Electrospray mass spectrometry for actinides and lanthanide speciation

Actinide Colloids and Particles of Environmental Concern

“…TRLIF is highly sensitive but limited to investigation of fluorescing metals, whereas ESI MS is less sensitive but can be applied to any element and provides direct information on the stoichiometry of the complexes. 153 A study reported in ref 154 observed hydrolysis of uranyl monomers and formation of polymers…”

“…In combined ESI and time-resolved laser induced fluorescence (TRLIF) studies, mono- and polynuclear uranyl hydroxide complexes were observed. , The authors pointed out that combining the complementary techniques TRLIF and ESI MS is particularly helpful. TRLIF is highly sensitive but limited to investigation of fluorescing metals, whereas ESI MS is less sensitive but can be applied to any element and provides direct information on the stoichiometry of the complexes . A study reported in ref observed hydrolysis of uranyl monomers and formation of polymers [U m O 2 m (X,Y) 2 m −1 (H 2 O) n ] + ; (X,Y = OH – , NO 3 – ; m < 5) in acidic solutions over a wide concentration range of [U] tot = 10 –8 –10 –2 M. Although the unambiguous identification leaves no doubt that the polynuclear species formed in solution, the authors did not measure pH, which precludes use of these findings for calculating equilibrium constants.…”

Assignment of complex species by affinity capillary electrophoresis: The case of Th(IV)‐desferrioxamine B

“…However, none of these techniques is able to differentiate species merely by their electrical charge. In that respect, attempts to use ESI‐MS have been reported [3‐5]. In spite of the mild ionization processes and rapid solvent evaporation in the source, both the abundance and nature of the gas‐phase species do not necessarily mirror the solution speciation at a given concentration level [6,7], as equilibria for labile species are displaced while droplets are concentrating.…”

Study of metal–ligand species by ESI-MS: The case of La, Nd and Th complexes with EDTA

“…They found correlation between stochiometries and binding sites available on the ligand. In the frame of nuclear toxicology and nuclear waste partition, Moulin et al [14] studied the complexation of Ln and An with diethylenetriaminepentaacetic acid, 1-hydroxyethane-1, 1-diphosphonic acid and di-triazin-pyridine. They employed a triple quadrupole instrument and compared their results with TR-LIF, showing coincidence between the results obtained in the gas phase and the liquid phase.…”