Chromium interaction with O-donor humic-like ligands using electrospray-ionization mass spectrometry
2013
The study of the interaction of chromium with O-donor humic-like ligands is
performed by electrospray-ionization mass spectrometry (ESI-MS) and
ultraviolet/visible (UV/VIS) spectrophotometry. Heterogeneity of functional
groups justifies the use of model compounds of humic substances. For studying
the interaction of chromium with humic substances as model substances were
used benzoic, salicylic, phthalic and citric acid, which include O-donor
atoms, also present in heterogenous and polydispersed ligands, such humic and
fulvic acids are. The intensity of the interaction is correlated with the
acid-base and electron-donor properties, geometric and steric
characteristics, and the number and the positions of O-donor atoms in the
investigated ligands. UV/Vis data describing chromium interaction with
humic-like ligands is placed in correlation with the ESI-MS data of the
complexes, both in quantitative and in qualitative terms. UV/VIS spectroscopy
and ESI-MS quantification showed a large difference in the informativeness of
describing the interaction of chromium(III)-ligand, in favor of ESI-MS
technique. ESI-MS technique can be used for quantitative analysis of the
system Cr(III)-ligand. ESI-MS ion current chromatograms of 20 μL loop
injections of systems Cr(III)-ligand, indicate a stabile peak and signal
integrity.
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