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Table 3 Pearson correlation coefficients (R) and level of significance (p) for DTT activity of species measured within the PM0.15 and PM2.5 size ranges

From: Relationship between redox activity and chemical speciation of size-fractionated particulate matter

Species PM0.15 PM2.5
  R p R p
EC 0.14 0.77 -0.18 0.70
OCa 0.92* 0.01 0.79* 0.05
NO3 -0.63 0.13 -0.81* 0.03
SO4 -0.75* 0.05 -0.80* 0.03
Metals and elements 0.44 0.31 -0.12 0.80
Na -0.66 0.11 0.03 0.95
Mg - - -0.52 0.29
Al -0.10 0.83 -0.67 0.10
Si -0.04 0.93 -0.63 0.13
Cl 0.15 0.75 0.63 0.13
K -0.06 0.89 -0.69 0.09
Ca 0.55 0.20 -0.62 0.14
Ti 0.66 0.11 0.67 0.10
V 0.32 0.53 0.19 0.76
Cr 0.53 0.28 0.86* 0.05
Mn 0.90* 0.01 0.78 0.12
Fe 0.95* < 0.01 0.96* < 0.01
Ni 0.55 0.26 -0.46 0.36
Cu 0.95* < 0.01 0.94* < 0.01
Zn 0.93* < 0.01 0.52 0.23
Br -0.30 0.52 -0.54 0.21
Sr 0.74 0.09 0.70 0.12
Zr 0.80 0.10 0.86 0.06
Sn 0.71 0.18 -0.10 0.87
Ba 0.89* 0.04 0.92* 0.01
Pb 0.95* < 0.01 0.88* 0.02
  1. a Two unrealistic values have been removed from the OC samples, similar to Table 2.
  2. * indicates significance at the p = 0.05 level