High-purity calcium carbonate in freshwater clam shell.
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 CaCO(3). Clams are harvested commercially, and discarded shells are a high-quality raw material for the production of CaCO(3).
Nelson
D J
DJ
Rains
T C
TC
Norris
J A
JA