Which is the pesticide formulation process by which solid particles are dispersed in a liquid?

• A. Emulsion
• B. Solution
• C. Suspension
• D. Foam

Answer: (C)

Solid particles dispersed in a liquid carrier describe a suspension. In pesticide formulations, a suspension means the active ingredient stays as small solid particles spread throughout the liquid rather than dissolving. This is why many products start as a slurry or suspension when mixed with water, with dispersants and suspending agents helping keep particles from clumping or settling too quickly. An emulsion would be droplets of one liquid in another immiscible liquid, not solid particles in a liquid. A solution requires the solid to dissolve at the molecular level, which isn’t the case for many pesticides in water. A foam involves gas dispersed in a liquid. Thus, the process described is a suspension.