Thermogravimetric studies on carbonaceous materials isolated from lung tissue by digestion in phosphoric acid: the catalysis of combustion by inorganic materials
✍ Scribed by I. Bergman
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 471 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
✦ Synopsis
In previous work by the author, low-and high-rank coal and soot had been isolated in good yield from post-mortem pneumoconiotic lungs by an acetic acid digestion, and thermogravimetry of the residues had enabled the coal rank to be evaluated and the sooty lungs to be distinguished from the rest. The differences in combustion temperature of these materials were less than those of undigested materials because of what appeared to be catalytic effects: the high-rank coal and soot adsorbed catalytic materials during digestion, whereas the low-rank coal lost materials that were presumably catalytic. In the present work attempts have been made to remove the catalytic materials adsorbed on the soot by use of alkali or mineral acids, but these served only to introduce further catalysts of combustion. The catalytic effects of a number of carbonates, oxides, halides and other salts on the thermogravimetric curves of coal and soot samples have been studied and related to previous work. In general, phosphates showed no catalytic effects. A procedure has therefore been developed for the digestion of lung tissue and clay minerals in phosphoric acid at 105'C. The rank of coal in residues from pneumoconiotic lungs could not be so well evaluated as after acetic acid digestion, but coal, soot, and graphite could more easily be distinguished from one another.