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Measurement of ambient ammonia with diffusion tube samplers

Results of a study to evaluate the suitability of passive samplers for the measurement of monthly averaged ammonia concentrations are presented. Five different samplers were tested. Four were diffusion tube samplers which differed in length and in the way they were modified to minimize disturbing effects of wind turbulence. Also tested was a...

Micrometeorological measurement of the dry deposition flux of sulphate and nitrate aerosols to coniferous forest

Dry deposition fluxes of sulphate and nitrate have been determined over a coniferous canopy using the aerodynamic gradient technique. Vertical concentration gradients of sulphate and nitrate were measured with filters; the gradient of ammonium bisulphate was measured with thermodenuders. Filter measurements of sulphate yielded a deposition...