Determination of calcium and magnesium in limestone and dolomite by enthalpimetric flow-injection analysis

Oliveira, Walace A. de; Mendes, Alexandre

doi:10.1016/0039-9140(87)80185-6

Cited by 9 publications

(1 citation statement)

References 6 publications

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“…Different complexometric and redox titration methods were applied for limestone [6,7] using a variety of titrants and colored indicators, such as disodium EGTA, calcon and EBT indicators [8,9], and azochromotropic acid derivative indicators [10]. Potentiometric titration using calcium sensitive electrodes [11] was also reported in literature, as well as flow-injection analysis [12] and atomic absorption spectroscopy methods [13]. Calcium oxide was determined in lime mortars by titrating with EDTA and methylene blue indicator [14]; however, the sample preparation and analysis are different from this study.…”

Section: Introductionmentioning

confidence: 99%

CALCIUM CONTENT OF LIME MORTARS FROM 19th CENTURY CHURCH RUINS IN THE PHILIPPINES USING VOLUMETRIC ANALYSIS

2017

MJAS

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A calcium determination method for lime mortars in old church ruins is described. Two volumetric analysis methods were employed: titration using EDTA solution, and with KMnO 4 solution. The binder fraction with sieve size (<0.075mm) was used for titration which is abundant in CaCO 3 as established by Fourier-Transform Infrared Spectroscopy (FTIR) technique. The mortar sample from Misamis Oriental yields a mean calcium concentration of 59.60% ± 4.64 and 60.48% ± 6.68 for EDTA and KMnO 4 , respectively, while the Metro Manila mortar sample is 73.54% ± 2.68 for EDTA and 73.33% ± 6.88 for KMnO 4. Two tailed t-test and F-test analysis confirm that there is no statistical difference between EDTA and KMnO 4 methods in determining the calcium content. Atomic Absorption Spectroscopy (AAS) technique validated the mean concentration values obtained from each method with less than 6.4% difference. The proposed titration methods are simple, rapid and sufficiently precise, without the use of expensive analytical instruments. This study is a good alternative method to easily determine the amount of calcium in historic lime mortars which is valuable in heritage conservation work and restoration of old structures in the Philippines.

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