Determination of calcium and magnesium in limestone and dolomite by enthalpimetric flow-injection analysis.
A flow-enthalpimetric method for the determination of calcium and magnesium in limestone and dolomite is described. Calcium is determined by measuring the heat evolved from the substitution reaction with Mg-EDTA. The amount of magnesium is calculated from the calcium content and the enthalpimetric signal for the reaction of the sample solution with disodium-EDTA, which gives the total concentration of calcium and magnesium. Analysis of reference materials and other samples indicates an error not exceeding 0.3% of CaO and MgO, and a sampling rate of 100 samples per hour.
de Oliveira
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Instituto de Química, Universidade Estadual de Campinas, C.P. 6154, Campinas, SP, Brazil.
Mendes
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