Table 2.

Characterization of DEP and APM.

	DEP (a)	APM
Particle size (nm)	mostly <600 nm [36]	approximately 30 nm [31]
Pore diameter (nm)	4−35 nm (b)	approximately 30 nm [31]
Morphology	small irregular agglomerates and roughly spherical [36]	spherical and irregular carbonaceous particles [31]
Raman spectrum	D peak: 1340, G peak: 1600 [37]	D peak: 1340, G peak: 1600 [31]
OC/EC ratio values (c)	1.9 ± 0.001	2.2 ± 0.001

^(a) Diesel exhaust particles, DEP (SRM2975); ^(b) Certified pore diameter in SRM2975; ^(c) Ratios of organic carbon (OC)/elemental carbon (EC).