Comparison of open path and extractive long-path FTIR techniques in detection of air pollutants
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Tartalom: http://www.tandfonline.com/doi/abs/10.1080/05704920500385...
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published


Type = Article
Cím:
Comparison of open path and extractive long-path FTIR techniques in detection of air pollutants
Létrehozó:
Bacsik, Zoltán
Komlósi, Viktória
Ollár, Tamás
Mink, János
Dátum:
2006
Téma:
QC Physics / fizika
QC02 Optics / fénytan
Tartalmi leírás:
A comprehensive comparison of long-path extractive and open-path FTIR
techniques on the bases of the available literature and on our own experience at the
wastewater treatment plant of a chemical factory has been made. Two equalization
basins were investigated and it was supposed that all the surface of the wastewater
emits polluting compounds smoothly, since the atmospheric dispersion was found to
be ideal at both sites, there were no significant chemical reactions, and the basin dimensions
were rather small (7 x 16m2 and 37 x 79m2, respectively). Since the possibilities
were different, rather different optimal spectral parameters (resolution, scan
numbers, path length) were chosen for field and laboratory measurements. The S/N
ratio of laboratory spectra was about 50?100 times higher than that of field spectra,
which resulted in higher precision and lower detection limits of the measurements, and comparing to field measurements an additional compound (chloroform) was
detected. On the other hand, the extremely polar ammonia was not detectable by the
extractive technique. With the open-path method, time-dependent concentration
changes of the pollutants were monitored. The presence of the theoretically banned
organic phase in wastewater was demonstrated by detection of xylenes, isopropanol,
and methanol in the air above the basin. Comparing the results measured by the two
different techniques the discrepancies in the concentrations were dependent on the
compound under determination. In some cases, the concentrations agreed well; in
other cases, not. Consequently, to application of both methods is desirable in some
special cases; for example, when the extractive method is used for preliminary
investigations.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Bacsik, Zoltán and Komlósi, Viktória and Ollár, Tamás and Mink, János (2006) Comparison of open path and extractive long-path FTIR techniques in detection of air pollutants. APPLIED SPECTROSCOPY REVIEWS, 41 (1). pp. 77-97. ISSN 0570-4928
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