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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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Validati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> PILS measurements<br />

SO 4<br />

2-<br />

*<br />

NH 4+<br />

*<br />

NO 3<br />

-#<br />

K + *<br />

slope<br />

R 2<br />

slop<br />

e<br />

R 2<br />

slop<br />

e<br />

R 2<br />

slope<br />

R 2<br />

slope<br />

R 2<br />

slope<br />

R 2<br />

Chang<br />

(2007)<br />

1.05<br />

1.02<br />

0.59<br />

0.89<br />

1.18<br />

1.06<br />

0.56<br />

0.58<br />

3.56<br />

3.16<br />

0.65<br />

0.80<br />

4.91<br />

4.03<br />

0.07<br />

0.46<br />

Cl -# 0.98<br />

1.00<br />

0.05<br />

Na +# 0.77<br />

1.18<br />

1.05<br />

0.56<br />

0.90<br />

Ors<strong>in</strong>i<br />

(2003)<br />

1.03<br />

0.96<br />

0.93<br />

0.88<br />

0.32<br />

0.22<br />

Hogrefe<br />

(2004)<br />

0.71-<br />

2.37<br />

0.42<br />

-0.96<br />

1.05<br />

0.94<br />

This<br />

study<br />

1.04<br />

0.97<br />

1.06<br />

0.92<br />

1.16<br />

0.96<br />

0.82<br />

0.97<br />

0.93<br />

1.04<br />

*:No. <str<strong>on</strong>g>of</str<strong>on</strong>g> comparis<strong>on</strong>= 29; # : No. <str<strong>on</strong>g>of</str<strong>on</strong>g> comparis<strong>on</strong>= 8.<br />

8

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