Abstract
Nitrogen-containing fuels produce hydrogen cyanide when the fuel is
gasified. The gas is poisonous and produces nitrogen oxides when it is
burned. HCN is usually sampled into alkaline solutions and analysed
using an ion selective electrode. The method is tedious and the
electrode response is temperature-dependent. Samples are not stable and
must be analysed immediately, and they contain ions which are poisonous
to the electrode. Therefore a new gas chromatographic method was
developed. In this new method HCN is released from the alkaline
solutions with sulphuric acid in a headspace sampler and analysed by a
gas chromatograph connected to an atomic emission detector. Measurements
on carbon emission line 193.1 nm gave the limit of detection 0.05 mg CN−/l in the solution. The calibration curve was linear to 1000 mg CN−/l and the correlation was 0.997. The relative standard deviation of the calibration was 1.7% at the concentration of 5 mg CN−/l and 1.0% at 25 mg CN−/l.
The developed headspace method allows automated analysis and it needs
less sample preparations than the ion selective electrode method. This
paper also reports the effect of sample preparation and storage time on
the stability of the samples.
Original language | English |
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Pages (from-to) | 1625 - 1630 |
Number of pages | 6 |
Journal | Analytical and Bioanalytical Chemistry |
Volume | 381 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2005 |
MoE publication type | A1 Journal article-refereed |
Keywords
- headspace gas chromatography
- AED
- HCN
- gasification product gas
- gasification