Air Quality Monitoring. Diffusive & Passive Sampling

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1 Air Quality Monitoring Diffusive & Passive Sampling

2 Consult IVL IVL offers analysis of gas concentrations in ambient and indoor air using diffusive samplers. We can also offer investigations to solve specific problems. Applicability Mapping concentration patterns in cities Air quality measurements at remote sites Personal monitoring Indoor monitoring Corrosion studies Study of long-term trends with no gaps in data Model validations Infrastructure planning Selection of sites for realtime monitors Epidemiological studies

3 Diffusive sampling technique The technique is based on molecular diffusion of gases. The gas molecules diffuse into the sampler where they are quantitatively collected, which gives a concentration value integrated over time. Turbulent diffusion inside the sampler is avoided by using a membrane at the inlet. Correct air concentrations are obtained if theoretical sampling rates are used. Air concentration patterns being mapped in Johannesburg. IVL s diffusive sampler is designed to avoid effects from wind and humidity as well as interferences and losses during storage. The samplers are thoroughly tested and verified and continually assessed. More components are added as needed. The IVL laboratory is accredited according to ISO/ IEC and performs about analyses for diffusive samplers annually.

4 Advantages small, silent and light weight does not need electricity flexible with the exposure site location samplers can be stored at room temperature no skilled personnel needed at the sampling site samplers are conveniently sent to IVL by regular mail analysed at IVL s accredited laboratories

5 Passive particle sampler Particular matter cannot be collected quantitatively using diffusive sampling. However, with a passive collector particles with a high deposition rate can be sampled and analysed. This sampler has extensively been used in connection with corrosion studies as well as screening studies. For more information about our passive sampler, please visit our website References IVL s samplers have been used all over the world and in various locations, for example: Emission inventory validation in Kathmandu Mapping of air concentration in Johannesburg Corrosion studies in Athens Studies of volcanic gases in Italy More references and areas of use can be found on our website

6 Short history Our diffusive sampler was first developed in 1989 by IVL researcher Martin Ferm, who has developed several sampling techniques, for example a horizontal flux sampler for ammonia and a series of low cost PM X samplers. The first sampler including diffusion was the denuder, used for measuring very low NH 3 concentrations and first used in 1977.

7 Gas Samplers Sulphur dioxide (SO 2 ) Nitrogen dioxide (NO 2 ) Ammonia (NH 3 ) Ozone (O 3 ) Organic acids, HCl, HF Mercury (Hg) Nitric acid (HNO 3 ) VOC Two kits of samplers are available, one for indoor air and one for corrosion studies. We also supply for separate orders of individual samples.

8 IVL Swedish Environmental Research Institute is Sweden s leading institute for applied research in the fields of climate, energy, environment and sustainable growth. IVL has accredited laboratories which ensure reliable, high quality analyses. Please visit our websites for more information: Contact persons: Karin Sjöberg karin.sjoberg@ivl.se Martin Ferm martin.ferm@ivl.se Gunilla Pihl-Karlsson gunilla.pihl.karlsson@ivl.se