Abstract
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.
Original language | English |
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Pages (from-to) | 73-85 |
Number of pages | 13 |
Journal | International journal of environmental analytical chemistry |
Volume | 56 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1994 |
Externally published | Yes |
Keywords
- SULFUR DIOXIDE
- PASSIVE SAMPLING
- TRIETHANOLAMINE
- SULFUR-DIOXIDE
- PERMEATION