Enginyeria Química i Química Analítica: Enviaments recents
Ara mostrant els elements 181-200 de 790
An FIA-MS Method for Rapid Coffee Adulteration Detection: A Comparative Study with a Non-Targeted LC-MS Approach
Coffee adulteration is a growing concern in the food industry due to economic and quality implications. This study evaluates a rapid, non-targeted fingerprinting method based on flow injection analysis–mass spectrometry ...
Selenocystine modified screen-printed carbon electrode as an alternative sensor for the voltammetric determination of metal ions
Heavy metals are present in the environment from both natural and anthropogenic sources. Their bioaccumulation and persistence constitutes a serious threat to human health, demanding suitable methods for heavy metal ...
Identification of intermediates, acute toxicity removal and kinetics investigation to the Ametryn treatment by direct photolysis (UV254), UV254/H2O2, Fenton and photo-Fenton processes
This paper reports the degradation of 10 mg L−1 Ametryn solution with different advanced oxidation processes and by ultraviolet (UV254) irradiation alone with the main objective of reducing acute toxicity and increase ...
Determination of polyphenols in spanish wines by capillary zone electrophoresis. Application to wine characterization by using chemometrics
A capillary zone electrophoresis method for the simultaneous determination of twenty polyphenols in wine was developed. The separation was performed using fused-silica capillaries of 75 µm I.D. and a 30 mM sodium tretraborate ...
Potential Use of Precipitates from Acid Mine Drainage (AMD) as Arsenic Adsorbents
The role of precipitates from acid mine drainage (AMD) in arsenic removal in water is a process to be investigated in more detail. The present study is focused on the potential use of two AMD precipitates using oxidation ...
Desorption electrospray ionization-high resolution mass spectrometry for the screening of veterinary drugs in cross contaminated feddstuffs
In this study, a desorption electrospray ionization-high resolution mass spectrometry (DESI-HRMS) screening method was developed for fast identification of veterinary drugs in cross-contaminated feedstuffs. The reliable ...
Analysis of C60-fullerene fullerene derivatives and pristine fullerenes in environmental samples by ultrahigh performance liquid chromatography-atmospheric pressure photoionization-mass spectrometry
In this work, a method is proposed for the simultaneous analysis of several pristine fullerenes (C60, C70, C76, C78, and C84) and three C60-fullerene derivatives (N-methyl fulleropyrrolidine, [6,6]-Phenyl C61 butyric acid ...
Suspect and target screening of natural toxins in the Ter River catchment area in NE Spain and prioritisation by their toxicity
This study presents the application of a suspect screening approach to screen a wide range of natural toxins including mycotoxins, bacterial toxins, and plant toxins in surface waters. The method is based on a generic ...
Techno-economic analysis of forward osmosis pre-concentration before an anaerobic membrane bioreactor: Impact of draw solute and membrane material
This research investigated the impact of draw solute and membrane material on the economic balance of a forward osmosis (FO) system pre-concentrating municipal sewage prior to an anaerobic membrane bioreactor (AnMBR). Eight ...
Shear thinning and thixotropy of HMHEC and HEC water solutions
Steady state viscosity and thixotropy of hydrophobically modified hydroxyethyl cellulose HMHEC and nonassociative cellulose water solutions are studied. Although all the samples are shear thinning, only the HMHEC is ...
Coexistence of Two Kinds of Fluorinated Hydrogenated Micelles as Building Blocks for the Design of Bimodal Mesoporous Silica with Two Ordered Mesopore Networks
A simple and effective route has been developed for the synthesis of bimodal (3.6 and 9.4 nm) mesoporous silica materials that have two ordered interconnected pore networks. Mesostructures have been prepared through the ...
Anodic stripping voltammetry with the hanging mercury drop electrode for trace metal detection in soil samples
The widely spread use of the hanging mercury drop electrode (HMDE) for multi-ion analysis is primarily ascribed to the following reasons: (i) excellent reproducibility owing to the easy renewal of the electrode surface ...
Kinetics of 1-hexanol etherification on Amberlyst 70
The kinetics of the liquid-phase etherification of 1-hexanol to di-n-ethyl ether and water on the ion-exchange resin Amberlyst 70 in the temperature range 423-463 K is studied. The strong inhibition effect of water is ...
Formación competencial de los estudiantes de la Facultad de Química de la Universidad de Barcelona mediante la realización de auditorías internas
Se ha trabajado la formación competencial de los estudiantes de la Facultad de Química de la Universidad de Barcelona (UB) mediante su participación en auditorías a diferentes laboratorios de prácticas y diferentes tipos ...
Advances in anaerobic membrane bioreactor technology for municipal wastewater treatment: A 2020 updated review
The application of anaerobic membrane bioreactors (AnMBR) for mainstream municipal sewage treatment is almost ready for full-scale implementation. However, some challenges still need to be addressed to make AnMBR technically ...
Polymeric monolithic microcartridges with gold nanoparticles for the analysis of protein biomarkers by on-line solid-phase extraction capillary electrophoresis-mass spectrometry
In this study, polymeric monoliths with gold nanoparticles (AuNP@monolith) were investigated as microcartridges for the analysis of protein biomarkers by on-line solid-phase extraction capillary electrophoresis-mass ...
State-of-the-art in fast liquid chromatography-mass spectrometry for bioanalytical applications
There is an increasing need of new bio-analytical methodologies with enough sensitivity, robustness and resolution to cope with the analysis of a large number of analytes in complex matrices in short analysis time. For ...
Evaluation of common supermarket products as positive controls in biochemical methane potential (BMP) tests
Biochemical methane potential (BMP) tests are commonly applied to evaluate the recoverable amount of methane from a substrate. Standardized protocols require inclusion of a positive control with a known BMP to check the ...
Integration of membrane processes for the recovery and separation of polyphenols from winery and olive mill wastes using green solvent-based processing
Winery and olive mill industries generate large amounts of wastes causing important environmental problems. The main aim of this work is the evaluation of different membrane separation processes like microfiltration, ...
El sistema de gestión de la calidad en la Facultad de Química de la Universitat de Barcelona
El Real Decreto 1393/2007 obliga a que todos los estudios de grado tengan un sistema de garantía de la calidad. En esta línea, la Facultad de Química de la Universitat de Barcelona ha creado su Sistema de Gestión de la ...
