Application of ultrasonic measurements to the determination of concentration of coal extracts
✍ Scribed by Marta Krzesińska; Janusz Pajak
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 180 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0378-3820
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## Abstract The HPLC‐ICPMS determination of gallium porphyrins in various coal extracts is described. The HPLC‐ICPMS results are compared with results obtained by HPLC‐UV/VIS. The presence of gallium has been confirmed in all the porphyrin macrocycles.
FT-i.r. studies of acid-demineralized and cation-loaded lignites demonstrate that exchange methods presently being used to determine carboxylic acid groups in coal produce systematic errors. An i.r. method based on intensity measurements of the 1710 cm-' carboxylic acid C=O stretching mode is report