Browsing Articles publicats (Química) by Title
Now showing items 90-109 of 313
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Determination of free metal ion concentrations with AGNES in low ionic strength media
(Elsevier, 2013-01-15)The determination of free metal ion concentrations of heavy metals, like Zn2+ or Cd2+, with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) requires an adequate selection of parameters such as deposition ... -
Determination of free Zn2+ concentration in synthetic and natural samples with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) and DMT (Donnan Membrane Technique)
(Elsevier, 2012-04-01)The determination of free Zn2+ ion concentration is a key in the study of environmental systems like river water and soils, due to its impact on bioavailability and toxicity. AGNES (Absence of Gradients and Nernstian ... -
Determination of the complexing capacity of synthetic and real wine for Zn using Absence of Gradients and Nerstian Equilibrium Stripping technique
(American Chemical Society, 2013-02-06)The complexing capacity of synthetic (0.011 M tartrate in 13.5% ethanol) and real wine (Raimat Abadia) in titrations with added total Zn concentrations up to 0.03 M has been determined following the free Zn concentrations ... -
Determination of the free metal Ion concentration using AGNES Implemented with environmentally friendly bismuth film electrodes
(American Chemical Society, 2015-06-16)Ex-situ plated Bi film electrodes (Bi-FE) have been employed, for the first time, to measure the free concentration of Pb(II) in aqueous solutions using AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) with ... -
Determination of the iodine value of biodiesel using 1H NMR with 1,4-dioxane as an internal standard
(Elsevier, 2010)Iodine values (IVs) of some biodiesel samples were analyzed using both 1H NMR and a standard iodometric method. 1H NMR was carried out with and without 1,4-dioxane as an internal standard (IS). The results obtained using ... -
Determination of Zn2+ concentration with AGNES using different strategies to reduce the deposition time
(Elsevier, 2005)Absence of gradient and Nernstian equilibrium stripping (AGNES) senses the free ion concentration of Zn(II) in solutions containing different ligands, being unaffected by the lack of reversibility of the Zn2+/Zn0 couple ... -
Development of aroma-synthesising capacity throughout fruit maturation of ‘Mondial Gala’ apples
(Taylor & Francis, 2008)Emission of aroma volatile compounds (AVCs) and the activity of some related enzymes were monitored during ontree maturation of ‘Mondial Gala’ apples. Volatile esters were quantitatively prominent among the AVCs ... -
Differential contribution of the two major polygalacturonases from Penicillium digitatum to virulence towards citrus fruit
(Elsevier, 2018-10)The fungus Penicillium digitatum is the causal agent of the citrus green mould, the major postharvest diseases of citrus fruit. Lesions on the surface of infected fruits first appear as soft areas around the inoculation ... -
Direct determination of free metal concentration by implementing stripping chronopotentiometry as second stage of AGNES
(The Royal society of Chemistry, 2011)The electroanalytical technique Absence of Gradients and Nernstian Equilibrium Stripping (AGNES) has been extended by applying stripping chronopotentiometry (SCP) as the re-oxidation stage in the determination of the free ... -
Direct determination of free Zn concentration in samples of biological interest
(Elsevier, 2022)The speciation of essential metal ions in biological fluids, such as blood plasma and serum, is of fundamental importance to understand the homeostasis of these elements. The activity of metal ions such as Zn2+ in extracellular ... -
Dispersive liquid–liquid microextraction and injection-port derivatization for the determination of free lipophilic compounds in fruit juices by gas chromatography-mass spectrometry
(Elsevier, 2017)A method consisting of dispersive liquid–liquid microextraction (DLLME) followed by injection-port derivatization and gas chromatography-mass spectrometry (GC–MS) for the analysis of free lipophilic compounds in fruit ... -
Dissolution and phosphate-induced transformation of ZnO nanoparticles in synthetic saliva probed by AGNES without previous solid-liquid separation. Comparison with UF-ICP-MS
(American Chemical Society, 2019-02-26)The variation over time of free Zn2+ ion concentration in stirred dispersions of ZnO nanoparticles (ZnO NPs) prepared in synthetic saliva at pH 6.80 and 37 degrees C was followed in situ (without solid liquid separation ... -
Dissolution Kinetics and Solubility of ZnO Nanoparticles Followed by AGNES
(American Chemical Society, 2012)There is a current debate on whether the toxicity of engineered ZnO nanoparticles (NPs) can be traced back to their nanoscale properties or rather to the simple fact of their relatively high solubility and consequent ... -
Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume
(Elsevier, 2021-06-24)The Amazon is Earth's largest river by volume output, making it an important source of trace metals and dissolved organic matter (DOM) to the Atlantic Ocean. Despite major recent anthropogenic disruptions to the Amazon ... -
Dissolved iodide in marine waters determined with Diffusive Gradients in Thin-films technique
(Elsevier, 2021)For the first time, Diffusive Gradient in Thin-films (DGT) focuses on the inorganic iodine species iodate (IO3) and iodide (I). A silver-doped Cl resin (AgdCl), which is known to selectively accumulate I, was used to ... -
Dissolved, labile, and total particulate trace metal dynamics on the northeast greenland shelf
(Wiley, 2022-11-20)We present high-resolution profiles of dissolved, labile, and total particulate trace metals (TMs) on the Northeast Greenland shelf from GEOTRACES cruise GN05 in August 2016. Combined with radium isotopes, stable oxygen ... -
Distribution of Dopant Ions Around Poly(3,4-ethylenedioxythiophene) Chains: A Theoretical Study
(Royal Society of Chemistry, 2017)The effect of counterions and multiple polymer chains on the properties and structure of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with ClO4− has been examined using density functional theory (DFT) calculations with ... -
Does total antioxidant capacity play a central role in postharvest deterioration of 'Sweetheart' sweet cherry fruit?
(International Society for Horticultural Science (ISHS), 2017)'Sweetheart' cherries (Prunus avium L.) have sweet flavour, bright red colour and a distinctive heart shape which contributes to their wide commercial acceptance. They display also comparatively high firmness and long ... -
Dynamic changes in health-promoting properties and eating quality during off-vine ripening of tomatoes
(Wiley, 2018)Tomato (Solanum lycopersicon L.) fruit is rich in various nutrients, vitamins and health-promoting molecules. Fresh tomatoes are an important part of the Mediterranean gastronomy, and their consumption is thought to ... -
Dynamics of trace metal sorption by an ion-exchange chelating resin described by a mixed intraparticle/film diffusion transport model. The Cd/Chelex case
(Elsevier, 2017-06-01)The time-evolution of Cd2+ ion sorption by Chelex 100 resin was studied in batch experiments as a function of time, pH, ionic strength, stirring rate, mass of resin and initial metal ion concentration. In the experimental ...