Neutron activation analysis of carbonate reference materials: coral (JCp-1) and giant clam (JCt-1)

Two kinds of carbonate reference materials, coral (JCp-1) and giant clam (JCt-1), were subjected to neutron activation analysis (NAA) using the Kyoto University Reactor in order to determine the halogen contents (Cl, Br, and I), as well as the abundances of a few other elements in these materials. The results from the present study are in agreement with previously reported data using this technique. However, inconsistencies are observed between the NAA data and data derived from inductively coupled plasma mass spectrometry studies for some elements. From a comparison of the halogen contents in the two carbonate reference materials with those in sedimentary rocks, differences in the mode of formation of the two carbonates are discussed.