Workplace Exposure to Titanium Dioxide Nanopowder Released from a Bag Filter System

Table 1

Aerosol detectors used in this study.

	Specifications of instrument	Main set	Subset	Portable aerosol detector
Particle size distribution	10–420 nm	SMPS (Nanoscan, TSI 3910)
	<10^6 particles/cm^3
	0.25–32 μm	OPC (portable aerosol spectrometer, Grimm 1.109)	OPC (portable aerosol spectrometer, Grimm 1.109)
	<2 × 10^6 particles/L
Particle number concentration	10–700 nm			Discmini; (Matter Aerosol)
	<10^6 particles/cm^3 @20 nm
	<5 × 10^5 particles/cm^3 @100 nm
Lung-deposited surface area	10–1,000 nm	NAM; (TSI AeroTrak 9000)	NAM; (TSI AeroTrak 9000)
	<10^4 μm^2/cm^3 for A mode
SEM		Filter sampler; (pore size 100 nm)