Estimation of In Situ pH on PM 2.5 in Hong Kong Using Online Ionic ...
Estimation of In Situ pH on PM 2.5 in Hong Kong Using Online Ionic ...
Estimation of In Situ pH on PM 2.5 in Hong Kong Using Online Ionic ...
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1. <str<strong>on</strong>g>In</str<strong>on</strong>g>troducti<strong>on</strong>:<br />
Def<strong>in</strong>iti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> Particle Acidity<br />
Str<strong>on</strong>g<br />
Acidity<br />
[H + ] s<br />
: total amount <str<strong>on</strong>g>of</str<strong>on</strong>g> H+ nmol m -3 <str<strong>on</strong>g>of</str<strong>on</strong>g> air,<br />
measured either by titrati<strong>on</strong> or by <str<strong>on</strong>g>pH</str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> the<br />
aerosol extract <strong>in</strong> an aqueous soluti<strong>on</strong>.<br />
.<br />
Free<br />
Acidity<br />
The actual amount <str<strong>on</strong>g>of</str<strong>on</strong>g> [H + ] <strong>in</strong> the aqueous<br />
phase <str<strong>on</strong>g>of</str<strong>on</strong>g> particles <strong>in</strong> nmol m -3 <str<strong>on</strong>g>of</str<strong>on</strong>g> air;<br />
Estimated by thermodynamic models (e.g.,<br />
AIM-III ) *<br />
<str<strong>on</strong>g>In</str<strong>on</strong>g>-situ<br />
<str<strong>on</strong>g>pH</str<strong>on</strong>g><br />
<str<strong>on</strong>g>pH</str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> the particle aqueous phase; Calculated<br />
from parameters estimated by AIM-III<br />
3<br />
*: available at: www.aim.env.uea.ac.uk/aim/aim.php/
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