Table 1 The average organic nitrates obtained from NOx+ ratio method, unconstrained PMF, and ME2 method in different seasons
From: Comparative analysis of methods for seasonal particulate organic nitrate estimation in urban areas
Spring | Summer | Autumn | ||
|---|---|---|---|---|
Total NO3-,org /μg/m3 (%1) | Estimated | 0.79 ± 0.45 (20.6%) | 0.43 ± 0.37 (14.6%) | 0.91 ± 0.80 (28.2%) |
Estimated-upper limit | 1.92 ± 1.10 (50.0%) | 1.04 ± 0.91 (35.3%) | 2.23 ± 1.97 (69.0%) | |
Estimated-lower limit | 0.28 ± 0.16 (7.3%) | 0.15 ± 0.13 (5.1%) | 0.33 ± 0.29 (10.2%) | |
PMF | 0.32 ± 0.23 (8.3%) | 0.17 ± 0.18 (5.8%) | 0.42 ± 0.36 (13.0%) | |
ME2 | 0.31 ± 0.21 (8.1%) | 0.34 ± 0.29 (11.6%) | 1.01 ± 0.90 (31.3%) | |
HOA- NO3-,org /μg/m3 | PMF | 0.21 ± 0.18 | 0.17 ± 0.18 | 0.03 ± 0.03 |
ME2 | 0.21 ± 0.17 | 0.22 ± 0.25 | 1.59E-07 ± 1.92E-07 | |
COA- NO3-,org /μg/m3 | PMF | 0.001 ± 0.002 | 2.19E-08 ± 2.72E-08 | 0.01 ± 0.01 |
ME2 | 0.01 ± 0.02 | 0.04 ± 0.05 | 3.57E-06 ± 3.59E-06 | |
LO-OOA- NO3-,org /μg/m3 | PMF | 0.04 ± 0.06 | 3.52E-05 ± 3.16E-05 | 0.004 ± 0.004 |
ME2 | 0.02 ± 0.03 | 0.03 ± 0.03 | 0.62 ± 0.77 | |
MO-OOA- NO3-,org /μg/m3 | PMF | 0.07 ± 0.05 | 1.39E-07 ± 8.83E-08 | 0.38 ± 0.35 |
ME2 | 0.07 ± 0.05 | 0.05 ± 0.03 | 0.38 ± 0.25 | |
