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Comparison between the recovery of TiO2, TiO2 spiked PVC filters and MCE filters. The spiking was conducted using 4 nm TiO2 nanoparticles at 36 μg/per filter and 360 μg/filter. Acid mixture: conc. H2SO4 (4 mL) and conc. HNO3 (2 mL). Digestion temperature = 210°C. Ramp time = 20 minutes. Hold time = 45 min.
