Search results for " Sequestering ability"

showing 7 items of 7 documents

A novel thermodynamic approach for the complexation study of toxic metal cations by a landfill leachate

2018

Landfill leachates can contaminate nearby aquifers. The hazards deriving from this contamination also depend on the chemical speciation of various contaminants. A novel approach is proposed here to face this problem from a chemical thermodynamics point of view. The complexing ability of the soluble fraction of a landfill leachate (collected from Bellolampo, Palermo, Italy) towards Pb2+, Cd2+ and Cu2+ has been investigated at T = 298.15 K in NaClaq at I = 0.1 mol dm−3. The soluble fraction of the landfill leachate was first characterized by different analytical techniques. Then, its acid–base properties were studied by ISE-H+ potentiometric titrations and modelled by the so-called diprotic-l…

Aqueous solutionChemistryPotentiometric titrationInorganic chemistry02 engineering and technologyGeneral Chemistry010501 environmental sciences021001 nanoscience & nanotechnology01 natural sciencesCatalysisMetalAnodic stripping voltammetryLandfill leachate sequestering ability complexation toxic metalsChemical thermodynamicsSequestrantvisual_artMaterials Chemistryvisual_art.visual_art_mediumTitrationSettore CHIM/01 - Chimica AnaliticaLeachate0210 nano-technology0105 earth and related environmental sciences
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Sequestering ability of some chelating agents towards methylmercury(II).

2013

A study on the interactions between CH3Hg+ and some S, N and O donor ligands (2-mercaptopropanoic acid (thiolactic acid (H2 TLA)), 3-mercaptopropanoic acid (H2 MPA), 2-mercaptosuccinic acid (thiomalic acid (H3 TMA)), d,l-penicillamine (H2 PSH), l-cysteine (H2 CYS), glutathione (H3 GSH), N,N′-bis(3-aminopropyl)-1-4-diaminobutane (spermine (SPER)), 1,2,3,4,5,6-benzenehexacarboxylic acid (mellitic acid (H6 MLT)) and ethylenediaminetetraacetic acid (H4 EDTA)) is reported. The speciation models in aqueous solution and the possible structures of the complexes formed are discussed on the basis of potentiometric, calorimetric, UV spectrophotometric and electrospray mass spectrometric results. For t…

Inorganic chemistryElectrospray ionisation mass spectrometry (ESI-MS)Ethylenediaminetetraacetic acidCalorimetryBiochemistrySequestering ability of S N and O donor ligandAnalytical Chemistrychemistry.chemical_compoundHydrolysisSettore CHIM/01 - Chimica AnaliticaChelationMellitic acidThiomalic acidEnvironmental Restoration and RemediationChelating AgentsThiolactic acidAqueous solutionMolecular StructureLigandMethylmercury(II) cationMethylmercury CompoundsKineticschemistryMethylmercury(II) cation; Sequestering ability of S; N and O donor ligands; UV–spectrophotometry; Electrospray ionisation mass spectrometry (ESI-MS); PotentiometryPotentiometryEnvironmental PollutantsUV–spectrophotometryNuclear chemistryAnalytical and bioanalytical chemistry
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Sequestering ability of polyaminopolycarboxylic ligands towards dioxouranium(VI) cation

2006

Abstract In the present paper, some results of an investigation (at t = 25 °C by potentiometry, ISE-H+ glass electrode) on the sequestering ability of five different polyaminopolycarboxylic ligands [Nitrilotriacetate (NTA), ethylenediamine-N,N,N′,N′-tetraacetate (EDTA), ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetate (EGTA), diethylenetriamine-N,N,N′,N″,N″-pentaacetate (DTPA), triethylenetetraamine-N,N,N′,N″,N′′′,N′′′-hexaacetate (TTHA)] towards dioxouranium(VI) cation in sodium chloride aqueous solutions, at I = 0.7 mol L−1 are reported. Calculations performed on potentiometric data gave evidence of the formation of the following species (log β in parenthesis): UO2(NTA)H0 (12…

Sequestering abilityEthyleneAqueous solutionLigandSpeciationMechanical EngineeringSodiumPotentiometric titrationMetals and Alloyschemistry.chemical_elementDioxouranium(VI); Polyaminopolycarboxylic ligands; Speciation; Sequestering ability; Stability constantsPolyaminopolycarboxylic ligandsDioxouranium(VI)chemistry.chemical_compoundEGTAchemistryMechanics of MaterialsStability constants of complexesMaterials ChemistrySettore CHIM/01 - Chimica AnaliticaChelationPolyaminopolycarboxylic ligandStability constantsNuclear chemistryJournal of Alloys and Compounds
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Sequestration of (CH3)Hg+ by amino‐polycarboxylic chelating agents

2012

Abstract The speciation of mono-methylmercury(II) cation (MeHg+) in the presence of Nitrilotriacetate (NTA), Ethylenediamine-N,N,N′,N′-tetraacetate (EDTA), diethylenetriamine-N,N,N′,N″,N″-pentaacetate (DTPA) and (S,S)- Ethylenediamine-N,N′-disuccinic acid (S,S-EDDS) was investigated at I = 0.1 mol L− 1 (NaCl) with the aim to assess a trend of sequestering capacity of the amino‐polycarboxylic (APCs) ligand class towards this cation in aqueous solution. The results obtained gave evidence for the formation of a mononuclear [MeHg(APC)] complex species, differently protonated MeHg(HiL) species (i = 1 to 3, depending on the APC considered), a mixed hydroxo species [MeHg(APC)(OH)] and a binuclear …

Sequestering abilitymedia_common.quotation_subjectInorganic chemistryMethylmercury(II) Complexones Equilibrium analysis Sequestering ability Speciation studiesProtonationMedicinal chemistryComplexoneMaterials ChemistryChelationSettore CHIM/01 - Chimica AnaliticaPhysical and Theoretical ChemistrySpeciation studiesSpectroscopymedia_commonContaminated soilsAqueous solutionChemistryLigandEquilibrium analysisSequestering AgentCondensed Matter PhysicsComplexonesAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsSpeciationMethylmercury(II)Ionic strengthEquilibrium analysi
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Speciation Studies of Bifunctional 3-Hydroxy-4-Pyridinone Ligands in the Presence of Zn2+ at Different Ionic Strengths and Temperatures

2019

The acid&ndash

acid–base properties3 hydroxy 4 pyridinonePharmaceutical ScienceIonic bondingProtonation02 engineering and technologyAnalytical Chemistry03 medical and health sciencessymbols.namesakechemistry.chemical_compoundacid base propertiesZn-complexationDrug Discoveryspecific ion interaction theorySettore CHIM/01 - Chimica AnaliticaPhysical and Theoretical ChemistryBifunctionalEquilibrium constant030304 developmental biologyVan 't Hoff equation0303 health sciencesLigandOrganic Chemistryextended Debye Hückel3-hydroxy-4-pyridinone3 hydroxy 4 pyridinone; speciation; acid base properties; extended Debye Hückel; Zn-complexation; specific ion interaction theory; van’t Hoff equation; sequestering ability021001 nanoscience & nanotechnologysequestering abilityextended Debye–Hückel3. Good healthvan’t Hoff equationSpecific ion interaction theorychemistryspeciationChemistry (miscellaneous)Ionic strengthsymbolsMolecular MedicinePhysical chemistry0210 nano-technologyacid–base propertie
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On the Complexation of Cu(II) and Cd(II) With Polycarboxyl Ligands. Potentiometric Studies With ISE-H+, ISE-Cu2+, and ISE-Cd2+

2009

The interaction of Cu2+ and Cd2+ ions with polyacrylates (PAA, 2 kDa and 100 kDa), polymetacrylate(PMA, 5.4 kDa), and alginate (AA, 70 kDa to 100 kDa) was studied by potentiometry, using ISE-Cu2+, ISE-Cd2+, and ISE-H+ electrodes. The investigations were performed in NaNO3 aqueous solutions, in the ionic strength range 0.10 e I (mol ·L-1) e 0.75, at T ) 298.15 K. The “diprotic-like model” was used to explain the acid-base behavior of the polycarboxylates under investigation (for this model, the monomeric unit of the polyelectrolyte is considered as a dicarboxylate). The results give evidence for the formation of the ML species in all the systems investigated. In addition, the MLH species was…

inorganic chemicalsAcrylate polymerchemistry.chemical_classificationSequestering abilitypolycarboxylic acidsLigandGeneral Chemical EngineeringIonic strength dependencePotentiometric titrationInorganic chemistryGeneral ChemistryUronic acidComplexation Potentiometric study polyelectrolytesPolysaccharidePolyelectrolytechemistry.chemical_compoundchemistryIonic strengthSodium nitrateSettore CHIM/01 - Chimica Analiticapolycarboxylic acids; Sequestering ability; Ionic strength dependenceNuclear chemistryJournal of Chemical & Engineering Data
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Complex formation of copper(II) and cadmium(II) with pectin and polygalacturonic acid in aqueous solution. An ISE-H + and ISE-Me 2+ electrochemical s…

2012

The acid-base properties of pectin and its ability to complex with copper(II) or cadmium(II) were quantitatively determined in order to define the ability of this natural polyelectrolyte to sequester metal ions. Potentiometric measurements carried out at different ionic strengths (0.1 - 0.7 mol L-1, in Na+ ionic medium) allowed us to define the acid-base properties of pectin together with the dependence of the protonation constants on ionic strength and to calculate the protonation constant at infinite dilution. The formation of complex species between pectin and copper(II) or cadmium(II) was investigated potentiometrically (using H+, Cu2+ and Cd2+ Ion Selective Electrodes, ISEs) in NaNO3 a…

polysaccharides as chelating agents; metal sequestering ability; complex formation; speciation studiescomplex formationpolysaccharides as chelating agentsSettore CHIM/01 - Chimica Analiticametal sequestering abilitypolysaccharides as chelating agentspeciation studies
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