Two makes of ammonia gas sensing membrane probes were evaluated.
Calibration curves were determined repeatedly during three months both in
separate solutions and in flowing solutions and in the air gap mode.Response
times by a step change of analyte concentration were determined.Only minor
differences between different makes were found.The measuring range of the
probe is about from 1 mol/dm3 to 10 6 mol/dm3.The response time is dependent
on concentration level so that at higher concentrations the probes respond
considerably faster than at lower concentrations.A marked decrease in response
time occurs at the concentration range of 10 4 10 5 mol/dm3.Response times
are of few seconds to several minutes.The ammonia probes were found convenient
and useful devices though their manipulation requires a certain degree of
care.
| Original language | English |
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| Place of Publication | Espoo |
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| Publisher | VTT Technical Research Centre of Finland |
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| Number of pages | 22 |
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| ISBN (Print) | 951-38-1336-3 |
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| Publication status | Published - 1981 |
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| MoE publication type | Not Eligible |
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| Series | Technical Research Centre of Finland. Publications |
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| Number | 6 |
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| ISSN | 0358-5069 |
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