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Solid State Cadmium-113 Nuclear Magnetic Resonance Study of Cadmium Speciation in Environmentally Contaminated Sediments

Dep. of Chemistry, State Univ. of New York, Albany, NY 12222;

Paul S. Marchetti and Paul D. Ellis

Dep. of Chemistry, Univ. of South Carolina, Columbia, SC 29208.

^* Corresponding author.

ABSTRACT

An initial investigation used solid state ¹¹³Cd nuclear magnetic resonance (NMR) spectroscopy to analyze five soil samples taken from an environmental site that is heavily contaminated with Cd and other metals. The experiments performed used Bloch decays, cross polarization, and echo train pulse sequences. The signals were obtained by coaddition transients numbering from 1000 to 500 000. Not all of the Cd present was observed by the NMR experiments likely due to the presence of paramagnetic species as indicated by the magnetic susceptibilities of the samples. Four cadmium species are indicated: (1) the carbonate as the major component; (2) a carbonate-like species but in a soil-like matrix; (3) a mixed hydroxycarbonate species; and (4) a species similar to (3) but in a soil-like environment. Dynamics (motion) is considered as a possibility for the larger linewidths of the species in the soil-matrix.

Contribution from the Dep. of Chemistry, State Univ. of New York and Univ. of South Carolina.

Received for publication February 29, 1988.