Table 2: TSP mass concentrations (8 hr TWA) in personal and area samples from workplace A.

ProcessSampling
site
Sampling dayFilter weight (Before)Filter weight (After)Flow rate (L/min)Sampling time (min)Mass concentration (mg/m3)8 hr TWA (mg/m3)

MWCNT synthesisPersonal-11st0.045240.045352.001 3080.17848 0.11453
2nd0.044690.044931.972 3750.32454 0.25355
3rd0.038560.038671.972 3700.15076 0.11621

SWCNT synthesisPersonal-21st0.045030.045061.995 2440.06163 0.03133

ARC CatalystPersonal-31st0.044960.045012.046 3170.07709 0.05091
2nd0.04470.044821.985 3360.17992 0.12594
3rd0.039050.03921.985 3590.34831 0.25189
Personal-42nd0.044680.044792.042 3560.15132 0.11223
3rd0.038950.038992.042 1630.12018 0.04081

CVD CatalystArea-11st0.044820.044932.020 2930.18585 0.11345
2nd0.038610.038652.001 3700.05403 0.04165
3rd0.038730.038771.950 3170.06471 0.04274
Area-21st0.044780.044927.027 2840.07016 0.04151
2nd0.04490.045086.773 3700.07183 0.05537
3rd0.038790.038866.773 87.20.11852 0.02153
Area-92nd0.038940.039032.010 4380.10223 0.09328
3rd0.038830.0392.026 3750.22376 0.17481

ARC CatalystArea-31st0.044730.044841.953 1720.32746 0.11734
2nd0.044930.045071.960 3800.32109 0.24447
3rd0.038520.038592.001 3700.09455 0.07288
Area-41st0.045130.045246.833 2920.05513 0.03354
2nd0.04470.044867.033 2490.09137 0.04740
3rd0.038930.038987.010 3670.01944 0.01486

In front of
MWCNT equip.
Area-51st0.045130.045192.007 2980.10035 0.06230
2nd0.044540.044652.026 2120.25610 0.11311
3rd0.039010.039031.960 3640.02803 0.02126
Area-61st0.04440.044566.848 2980.07841 0.04868
2nd0.04480.044977.088 3180.07542 0.04997
3rd0.038680.038737.033 1320.05386 0.01481

In front of
SWCNT equip.
Area-71st0.044680.044812.018 1590.40516 0.13421
2nd0.038640.038661.950 3630.02825 0.02137
3rd0.038670.03732.010 131NDND
Area-81st0.044640.044847.328 2650.10299 0.05686
2nd0.044520.044757.010 3650.08989 0.06835

ND: Not detected; changed during the sampling period to avoid overload.