Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Comparison between dry deposition fluxes measured with water and solid surfaces, and estimated by an inferential model |
| Abstract | The quantification of the dry atmospheric input to natural surfaces is currently a complet task. In this study a water surface sampler (DAS) was used contemporary to conventional solid surface samplers (wet&dry and bulk) to monitor the dry deposition in a densely inhabitated and industrialised area. The dry contribution to the total deposition was 33-56% for sulfate, 11-39% for ammonium and 18-28% for nitrate ion, depending on the measurement technique. Among the three samplers, the DAS one was the most efficient to collect sulfate, ammonium and nitrate. The comparison of the seasonal trends showed that the dry collector using a polyethylene surface, collected mainly aerosol particles of ammonium sulfate, while the aqueous surface of DAS sampler was able to sample also the gaseous form of the pollutants. Sulfate and nitrate nux values determined from direct measurements were also compared with those obtained by a resistance model. The sulphate measured values fitted quite well with those predicted from the model showing similar seasonal variations. The quantitative differences observed in winter could be due to an increase in the acidity of water, used as collecting medium, which lowered the solubility of gaseous sulphur dioxide. In order to investigate the effect of water, used as collecting medium, which lowered the solubility of gaseous sulphur dioxide. In order to investigate the effect of water acidity on the deposition on a water body, a series of experiments were carried out. |
| Source | Annali di chimica (Testo stamp.) 90, pp. 467–478 |
| Journal | Annali di chimica (Testo stamp.) |
| Editor | Societa chimica italiana, Roma, Italia |
| Year | 2000 |
| Type | Articolo in rivista |
| Authors | Balestrini R., Consuma A., Polesello S. and Tartari G. |
| Text | 235573 2000 Comparison between dry deposition fluxes measured with water and solid surfaces, and estimated by an inferential model Balestrini R., Consuma A., Polesello S. and Tartari G. IRSA CNR, Brugherio The quantification of the dry atmospheric input to natural surfaces is currently a complet task. In this study a water surface sampler DAS was used contemporary to conventional solid surface samplers wet dry and bulk to monitor the dry deposition in a densely inhabitated and industrialised area. The dry contribution to the total deposition was 33 56% for sulfate, 11 39% for ammonium and 18 28% for nitrate ion, depending on the measurement technique. Among the three samplers, the DAS one was the most efficient to collect sulfate, ammonium and nitrate. The comparison of the seasonal trends showed that the dry collector using a polyethylene surface, collected mainly aerosol particles of ammonium sulfate, while the aqueous surface of DAS sampler was able to sample also the gaseous form of the pollutants. Sulfate and nitrate nux values determined from direct measurements were also compared with those obtained by a resistance model. The sulphate measured values fitted quite well with those predicted from the model showing similar seasonal variations. The quantitative differences observed in winter could be due to an increase in the acidity of water, used as collecting medium, which lowered the solubility of gaseous sulphur dioxide. In order to investigate the effect of water, used as collecting medium, which lowered the solubility of gaseous sulphur dioxide. In order to investigate the effect of water acidity on the deposition on a water body, a series of experiments were carried out. 90 Articolo in rivista Societa chimica italiana 0003 4592 Annali di chimica Testo stamp. Annali di chimica Testo stamp. Ann. chim. Testo stamp. Annali di chimica. Testo stamp. stefano.polesello POLESELLO STEFANO raffaella.balestrini BALESTRINI RAFFAELLA gianni.tartari TARTARI GIANNI |