Abstract

In our spectrochemical studies of the trace element contents of animal and human bone, phosphate rock, and dolomite, the need arose to prepare and/or match standards and samples with reagent-grade calcium salt. However, reagent-grade calcium salts (e.g., CaCO₃) contained metal impurities that contributed to the reagent blank at a level found in the samples. A simple method is described that provides a means to purify the calcium carbonate of many trace metals.

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