Differential scanning calorimetry as a general method for determining the purity and heat of fusion of high-purity organic chemicals. Application to 95 compounds

Thermodynamic study on the sublimation of six methylnitrobenzoic acids

“…From the recorded thermograms, the impurity mass fractions of the samples were computed using a fractional fusion technique. (10) The power scale of the calorimeter was calibrated with high-purity indium (mass fraction > 0.99999) and its temperature scale was calibrated by measuring the melting temperatures of the following high-purity reference materials: (11) naphthalene, benzoic acid, and indium.…”

Enthalpies and entropies of fusion and of sublimation at the temperature 298.15 K of thiourea and sevenN-alkylthioureas

“…peak profile method. (24)(25)(26) Samples from suppliers other than those reported in table 1 were also examined. However, the cor- responding results are not reported for the sake of simplicity, since they do not show any appreciable difference in the properties determined.…”

Organic chemistry section:

“…After two recrystallizat ions , 3 had a purity of 99-5 mole % y as determined by differential scanning calorimetry [33].…”

“…The pH values of solutions of urea samples 1-4 (2.5 g) in carbon dioxide-free , distilled water (25-0 ml, total volume) were measured with a Corning, expanded-scale, pH meter and were found to be 7-06, 7-06, 6.97, and 7-30, The experimental method used was that of Plato and Glasgow [77,78]. usually provides firm proof of identity; our work began with a comparisom of these two techniques.…”