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Science 3 June 1966:
Vol. 152. no. 3727, pp. 1368 - 1370
DOI: 10.1126/science.152.3727.1368
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Articles

High-Purity Calcium Carbonate in Freshwater Clam Shell

D. J. Nelson 1, T. C. Rains 2, and J. A. Norris 2

1 Health Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennnessee
2 Analytical Chemnistry Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee

The calcium carbonate in freshwater clam shells is simlilar in purity to that designated reagent grade. A simple reprecipitation of the shell extract results in a product having less Sr and Mg than reagent grade CaCO3. Clams are harvested commercially, and discarded shells are a high-quality raw material for the production of CaCO3.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)