Passive samplers (PS) are simple to use and require no electricity. However thei
ID: 964675 • Letter: P
Question
Passive samplers (PS) are simple to use and require no electricity. However their sampling rates are much lower than active samplers (AS) which use pumps to use move air through a sampling medium. For both types of samplers the sorbent material is extracted after exposure, and the extract analyzed to determine the mass sorbed. This mass is then converted to a concentration in the air using the volume of air sampled. For AS the volume of air sampled can be easily measured. However for PS this volume needs to be calculated based on the characteristics of the sampler. How can you design a passive sampler so that the sampling rate is only a function of temperature and independent of where the sampler is placed (i. e. the sampling rate would be the same if the sampler was indoors under low wind speeds or outdoors at higher wind speeds)?Explanation / Answer
For this read the article below on internet :
"http://www.nus.edu.sg/nurop/2010/Proceedings/FoE/Design%20of%20Nitrogen%20Dioxide%20Passive%20Samplers.pdf"