Passive Sampling of Nitrogen Dioxide and Passive Sampling of Nitrogen Dioxide and Sulfur Dioxide in Ambient Air of Chiang Mai Sulfur Dioxide in Ambient Air of Chiang Mai Shakya, K.M. Shakya, K.M. 1 , P. Thavornyutikarn , P. Thavornyutikarn 1 , S. , S. Chantara Chantara 1 , W. Saipunkaew , W. Saipunkaew 1 , H. Mosbaek , H. Mosbaek 2 7 December 2004 1. Environmental Science Program, Faculty of Science, Chiang Mai University, Thailand 2. Technical University of Denmark, Denmark
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Passive Sampling of Nitrogen Dioxide and Sulfur Dioxide in Ambient Air of Chiang Mai Shakya, K.M. 1, P. Thavornyutikarn 1, S. Chantara 1, W. Saipunkaew.
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Passive Sampling of Nitrogen Dioxide and Sulfur Passive Sampling of Nitrogen Dioxide and Sulfur Dioxide in Ambient Air of Chiang MaiDioxide in Ambient Air of Chiang Mai
Shakya, K.M.Shakya, K.M.11, P. Thavornyutikarn, P. Thavornyutikarn11, S. Chantara, S. Chantara11, , W. SaipunkaewW. Saipunkaew11, H. Mosbaek, H. Mosbaek22
7 December 2004
1. Environmental Science Program, Faculty of Science, Chiang Mai University, Thailand2. Technical University of Denmark, Denmark
Passive SamplingPassive Sampling
• First described by Palmes First described by Palmes et al.et al. (1976) in occupational hygiene (1976) in occupational hygiene
for measuring NOfor measuring NO22 in indoor air in indoor air
• Based on diffusion principleBased on diffusion principle
• Collection of gas on sampling medium soaked with absorbent Collection of gas on sampling medium soaked with absorbent
by chemical absorption (Krupa and Legge, 2000)by chemical absorption (Krupa and Legge, 2000)
• Sampling medium – filter papers or steel meshesSampling medium – filter papers or steel meshes
• Absorbent – depends on gas of interestAbsorbent – depends on gas of interest
1. 1. IntroductionIntroduction
AdvantagesAdvantages
• Light, cheap, robust, easy to Light, cheap, robust, easy to
operateoperate
• Small, soundless and reusableSmall, soundless and reusable
• On-site power and pumping of air On-site power and pumping of air
not requirednot required
• Do not require attention during Do not require attention during