REE, in chloride media, by solvent extraction. DEHPAIsoparaffin was used as the extraction system and the liquor was produced in the laboratory by dissolving REE oxides in HCl to simulate leaching liquor originating from monazitic ores after cerium re
Rem: Rev. Esc. Minas. Publicado em: 2015-12
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17. DISPOSITIVO PARA EXTRAÇÃO LÍQUIDO-LÍQUIDO EM SISTEMAS DE ANÁLISES EM FLUXO
AbstractA device comprising a lab-made chamber with mechanical stirring and computer-controlled solenoid valves is proposed for the mechanization of liquid-liquid extractions. The performance was demonstrated by the extraction of ethanol from biodiesel as a model of the extraction of analytes from organic immiscible samples to an aqueous medium. The volumes
Quím. Nova. Publicado em: 2015-08
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18. Recovery Process Development for the Rare Earths from Permanent Magnet Scraps Leach Liquors
The current study deals with the recovery process development for the rare earths (REs), i.e., dysprosium (Dy) and neodymium (Nd), metals from permanent magnet scraps leach liquors. Its main objective is the recovery of the rare earths (Dy and Nd) from permanent magnet scraps (PMSs). Introdutory experiments were carried out to get leach liquor solution: oxid
J. Braz. Chem. Soc.. Publicado em: 2015-06
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19. VIS-NIR SPECTROMETRY, SOIL PHOSPHATE EXTRACTION METHODS AND INTERACTIONS OF SOIL ATTRIBUTES
The objective of this study was to evaluate the relationships between the spectra in the Vis-NIR range and the soil P concentrations obtained from the PM and Prem extraction methods as well as the effects of these relationships on the construction of models predicting P concentration in Oxisols. Soil samples' spectra and their PM and Prem extraction solution
Quím. Nova. Publicado em: 2015-03
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20. Cadmium phytoavailability in soils and evaluation of extractant effectiveness using an isotope technique
Large areas of land are nowadays contaminated by heavy metals and, it is therefore, important to monitor their levels in soils. Vegetables act as transfer mechanisms of such contaminants from soils to higher levels in the food chain. In this study, we aimed to evaluate the effectiveness of chemical extractants by the L-value method for Cd phytoavailability u
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-10
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21. Alkaline extraction of humic substances from peat applied to organic-mineral fertilizer production
An organic-mineral fertilizer based on humic substances (HSs) and potassium was developed based on the alkaline extraction of HSs from peat. The HSs have interesting properties for use as a fertilizer since they improve the physical and chemical structure of the soil and provide a source of organic carbon which is readily absorbable by the plants, whereas po
Braz. J. Chem. Eng.. Publicado em: 2014-09
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22. A study of parameters affecting the solvent extraction of lactic acid from fermentation broth
Lactic acid has recently been drawing much interest as a raw material for biodegradable polymer. One of the promising technologies for recovery of lactic acid from fermentation broth is reactive liquid - liquid extraction. Equilibrium studies on the reactive extraction of lactic acid with trioctylamine (TOA) in various organic phases and its re-extraction in
Braz. J. Chem. Eng.. Publicado em: 2014-09
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23. Determination of triamterene in human plasma and urine after its cloud point extraction
A new analytical approach was developed involving cloud point extraction (CPE) and spectrofluorimetric determination of triamterene (TM) in biological fluids. A urine or plasma sample was prepared and adjusted to pH 7, then TM was quickly extracted using CPE, using 0.05% (w/v) of Triton X-114 as the extractant. The main factors that affected the extraction e
Quím. Nova. Publicado em: 2014
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24. Influence of the extractant on the complexing capacity of humic substances from peat for macro and micronutrients using continuous flow: agricultural application and environmental impacts
O objetivo do presente trabalho foi otimizar o procedimento para extração de substâncias húmicas de turfa, utilizando fluxo contínuo, com diferentes extratores (NaOH, KOH e Na4P2O7). A influência do extrator na capacidade de complexação das substâncias húmicas por macro e micronutrientes também foi investigada. Os resultados mostraram que a extra�
J. Braz. Chem. Soc.. Publicado em: 2013-12