| Autor: |
Doolan KJ; The Broken Hill Proprietary Co. Ltd., Central Research Laboratories, Shortland, 2307, Australia., Belcher CB |
| Jazyk: |
angličtina |
| Zdroj: |
Talanta [Talanta] 1978 Jul; Vol. 25 (7), pp. 398-400. |
| DOI: |
10.1016/0039-9140(78)80121-0 |
| Abstrakt: |
The selective-electrode procedure described for determining 0.2-2.5% of nitrogen in coal and coke offers significant advantages over Kjeldahl distillation and titration. The Kjeldahl digest is diluted, neutralized, cooled, diluted to volume, adjusted to a standard temperature and rendered alkaline prior to measurement with an ammonia-selective electrode. Accuracy and precision of 1% relative are demonstrated by comparative analyses of a range of samples. Important experimental aspects discussed include the role as neutralization indicator played by vanadium derived from the catalyst, precision of the mV-meter, the influence of solution temperature and concentration, the repeatability of the readings, and interferences. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
