Enginyeria Química i Química Analítica: Enviaments recents
Ara mostrant els elements 261-280 de 791
Molecular characteristics of several drugs evaluated from solvent/water partition measurements: Solvation parameters and intramolecular hydrogen bond indicator
A wide set of well-known drugs, most of them included in the Abraham´s reference database, covering a wide variety of chemical structures and therapeutical functionalities were chosen in order to determine some molecular ...
Influence of EfOM on the oxidation of micropollutants by Ozone and UV/H2O2 in secondary effluents
The aim of this work was to study the influence of effluent organic matter (EfOM) on micropollutants removal by ozone and UV/H2O2. To perform the experiments, deionized water and municipal secondary effluents (SE) were ...
Determination of thermodynamic properties for the esterification of levulinic acid with 1-butene
The thermodynamic equilibrium of the liquid phase esterification of levulinic acid (LA) with 1-butene (1B) to obtain sec-butyl levulinate (SBL) was studied. Equilibrium experiments were performed in a batch reactor at 2.5 ...
Use of organic fertilizers in solar photo-Fenton process as potential technology to remove pineapple processing wastewater in Costa Rica
Background: This work studied the use of the organic fertilizers DTPA-Fe and EDDS-Fe as iron chelates for solar driven photo-Fenton process at natural pH. This process was proposed to investigate its performance on removing ...
Retention-pH profiles of acids and bases in hydrophilic interaction liquid chromatography
The high proportion of acetonitrile used in many HILIC mobile phases significantly changes the acid-base properties of pH buffers and analytes foreseen from available data in water. In this paper, the recommended stability ...
Dimethylglyoxime modified screen-printed electrodes for nickel determination
This work reports the development of a dimethylglyoxime (DMG) modified sensor in which the complexing agent was successfully immobilized by drop-casting onto a screen-printed carbon electrode support (SPCE). The experimental ...
Migration of antimony from polyethylene terephthalate used in mineral water bottles.
The influence of storage time and temperature on Sb migration from PET bottles into mineral water was studied in short-term tests lasting up to 15 days and long-term studies lasting up to 220 days. Samples purchased were ...
Evaluación contínua mediante dispositivos móviles en asignaturas de Química Analítica
Se requiere de la introducción de nuevas metodologías que nos permitan garantizar el correcto seguimiento individualizado de la evaluación continua del estudiante y que nos conduzcan a poder realizar una evaluación ...
Antimony nanomaterials modified screen-printed electrodes for the voltammetric determination of metal ions
Exfoliated β-Sb or two dimensional (2D) antimonene-based modified screen-printed electrode (2D Sb-SPCE), prepared by drop-casting of an exfoliated layered β-antimony (2D Sb) suspension, was used for the simultaneous ...
The Effect of Small Cosolutes that Mimic Molecular Crowding Conditions on the Stability of Triplexes Involving Duplex DNA
Triplex stability is studied in crowding conditions using small cosolutes (ethanol, acetonitrile and dimethylsulfoxide) by ultraviolet (UV), circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopies. The ...
Kinetic study of magnesium dissolution using a magnesium oxide industrialby-product
Phosphorus recovery via struvite precipitation in wastewater treatment plants (WWTPs) is a key technology fornutrient recovery. This work investigates the dissolution kinetics of an industrial low-grade magnesium oxide(LG-MgO) ...
Preconcentración por extracción en fase sólida en línea a la electroforesis capilar acoplada a la espectrometría de masas
Los factores más importantes a tener en cuenta cuando se desarrollan nuevas técnicas y métodos de separación son la simplificación, rapidez y coste de los análisis, la reducción de la cantidad de reactivos y muestra ...
Honey fraud detection based on sugar syrup adulterations by HPLC-UV fingerprinting and chemometrics
In recent years, honey-producing sector has faced the increasing presence of adulterated honeys, implying greateconomic losses and questioning the quality of this highly appreciated product by the society. Due to the ...
Assessing sorption of fluoroquinolone antibiotics in soils from a Kdcompilation based on pure organic and mineral components
The presence of fluoroquinolone (FQ) antibiotics in soils may cause a threat to human health due to overexposure and the generation of antibiotic resistance genes. Understanding their sorption behavior in soils is important ...
Accurate determination of the milk protein allergen β-lactoglobulin by on-line aptamer affinity solid-phase extraction capillary electrophoresis-mass spectrometry
An on-line aptamer affinity solid-phase extraction capillary electrophoresis-mass spectrometry (AA-SPE-CE-MS) method was developed to purify, preconcentrate, separate, and characterize the milk allergenic protein β-lactoglobulin ...
Total polyphenol content in food samples and nutraceuticals: antioxidant indices versus high performance liquid chromatography
The total content of polyphenols and the antioxidant capacity have been estimated in various food and nutraceutical samples including cranberry, raspberry, artichoke, grapevine, green tea, coffee, turmeric, and other ...
Adsorption of benzophenone-3 and octocrylene UV filters on polyethylene:analysis by HPLC-MS/MS and voltammetry with screen-printed electrodes
Microplastics (MPs) are persistent pollutants that can adsorb contaminants, facilitating their accumulation inaquatic ecosystems. The presence of UV filters (UVFs) such as benzophenone-3 (BP3) and octocrylene (OC),exacerbates ...
Commercial screen-printed electrodes based on carbon nanomaterials for a fast and cost-effective voltammetric determination of paracetamol, ibuprofen and caffeine in water samples
Carbon screen-printed electrode (SPCE), multi-walled carbon nanotubes modified screen-printed electrode (SPCNTE), carbon nanofibers modified screen-printed electrode (SPCNFE), and graphene modified screen-printed electrode ...
Phenolic Composition, Antioxidant Capacity and Antiproliferative Activity of Ten Exotic Amazonian fruit
The socioeconomic, cultural, therapeutic, and nutritional potential of Amazonian fruits has been limited due to the scarce information about its phytochemical profile. The aim of this study was to determine the total ...
Co-digestion of sewage sludge and food waste in a wastewater treatment plant based on mainstream anaerobic membrane bioreactor technology: A techno-economic evaluation
The implementation of anaerobic membrane bioreactor as mainstream technology would reduce the load of sidestream anaerobic digesters. This research evaluated the techno-economic implications of co-digesting sewage sludge ...
