Water-soluble pesticides are more attracted to clay particles than ones that are oil-soluble.

• A. Not sure
• B. Equally
• C. True
• D. False

Answer: (C)

Understanding how pesticides interact with soil particles helps predict their fate. Clay minerals have a very large surface area and carry negative charges, which creates sites where polar, water-soluble pesticides can be attracted through electrostatic interactions and hydrogen bonding. This makes these pesticides more likely to adsorb to clay surfaces. In contrast, oil-soluble pesticides are nonpolar and tend to partition into organic matter rather than mineral surfaces, so their attraction to clay is weaker. Because of this difference in how they interact with soil components, water-soluble pesticides are generally more attracted to clay particles than oil-soluble ones. Keep in mind that actual sorption depends on soil pH, the specific pesticide’s properties, and the soil’s mineralogy and organic matter content.