Commodity Fumigation License Practice Exam

How does increased moisture affect fumigation penetration?

1. It increases penetration

2. It has no effect

3. It reduces penetration

4. It varies with the fumigant

The correct answer is: It reduces penetration

Increased moisture significantly impacts fumigation penetration by reducing it. Fumigation relies on the movement of gas through the target commodity, and the presence of excessive moisture in the materials can create physical barriers that hinder this movement. Water molecules can occupy spaces in the commodity, making it more dense and thereby obstructing the pathways that the fumigant needs to travel through. Additionally, moisture can lead to the formation of a film on the surface of the commodity, further limiting the fumigant's ability to penetrate adequately. Humidity can also affect the reactivity and volatility of the fumigant itself. Certain fumigants may become less effective or may not disperse evenly when there is a high moisture content. This combination of physical barriers created by moisture and potential chemical interactions means that over-saturated conditions can diminish the efficacy of the fumigant, making it crucial to consider moisture levels when planning a fumigation process.