Figures & data
FIG. 1 Mean particle size distribution of DPM aerosols generated in the Marple chamber under three engine load conditions (5, 30, and 80%): (a) low mass concentration level; (b) high mass concentration level. (Color figure available online.)
TABLE 1 Sampling time and mass concentration of DPM aerosols generated in the Marple chamber during the study
TABLE 2 Mean particle size and number concentration for DPM aerosols generated in the Marple chamber under different conditions
FIG. 2 TEM photomicrographs of DPM generated in the Marple chamber under three engine load conditions: (a) 5%, (b) 30%, and (c) 80%.
FIG. 3 Specific surface area (SSA) of DPM aerosols generated in the Marple chamber under different conditions. The SSA is based on the mass concentration obtained by the TEOM. (Color figure available online.)
TABLE 3 Surface area and mass concentration of DPM aerosols measured with different instruments and techniques. Specific surface area (SSA) concentration obtained using the total real-time mass concentration (TEOM) and the surrogates (EC, TC) generally employed in mining environments to assess exposure to DPM
FIG. 4 Specific number concentration (SNC) of DPM aerosols generated in the Marple chamber under different conditions. The SNC is based on the mass concentration obtained by the TEOM. (Color figure available online.)
TABLE 4 Specific number concentration (SNC) obtained using the mass concentration surrogates (EC, TC) generally employed in mining environments to assess exposure to DPM
FIG. 5 The new metric approach presented with different SSA and SNC inputs data: (a) specific NSAM surface area (TC); (b) specific NSAM surface area (EC); (c) specific number concentration (TC); and (d) specific number concentration (EC). (Color figure available online.)
