A procedure for the determination of calcium in natural waters is presented which is faster, more precise, and more accurate than those previously described. Photometric weight titration with ethylenediamine‐tetraacetate ion in the presence of ammonium purpurate is employed following isolation of the calcium by ion‐exchange chromatography. Calcium is separated from magnesium and strontium by the use of acetylacetone as a complexing elutant. Samples of sea water from the Bahamas region were examined by this procedure, and good agreement was found with reported values determined by the classical triple oxalate procedure. The calcium content is one per cent higher than that which would be expected from the accepted calcium‐chlorinity ratio. In addition, samples from the Chesapeake Bay indicate that the sea water source for this region has a greater calcium content than would be expected from the accepted calcium‐chlorinity ratio for sea water.
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James H. Carpenter (1957) studied this question.
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