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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: J Occup Environ Hyg. 2016 Jan;13(1):30–39. doi: 10.1080/15459624.2015.1072278

Figure 2.

Figure 2

Effect of particle size on the recovery of TiO2 nanoparticles. Digestions were conducted using concentrated H2SO4 (4 mL) and HNO3 (2 mL), ramping temperature up to 210°C in 20 min, holding for 45 min and cooling to room temperature. Error bars represent one standard deviation.