Monitoring So2 With Passive Samplers: A Laboratory Evaluation of Na2Co3 and Triethanolamine as Absorbing Media

B.A. Scheeren, F. De Santis, I. Allegrini, P. Heerees

OnderzoeksoutputAcademicpeer review

23 Citaten (Scopus)


Two different types of passive samplers (a badge and a tube-type) for the determination of SO2 have been developed. Both samplers make use of a Na2CO3 coated quartz fiber filter as sampling layer. SO2 is collected as sulfite which, after extraction and oxidation, is determined as sulfate using ion-chromatography. In laboratory calibration tests good linearity of the average uptake has been found over a SO2 concentration range from 20 to 400 ppb. The sensitivity and capacity of the method is sufficient to cover a wide range of ambient concentrations, while the badge and the tube have detection limits for a one week exposure of about 4 and 34 mu g/m3 respectively. Precision, calculated on replicates, for both samplers was found to be between 5 and 10%. The influence of humidity was studied in comparison to triethanolamine (TEA) coated substrates. It was seen that for the collection efficiency TEA coated filters show a 2 to 3 times stronger dependency on relative humidity in comparison to Na2CO3. It was also found that the badge type sampler showed good performance with an average windspeed higher than 1 m/s. The tube sampler was found to give reliable and accurate results at windspeeds lower than 1 m/s. Accuracy was investigated in the field in comparison with a diffusion denuder technique. Regression analysis of the data indicated good agreement between the two methods.

Originele taal-2English
Pagina's (van-tot)73-85
Aantal pagina's13
TijdschriftInternational journal of environmental analytical chemistry
Nummer van het tijdschrift1
StatusPublished - 1994
Extern gepubliceerdJa


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