MONITORING SO2 WITH PASSIVE SAMPLERS - A LABORATORY EVALUATION OF NA2CO3 AND TRIETHANOLAMINE AS ABSORBING MEDIA

被引:21
|
作者
SCHEEREN, BA
DESANTIS, F
ALLEGRINI, I
HEERE, P
机构
[1] CNR,IST INQUINAMENTO ATMOSFER,AREA RIC,ROME,ITALY
[2] AGR UNIV WAGENINGEN,DEPT AIR POLLUT,WAGENINGEN,NETHERLANDS
关键词
SULFUR DIOXIDE; PASSIVE SAMPLING; TRIETHANOLAMINE;
D O I
10.1080/03067319408044419
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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.
引用
收藏
页码:73 / 85
页数:13
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