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Open Access Green as soon as Postprint is submitted to ZB.
The application of 113Cd NMR spectrometry to the study of cadmium complexation by natural organic matter.
Appl. Geochem. 22, 1612-1623 (2007)
The results of a comprehensive 113Cd NMR study of complexation of Cd2+ by Suwannee River natural organic matter (NOM) are presented and compared with the more familiar behavior of simple systems containing Cd2+ and a single ligand (e.g., ethylenediamine). pH-dependent trends in the chemical speciation of Cd(II), chemical shift of 113Cd, and line width of resonance peaks lead to the conclusion that the contribution of N donor atoms to the primary coordination sphere of Cd2+ increases steadily with increasing pH, so much so that relatively strong downfield resonances can be observed at alkaline pH. Those observations also indicate that there is no accessible, unique combination of magnetic field strength and solution chemistry for which the exchange rates of all forms of Cd are simultaneously fast, intermediate, or slow.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
cadmium; NMR; natural organic matter; speciation
ISSN (print) / ISBN
0883-2927
e-ISSN
0883-2927
Journal
Applied Geochemistry
Quellenangaben
Volume: 22,
Issue: 8 SPEC. ISS.,
Pages: 1612-1623
Publisher
Elsevier
Reviewing status
Peer reviewed
Institute(s)
Institute of Ecological Chemistry (IOEC)