Figure 4From: A dose-controlled system for air-liquid interface cell exposure and application to zinc oxide nanoparticles Comparison of quartz crystal and gravimetric microbalance. Measurement of the mass deposited on the bottom plate of the ALICE by QCM and gravimetric analysis after nebulization of 1-5 mL of (NH4)2SO4, NaCl, carbon black and ZnO solutions/suspensions with concentrations ranging between 2-10% (salts) and 0.1-2% (carbon black and ZnO nanoparticles). The (dry) mass per surface area as determined by QCM and gravimetry showed excellent linearity (R2 = 0.962) and agreement within 7.3% (slope) over the investigated range from 3 to 160 μg/cm2.Back to article page