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The annular denuder technique has been employed at the Joint Research Centre EMEP Station to measure gaseous (sulphur dioxide, ammonia, nitrous, nitric and hydrochloric acids) and aerosolic (ammonium, sulphate, nitrate, chloride) species in the atmosphere. Some of these results are compared with those found by the alkaline-impregnated filter pack technique. The two methods give reliable and comparable results for sulphur dioxide, sulphate and ammonium; while different and scattered results are found for nitrate, nitric and nitrous acids.

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Authors: GEISS H, JRC Ispra Estab. (IT);LEYENDECKER W, JRC Ispra Estab. (IT);SERRINI-LANZA G, JRC Ispra Estab. (IT);SERRINI G, JRC Ispra Estab. (IT)
Bibliographic Reference: Paper presented: Expert Meeting on Sampling, CHemical Analysis and Quality Assurance, Arona (IT), Oct. 10-14, 1988
Availability: Available from (1) as Paper EN 34334 ORA
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