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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2016

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Assessing the contribution of water to the mass closure of PM10

Anno di pubblicazione: 2016

Formato: Cartaceo

Autori: Perrino, C.; Catrambone, M.; Farao, C.; Canepari, S.

Affiliazioni autori: CNR; Sapienza Univ Rome

Autori CNR:

  • CINZIA PERRINO

Lingua: inglese

Abstract: The data obtained during a number of field studies aimed at determining the chemical composition of atmospheric particulate matter (PM) have shown that the measurement of the main PM components (main elements, ions, elemental carbon, organic carbon) was generally sufficient to obtain a reasonable mass closure. Notwithstanding, a wide gap between PM mass concentration and reconstructed mass was observed in two peculiar environmental conditions: desert dust intrusion and severe atmospheric stability episodes characterized by very high ammonium nitrate concentration. In these two cases, the mass closure improved significantly by adding the concentration of PM bound water. Water was determined by using a coulometric Karl Fisher system equipped with a controlled heating device; the method was able to separate different water contributions released in different temperature ranges from 50 to 250 degrees C.

Lingua abstract: inglese

Altro abstract: In our field studies the amount of water associated to ammonium salts in winter stability conditions was mostly dependent on ammonium nitrate concentration and constituted up to 22% of the total PM10 mass; the specific water contribution linked to ammonium salts (released in the temperature range 180 250 degrees C) constituted up to 30% of the ammonium nitrate mass. It was confirmed that in these extreme conditions quartz and Teflon filters behave differently: when measured on quartz filters, PM concentration was lower than on Teflon, the mass closure was satisfactory and the concentration of water was presumably very low.

Pagine da: 555

Pagine a: 564

Pagine totali: 10

Rivista:

Atmospheric environment Pergamon.
Paese di pubblicazione: Regno Unito
Lingua: inglese
ISSN: 1352-2310

Numero volume: 140

DOI: 10.1016/j.atmosenv.2016.06.038

Referee: Sė: Internazionale

Stato della pubblicazione: Published version

Indicizzato da: ISI Web of Science (WOS) [000380083200051]

Parole chiave:

  • PM-bound water
  • Atmospheric stability
  • Desert dust
  • Ammonium nitrate
  • PM macro-sources

Strutture CNR:

 
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