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. Author manuscript; available in PMC: 2020 Mar 23.
Published in final edited form as: J Occup Environ Hyg. 2019 Mar 14;16(6):387–399. doi: 10.1080/15459624.2018.1559925

Table 1.

Concentrations of metals for total, respirable and NPM fractions of the collected particles in the machining center. The concentrations were calculated by adding concentration multiplied by the corresponding fraction of each of the nanoMOUDI stages.

Element Day 1 Day 2 Day 3
Collected, μg/m3 Respirable, μg/m3 NPM, μg/m3 Collected, μg/m3 Respirable, μg/m3 NPM, μg/m3 Collected, μg/m3 Respirable, μg/m3 NPM, μg/m3
Mn 28.9 27.3 7.8 24.7 23.9 6.8 18.4 17.3 4.8
Fe 190.4 159.4 45.1 151.2 135.3 36.9 137.8 112.4 32.1
Cu 3.1 3.0 0.9 5.1 4.4 1.0 1.3 1.2 1.0
Total 222.4 189.8 53.8 181.1 163.6 44.7 157.4 134.9 37.3

NPM = nanoparticulate matter