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In solid earth geochemistry, Cd is generally classified as a trace element that has both lithophile and chalcophile characteristics. The Cd content of geological samples is usually low (typical quantities are 0.01–0.5 μg g-1) (1,2). The geochemistry of Cd in the ocean and marine sediments has attracted significant scientific interest for more than 30 years. This interest is primarily based on the observation that dissolved Cd concentrations in seawater show a correlation with the distribution of the marine macronutrient phosphate (3). In addition, accurate determination of Cd is imperative for Cd isotopic analysis, which in turn is important for the study of cosmology, tracing anthropogenic sources, micronutrient cycling, and ocean productivity.

Accurate Determination of Trace Cadmium in Geological Reference Materials by Closed Vessel Acid Digestion ETAAS