Table 1.

Characteristics of manganese aerosols generated for whole-body exposures in this study (means ± SD)

	Nominal MnSO4 exposure concentration (mg/m3)
	0.18	0.92	4.62a	4.62b
Actual exposure concentration (mg MnSO4/m3)c	0.19 ± 0.01	0.97 ± 0.06	4.55 ± 0.33	4.45 ± 0.35
Geometric mean diameter (μm)d	1.04	1.07	1.12	1.04
Geometric standard deviation (σg)d	1.51	1.54	1.58	1.50
Mass median aerodynamic diameter (μm)e	1.73	1.89	2.12	1.72

^a Cohort 1

^b Cohort 2

^c Based on continuous chamber monitoring with a calibrated optical particle sensor (Real-Time Aerosol Sensors, Model RAM-S, MIE, Inc., Billerica, MA).

^d Based on biweekly aerodynamic particle size spectrometry (Aerodynamic Particle Sizer, Model 3320, TSI, Inc., St. Paul, MN) measurements.

^e Calculated value [56]