Which mixing order follows the addition of surfactants and penetrants?

The correct answer is that adding surfactants and penetrants typically follows the seventh mixing order. This sequencing is critical in pesticide formulation because it helps maximize the efficacy of the active ingredients when mixed with water and other additives.

In this order, surfactants are introduced after the initial mixing of the active ingredients and liquid carrier. Surfactants lower the surface tension of the mixture, allowing for better adherence and spreading on the target surfaces. Penetrants, which help the pesticide penetrate into plant tissue or other surfaces, are included subsequently to ensure that they can effectively enhance the overall performance of the pesticide.

Following this specific order helps prevent potential chemical reactions or compatibility issues that could arise if ingredients are not added in the correct sequence. It ensures that all components can work together efficiently without compromising the effectiveness of the pesticide application.