Most nebulizers use pressurized gas, typically argon or compressed air, to break a liquid stream into tiny droplets. These droplets form a stable aerosol that instruments can process. The aerosol travels into the analytical instrument, such as an inductively coupled plasma (ICP) torch or an atomic absorption spectrometer.
There, the droplets are further broken down and atomized for measurement. The design of a nebulizer strongly affects how efficiently the sample reaches the detector and how sensitive the resulting measurement is. Pneumatic nebulizers use gas pressure to shear the liquid into droplets and are the most common type in ICP instruments.
Ultrasonic nebulizers instead use a vibrating piezoelectric crystal to generate a finer, more uniform aerosol. This can improve sensitivity for some applications but adds instrument complexity. Nebulizers are also used outside the laboratory, most notably in medicine.
A similar device converts liquid medication into an inhalable mist for patients with asthma or other respiratory conditions. In analytical chemistry, choosing the right nebulizer type depends on the sample matrix. Viscous or high-solid samples may require specialized designs to avoid clogging or inconsistent droplet size. Smaller, more uniform droplets generally reach the plasma or flame more efficiently, improving both sensitivity and precision.