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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4. Results: <strong>PM</strong><strong>2.5</strong> str<strong>on</strong>g acidity<br />
2−<br />
−<br />
+<br />
−<br />
+<br />
[ H ] s<br />
= 2 [ SO4<br />
] + [ NO3<br />
] + [ Cl ] −[<br />
NH<br />
4<br />
] −[<br />
Na ] −[<br />
K<br />
+<br />
+<br />
]<br />
[H + ]s (nmol m -3 )<br />
300<br />
200<br />
100<br />
period I<br />
period II<br />
period III<br />
y = 0.40 x + 12.97<br />
R 2 = 0.62<br />
0<br />
0 100 200 300 400<br />
sulfate (nmol m -3 )<br />
[H+] s<br />
is str<strong>on</strong>gly correlated with sulfate, an expected result<br />
c<strong>on</strong>sider<strong>in</strong>g SO 4<br />
2-<br />
c<strong>on</strong>tributes 84 ± 7% <str<strong>on</strong>g>of</str<strong>on</strong>g> the total ani<strong>on</strong><br />
equivalent c<strong>on</strong>centrati<strong>on</strong>.<br />
10
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