Table 1 Mass concentration, chemical composition and DTT activity of different PM size ranges in four sampling locations (nmol min-1 μg-1).
From: Relationship between redox activity and chemical speciation of size-fractionated particulate matter
Size Mode | Sampling Period | Location | Mass (μg m-3 | EC (%) | OC (%) | NO3 (%) | SO4 (%) | Metals &Elements (%) | DTT activity (nmol min-1 μg-1) |
|---|---|---|---|---|---|---|---|---|---|
PM0.15 | June 2003 | Downey | 5.0 | 5.0 | 41.0 | 6.5 | 16.0 | 20.4 | 0.061 |
| Â | July 2003 | Downey | 5.9 | 2.0 | 41.0 | 4.9 | 17.6 | 31.1 | 0.083 |
| Â | July 2003 | Riverside | 7.6 | 2.0 | 29.0 | 13.0 | 21.0 | 27.0 | 0.052 |
| Â | August 2004 | Riverside | 7.6 | 3.7 | 43.8 | 17.1 | 9.1 | 6.7 | 0.053 |
| Â | Sept. 2004 | Caldecott B1 | 24.5 | 20.5 | 47.3 | 1.6 | 4.3 | 13.1 | 0.111 |
| Â | Sept. 2004 | Caldecott B2 | 0.6 | 10.5 | 74.7 | 1.9 | 4.9 | 27.7 | 0.172 |
| Â | January 2005 | CA-110 | 3.8 | 24.0 | 178.0 | 42.7 | 22.8 | 4.5 | 0.042 |
PM2.5 | June 2003 | Downey | 17.6 | 2.0 | 18.0 | 24.0 | 6.5 | 31.0 | 0.036 |
| Â | July 2003 | Downey | 43.6 | 1.0 | 32.0 | 21.0 | 7.0 | 36.0 | 0.021 |
| Â | July 2003 | Riverside | 27.9 | 2.0 | 22.0 | 34.0 | 9.4 | 30.3 | 0.027 |
| Â | August 2004 | Riverside | 26.9 | 2.0 | 22.0 | 34.0 | 9.4 | 30.3 | 0.028 |
| Â | July 2005 | Riverside | 22.1 | 1.3 | 24.5 | 14.6 | 10.9 | 31.0 | 0.026 |
| Â | Sept. 2004 | Caldecott B1 | 36.7 | 4.8 | 48.9 | 3.3 | 3.3 | 26.8 | 0.068 |
| Â | Sept. 2004 | Caldecott B2 | 15.4 | 2.7 | 41.8 | 0.9 | 2.1 | 24.1 | 0.075 |
| Â | January 2005 | CA-110 | 14.9 | 25.8 | 148.0 | 39.7 | 15.3 | 9.9 | 0.025 |
Coarse | Sept. 2004 | Caldecott B1 | 0.5 | 1.2 | 37.7 | 3.3 | 2.7 | 42.6 | 0.019 |
| Â | Sept. 2004 | Caldecott B2 | 0.7 | 0.4 | 14.0 | 0.6 | 2.2 | 52.8 | 0.032 |
| Â | January 2005 | CA-110 | 8.3 | 0.4 | 21.1 | 3.5 | 1.4 | 22.9 | 0.017 |