Enginyeria Química i Química Analítica: Envíos recientes
Mostrando ítems 321-340 de 791
Examination of competitive lanthanide sorption onto smectites and its significance in the management of radioactive waste
The competitive effect of La and Lu (analogues of radionuclides appearing in radioactive waste) in the sorption in four smectites was examined. Sorption and desorption distribution coefficients (Kd; Kd,des), and desorption ...
Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents
The use of low-cost inorganic sorbents as a new sustainable strategy to enhance the valorization of nutrients (N-P-K), from the urban water cycle (e.g., side streams from sewage sludge anaerobic digestion), in agriculture ...
An elegant technology for ultrasensitive impedimetric and voltammetric determination of cholestanol based on a novel molecularly imprinted electrochemical sensor
In this work, a novel molecularly imprinted electrochemical sensor (MIES) has been fabricated based on electropolymerization of a molecularly imprinted polymer (MIP) onto a glassy carbon electrode (GCE) modified with ...
Solid-phase extraction using molecularly imprinted polymer for selective extraction of natural and syntetic estrogens from aqueous samples
A method is proposed for the clean-up and preconcentration of natural and synthetic estrogens from aqueous samples employing molecularly imprinted polymer (MIP) as selective sorbent for solid-phase extraction (SPE). The ...
Accuracy of a method based on atomic absorption spectrometry to determine inorganic arsenic in food: outcome of the collaborative trial IMEP-41
A collaborative trial was conducted to determine the performance characteristics of an analytical method for the quantification of inorganic arsenic (iAs) in food. The method is based on (i) solubilisation of the protein ...
Rheology of Water-in-water emulsions: Caseinate-pectin and caseinatealginate systems
Conventional models developed for oil-water emulsions do not fit viscosity of caseinate-pectin and caseinatealginate water-in water emulsions, which is always lower than predicted, except for high viscosities of disperse ...
Anaerobic co-digestion effluent as substrate for chlorella vulgaris and scenedesmus obliquus cultivation
Anaerobic digestate supernatant can be used as a nutrient source for microalgae cultivation, thus integrating phytoremediation processes with high value products storage in microalgae biomass. Microalgae are able to use ...
Equilibrium solubility measurement of ionizable drugs-consensus recommendations for improving data quality
This commentary addresses data quality in equilibrium solubility measurement in aqueous solution. Broadly discussed is the 'gold standard' shake-flask (SF) method used to measure equilibrium solubility of ionizable drug-like ...
La clase inversa como estrategia de enseñanza-aprendizaje en modalidad virtual en la asignatura de Química Analítica.
Este trabajo describe la implementación de las estrategias de clase inversa en la asignatura de Química Analítica de los Grados de Química, Farmacia e Ingeniería Química de la Universitat de Barcelona (UB) como metodología ...
Process performance and precipitate quality of phosphorus recovery by struvite precipitation in a fluidized bed reactor using a MgO industrial by-product
Phosphorus recovery through struvite precipitation has gained interest due to the potential use of struvite as a fertiliser, with fluidised bed reactors being a popular technology for carrying out the process. Struvite ...
Study of the interaction of the palmatine alkaloid with hybrid G-quadruplex/duplex and i-motif/duplex DNA structures
There is an increasing interest in the study of guanine or cytosine-rich sequences that may fold into G-quadruplex (G4) or i-motif (iM) structures showing a short hairpin (or stem-loop) stabilized by Watson-Crick base ...
Determination of phenolic compounds in paprika by ultrahigh performance liquid chromatography-tandem mass spectrometry: application to product designation of origin authentication by chemometrics
A UHPLC-ESI-MS/MS method was developed for the determination of 36 phenolic compounds in paprika. The proposed method showed good method performance with limits of quantitation between 0.03 - 50 µg/L for 16 compounds, and ...
Solubility-pH profiles of a free base and its salt: sibutramine as a case study
In the present study the solubility-pH profiles of sibutramine free base and its hydrochloride salt were determined in the pH range between 2.0 and 9.5 by means of the recommended shake-flask method, and the solids collected ...
Liquid Chromatography-High-resolution Mass Spectrometry (LC-HRMS) Fingerprinting and Chemometrics for Coffee Classification and Authentication
Nowadays, the quality of natural products is an issue of great interest in our society due to the increase in adulteration cases in recent decades. Coffee, one of the most popular beverages worldwide, is a food product ...
Determination of capsaicinoids and carotenoids for the characterization and geographical origin authentication of paprika by UHPLC-APCI- HRMS
The production area mislabeling of a food product is considered a fraudulent practice worldwide. In this work, a method that uses ultra-high-performance liquid chromatography coupled to high-resolution mass spectrometry ...
Gamma distribution function to understand anaerobic digestion kinetics: Kinetic constants are not constant
The Gamma model is a novel approach to characterise the complex degradation dynamics taking place during anaerobic digestion. This three parameters model results from combining the first-order kinetic model and the Gamma ...
Anaerobic membrane bioreactor performance at different wastewater pre-concentration factors: An experimental and economic study
This research evaluated the performance of a lab-scale anaerobic membrane bioreactor (AnMBR) treating municipal sewage pre-concentrated by forward osmosis (FO). The organic loading rate (OLR) and sodium concentrations of ...
Phosphorus recovery via vivianite precipitation in anaerobic digestion and fermentation processes: A comprehensive review
Phosphorus recovery is gaining importance due to its supply risk. Wastewater treatment plants (WWTPs) are sinks of phosphorus from municipal and industrial discharges, making them ideal sites for recovery. In WWTPs, the ...
Determination of dyes in candies in an analytical chemistry laboratory subject
The use of everyday life samples in laboratory subjects enhances motivation among students and, therefore, improves their learning outcomes. Candies are a common sample in students’ everyday life, which makes their dye ...
Photocatalytic degradation of sulfamethoxazole using TiO2 in simulated seawater: evidence for direct formation of reactive halogen species and halogenated by-products
Combined sewer overflows (CSO), generated during the wet weather flow from the combination of the inflow and stormwater runoff in sewer system, result in an overflow of untreated wastewater from sewer system, which might ...
