Quantitative thermogravimetric analysis of binary mixtures |
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Authors: | van der Merwe E M Strydom C A |
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Institution: | (1) Department of Chemistry, UNISA, P.O. Box 392, 0003, South Africa E-mail;(2) Department of Chemistry, University of Pretoria, Pretoria, 0002, South Africa |
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Abstract: | Thermogravimetric analysis is used to determine the amounts of Mg(OH)2 and Mg(CH3COO)2in a mixture thereof. The application and suitability of different analysis methods are discussed. In the first method the
mass losses in the temperature ranges as indicated by the decomposition of the pure compounds were used. Results obtained
using these temperature ranges were unusable. The percentage mass losses due to the decomposition of Mg(OH)2 and Mg(CH3COO)2 were then determined in a second method using the minimum in the derivative mass vs. temperature curves. The results obtained
by this method compared well with the actual values for mixtures containing more than 15% magnesium acetate. The third method
employed the total experimental mass loss of both decomposition reactions. The results obtained using this method compared
well to the actual values, giving a R
2 value of more than 0.99. This method of using the total mass losses can however only be used for binary mixtures that consist
only of magnesium hydroxide and magnesium acetate.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | magnesium acetate magnesium hydroxide TG quantitative determination |
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