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The chemical composition of 34 thinner samples obtained in the Metropolitan Area of Mexico City was quantified by gas chromatography. Both the total number and the composition of each of the identified compounds showed great variations from one sample to another. Nonetheless, toluene, n-hexane, acetone and nietliaiiol were the iiiost frequently and highest concentration conipounds identified in this study. By using a thermodynaniic model of solvent blend evaporation, which accounts for mixture non-idealities in tentis ol coinporient activity coefíicients, the evaporation time versus solvent composition (solvent balance) curves were calculated for 1 O of theanalyzed samples. The calculated evaporatioti rate showed a broad specúum in their behavior (fast, intermediate and low). Regarding solvait balance, in the 10 samples considered, tlie low solvency components (diluents) were evaporated disproportionately slow in regard to latent and high solvency (active) solvents. Tlie high solvency components rapidly became depleted in the residual solvent. This leads to the undesirable effect known as solvent imbalance. The appreciable differences observed in the total nuniber of compounds and iii their compositions, along with tlie evaporatioii behavior of the analyzed samples lead to conclude that apparently no technical, environmental or toxicological criteria were applied to formulate the cornrnercial analyzed samples.

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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2017
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