{"id":{"repo_id":"milano","oai_identifier":"oai:air.unimi.it:2434/1232969"},"canonical_url":"https://search.dev.ndltd.org/etd/milano/oai:air.unimi.it:2434/1232969","repository":{"repo_id":"milano","name":"Università degli Studi di Milano","base_url":"https://air.unimi.it/oai/request"},"display":{"title":"STUDIO DELLA COMPOSIZIONE CHIMICA DEL DEPOSITO DI PARTICOLATO ATMOSFERICO E DELLA SUA INFLUENZA SULLA CONDUCIBILITÀ ELETTRICA DEGLI ISOLATORI DELLA RETE DI TRASMISSIONE","abstract":"Saline pollution represents a risk factor for the power networks. In this study a comprehensive chemical characterization of electric insulator deposits is presented. The two main locations were Milan, which, according to IEC 60815, resulted in a lightly polluted site, and Latina, a coastal mediumly-polluted site. Weathering, face of the insulator, vertical profile of and the presence of a hydrophobic coating were the studied factors. Weathering effect was predominant and synergic with the complex system of phenomena in act: vertical profile was in fact responsive to rain wash-off, while correlation with face factor was masked. The coating was responsible of high-risk situations during the hot period. Significative differences were observed between air particulate matter composition and deposits composition because of deposition itself and evolution phenomena: the deposit, despite atmospheric PM composition, is enriched in bicarbonates, calcium, sodium and chlorides while lacking largely ammonium sulphate and nitrate, newborn seasonality was also observed. Regarding carbonaceous, OC/EC ratio proved to be a peculiar characteristic in deposits being higher than in air up to a factor 10. The main campaigns were supported by intensive ones. Finally, a national campaign gave an idea of pollutant distribution over insulator throughout Italy: OC is more abundant in the southern, while EC in the northern. This work poses the basis for alert systems based on modelling tools. It is unparalleled in Italy and represents a step towards the resilience of the Italian electrical system.","abstract_html":"Saline pollution represents a risk factor for the power networks. In this study a comprehensive chemical characterization of electric insulator deposits is presented. The two main locations were Milan, which, according to IEC 60815, resulted in a lightly polluted site, and Latina, a coastal mediumly-polluted site. Weathering, face of the insulator, vertical profile of and the presence of a hydrophobic coating were the studied factors. Weathering effect was predominant and synergic with the complex system of phenomena in act: vertical profile was in fact responsive to rain wash-off, while correlation with face factor was masked. The coating was responsible of high-risk situations during the hot period. Significative differences were observed between air particulate matter composition and deposits composition because of deposition itself and evolution phenomena: the deposit, despite atmospheric PM composition, is enriched in bicarbonates, calcium, sodium and chlorides while lacking largely ammonium sulphate and nitrate, newborn seasonality was also observed. Regarding carbonaceous, OC/EC ratio proved to be a peculiar characteristic in deposits being higher than in air up to a factor 10. The main campaigns were supported by intensive ones. Finally, a national campaign gave an idea of pollutant distribution over insulator throughout Italy: OC is more abundant in the southern, while EC in the northern. This work poses the basis for alert systems based on modelling tools. It is unparalleled in Italy and represents a step towards the resilience of the Italian electrical system.","abstract_has_math":false,"creators":["BORELLI, MATTIA"],"institution":"Università degli Studi di Milano","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["tutor: P. Fermo ; co-tutor: G. Pirovano ; coordinator: D. Passarella","M. Borelli","FERMO, PAOLA","PASSARELLA, DANIELE"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2026,"date_issued":"2026-04-09","date_published":"2026-04-09","updated_at":"2026-07-27T20:19:08Z","subjects":["Settore CHEM-01/A - Chimica analitica"],"languages":["eng"],"rights":["info:eu-repo/semantics/embargoedAccess","license:Creative commons","license uri:http://creativecommons.org/licenses/by-sa/4.0/"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2434/1232969","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["tutor: P. Fermo ; co-tutor: G. Pirovano ; coordinator: D. Passarella","M. 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In this study a comprehensive chemical characterization of electric insulator deposits is presented. The two main locations were Milan, which, according to IEC 60815, resulted in a lightly polluted site, and Latina, a coastal mediumly-polluted site. Weathering, face of the insulator, vertical profile of and the presence of a hydrophobic coating were the studied factors. Weathering effect was predominant and synergic with the complex system of phenomena in act: vertical profile was in fact responsive to rain wash-off, while correlation with face factor was masked. The coating was responsible of high-risk situations during the hot period. Significative differences were observed between air particulate matter composition and deposits composition because of deposition itself and evolution phenomena: the deposit, despite atmospheric PM composition, is enriched in bicarbonates, calcium, sodium and chlorides while lacking largely ammonium sulphate and nitrate, newborn seasonality was also observed. Regarding carbonaceous, OC/EC ratio proved to be a peculiar characteristic in deposits being higher than in air up to a factor 10. The main campaigns were supported by intensive ones. Finally, a national campaign gave an idea of pollutant distribution over insulator throughout Italy: OC is more abundant in the southern, while EC in the northern. This work poses the basis for alert systems based on modelling tools. It is unparalleled in Italy and represents a step towards the resilience of the Italian electrical system."]},{"key":"dc:title","label":"Title","values":["STUDIO DELLA COMPOSIZIONE CHIMICA DEL DEPOSITO DI PARTICOLATO ATMOSFERICO E DELLA SUA INFLUENZA SULLA CONDUCIBILITÀ ELETTRICA DEGLI ISOLATORI DELLA RETE DI TRASMISSIONE"]}]}],"canonical_facts":{"dc:contributor":["tutor: P. Fermo ; co-tutor: G. Pirovano ; coordinator: D. Passarella","M. Borelli","FERMO, PAOLA","PASSARELLA, DANIELE"],"dc:creator":["BORELLI, MATTIA"],"dc:date":["2026-04-09"],"dc:description":["Saline pollution represents a risk factor for the power networks. In this study a comprehensive chemical characterization of electric insulator deposits is presented. The two main locations were Milan, which, according to IEC 60815, resulted in a lightly polluted site, and Latina, a coastal mediumly-polluted site. Weathering, face of the insulator, vertical profile of and the presence of a hydrophobic coating were the studied factors. Weathering effect was predominant and synergic with the complex system of phenomena in act: vertical profile was in fact responsive to rain wash-off, while correlation with face factor was masked. The coating was responsible of high-risk situations during the hot period. Significative differences were observed between air particulate matter composition and deposits composition because of deposition itself and evolution phenomena: the deposit, despite atmospheric PM composition, is enriched in bicarbonates, calcium, sodium and chlorides while lacking largely ammonium sulphate and nitrate, newborn seasonality was also observed. Regarding carbonaceous, OC/EC ratio proved to be a peculiar characteristic in deposits being higher than in air up to a factor 10. The main campaigns were supported by intensive ones. Finally, a national campaign gave an idea of pollutant distribution over insulator throughout Italy: OC is more abundant in the southern, while EC in the northern. This work poses the basis for alert systems based on modelling tools. It is unparalleled in Italy and represents a step towards the resilience of the Italian electrical system."],"dc:identifier":["https://hdl.handle.net/2434/1232969"],"dc:language":["eng"],"dc:publisher":["Università degli Studi di Milano"],"dc:relation":["numberofpages:164"],"dc:rights":["info:eu-repo/semantics/embargoedAccess","license:Creative commons","license uri:http://creativecommons.org/licenses/by-sa/4.0/"],"dc:subject":["Settore CHEM-01/A - Chimica analitica"],"dc:title":["STUDIO DELLA COMPOSIZIONE CHIMICA DEL DEPOSITO DI PARTICOLATO ATMOSFERICO E DELLA SUA INFLUENZA SULLA CONDUCIBILITÀ ELETTRICA DEGLI ISOLATORI DELLA RETE DI TRASMISSIONE"],"dc:type":["info:eu-repo/semantics/doctoralThesis"]},"updated_at":"2026-07-27T20:19:08Z"}