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| Titel |
A comparison of spectrophotometric and denuder based approaches for the determination of gaseous molecular iodine |
| VerfasserIn |
R. J. Chance, M. Shaw, L. Telgmann, M. Baxter, L. J. Carpenter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 1 ; Nr. 3, no. 1 (2010-02-09), S.177-185 |
| Datensatznummer |
250000822
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| Publikation (Nr.) |
 copernicus.org/amt-3-177-2010.pdf |
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| Zusammenfassung |
| The presence of molecular iodine in the atmosphere is thought to have
implications for both climate and human nutritional health, but measurement
of the gas at low concentrations requires technically demanding techniques
that are not widely accessible. Here, amylose coated denuder tubes and
solvent traps coupled with spectrophotometric detection are evaluated and
compared as relatively cheap and straightforward methods to measure gaseous
molecular iodine at environmentally relevant concentrations. Denuder tubes
were found to give unacceptably low and highly variable recoveries of
molecular iodine from a test gas source, with values ranging from 1 to
62%. Blank concentrations were also high, being equivalent to a gas phase
concentration of 5 pptv under typical operating conditions. Ethanol and
hexane solvent traps gave much better performance. Optimisation of the
hexane solvent trap method gave 100% recovery and an atmospheric limit of
detection of 70 pptv, which is within the range of concentrations observed
in the coastal marine atmosphere. |
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