0000000000787442

AUTHOR

Christian Willberger

showing 3 related works from this author

Determination of kinetic parameters of redox reactions using CE‐ICP‐MS: A case study for the reduction of Np(V) by hydroxylamine hydrochloride

2018

The rate constants k of the reduction of 5 × 10-5  M Np(V) to Np(IV) by hydroxylamine hydrochloride (HAHCl) in 1 M HCl have been determined by CE-ICP-MS in the temperature range of ϑ = 30-70°C and with varying concentrations of HAHCl from 1 to 7.2 M. The reaction was found to have (pseudo)first order kinetics with respect to HAHCl. The experimental results for k ranged from 0.0029(1) min-1 (ϑ = 40°C, c(HAHCl) = 3 M) to 0.039(7) min-1 (ϑ = 60°C, c(HAHCl) = 7.2 M). The activation energy of the reaction was determined as EA  = (72 ± 10) kJ/mol. These results and a comparison with literature data show that the coupling of CE to ICP-MS provides a powerful analytical tool for the investigation of…

Clinical BiochemistryInorganic chemistrychemistry.chemical_elementHydroxylamine02 engineering and technologyActivation energy01 natural sciencesBiochemistryRedoxMass SpectrometryAnalytical ChemistryNeptuniumReaction rate constantTransition metalChemistryNeptunium010401 analytical chemistryTemperatureElectrophoresis CapillaryActinideRate equationAtmospheric temperature range021001 nanoscience & nanotechnology0104 chemical sciencesKineticsReducing Agents0210 nano-technologyOxidation-ReductionELECTROPHORESIS
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Investigation of the Electrophoretic Mobility of the Actinides Th, U, Np, Pu, and Am in Different Oxidation States.

2019

The electrophoretic mobilities (μe) of the actinides Th and U-Am in different oxidation states (prepared in 1 M HCl and 1 M HClO4) have been determined by capillary electrophoresis (CE)-inductively coupled plasma mass spectrometry (ICPMS) using 1 M acetic acid as the background electrolyte, which has proven to provide an excellent setup for trace analysis at environmentally relevant concentrations (1 × 10-9 M). The values are independent of the respective acid solution. The μe of the Pu oxidation states +III to +VI have been measured. They agree with both the available literature data and the redox-stable analogues (Eu(III), Th(IV), Np(V), U(VI)) that have also been investigated. The trend …

Acetic acidchemistry.chemical_compoundElectrophoresisCapillary electrophoresischemistryAnalytical chemistryTrace analysisElectrophoretic mobilitiesElectrolyteActinideMass spectrometryAnalytical ChemistryAnalytical chemistry
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Determination of the Stability Constants of the Acetate Complexes of the Actinides Am(III), Th(IV), Np(V), and U(VI) Using Capillary Electrophoresis-…

2019

Capillary electrophoresis-inductively coupled plasma mass spectrometry (CE-ICP-MS) was used to determine the stability constants of the actinides Am(III), Th(IV), Np(V), and U(VI) at an ionic strength of I = 0.3 M. The obtained stability constants were extrapolated to zero ionic strength by means of the Davies equation. For both U(VI) and Am(III), three consecutive acetate complexes with log(β

Chromatography010405 organic chemistryChemistryCapillary actionIonic bondingActinidePlasma010402 general chemistryMass spectrometry01 natural sciences0104 chemical sciencesInorganic ChemistryCapillary electrophoresisPhysical and Theoretical ChemistryInductively coupled plasma mass spectrometryInorganic chemistry
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