Laboratory validation of a passive sampler for SO2 atmospheric monitoring

Journal of the Brazilian Chemical Society

Lícia P. S. Cruz¹  Vânia P. Campos¹  Jussival A. P. Novaes¹  Tania M. Tavares¹ 

[1] ,Universidade Federal da Bahia Instituto de Química Salvador BA ,Brazil

关键词: passive sampling;    atmospheric sulfur dioxide;    air monitoring;   

DOI  :  10.1590/S0103-50532005000100008

来源: SciELO

【 摘 要 】

The performance of a passive sampler was tested under exposure in Teflon chamber. The SO2 trapped in impregnated filter with 1.0 x 10-2 mol L-1 Na2CO3 solution was extracted in ultrasound bath with H2O2 solution for 15 min and determined as SO4(2-) by ion chromatography. The sampler presented good performance except for air in total stillness condition (0 m s-1), for very short exposure periods (0.5 h), for atmosphere with O3 > 150 mug m-3 and for high concentrations of reduced sulfur compounds. The relative humidity of the air (20 - 80%) and the exposure to zero concentration did not affect the sampler performance. It showed stability for one month at 4 ºC or for one week at about 25 ºC. Its precision varied within 3.5 and 23% depending of the SO2 concentration and the accuracy varied from 91 to 100%.

【 授权许可】

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