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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L<strong>in</strong>ear Regressi<strong>on</strong>:<br />
us<strong>in</strong>g NH 4+ /SO 4<br />
2-<br />
and RH to describe <strong>in</strong>-situ <str<strong>on</strong>g>pH</str<strong>on</strong>g><br />
<str<strong>on</strong>g>pH</str<strong>on</strong>g><br />
IS<br />
= 1.34 R<br />
/<br />
+ 3.25 RH − 54.24<br />
N<br />
S<br />
Calculated <str<strong>on</strong>g>pH</str<strong>on</strong>g> IS us<strong>in</strong>g regressi<strong>on</strong><br />
l<strong>in</strong>e<br />
5<br />
4<br />
3<br />
2<br />
1<br />
0<br />
-1<br />
-2<br />
-3<br />
(b) L<strong>in</strong>ear regressi<strong>on</strong> variables: R N/S and RH<br />
high nitrate<br />
episode<br />
y = 0.75 x - 0.01<br />
R 2 = 0.75<br />
-3 -2 -1 0 1 2 3 4 5<br />
R +/- is a more<br />
suitable<br />
parameter than<br />
R N/S to<br />
describe <str<strong>on</strong>g>pH</str<strong>on</strong>g> IS .<br />
17<br />
AIM-derived <str<strong>on</strong>g>pH</str<strong>on</strong>g> IS