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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Analysis of Carbonate Rocks for Calcium, Magnesium, Iron, and Aluminum with EDTA
Ramon E. Bisque
ABSTRACT
A procedure for the rapid volumetric analysis of carbonate rocks for calcium, magnesium, iron, and aluminum is presented in a form to aid the inexperienced analyst. The four elements are determined with the use of EDTA (ethylenediaminetetracetic acid), an organic chelating agent. Instructions for the gravimetric determination of silica are also included.
Literature concerning the determination of calcium, magnesium, and iron with EDTA has appeared in the chemical journals (Cheng and others, 1952; Banewicz and Kenner, 1952; see also Welcher, 1958), and the adaptation of EDTA techniques to the determination of aluminum has also been discussed (Wanninen and Ringbom, 1955; Davis and Jacobsen, 1960). The inexperienced analyst might find it difficult, however, to trace and apply the information to the problem of analyzing carbonate rocks for the four elements mentioned. It is felt that this report will enable a person with a minimum of analytical training to perform analyses rapidly and with accuracy sufficient for most commercial and investigative needs. A list of the chemicals and equipment required is included, and sample calculations ar given. Knowledge of only the most fundamental laboratory operations such as "dilute to volume," "titrate," "transfer quantitatively," and "pipette," is assumed.
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