Illinois Pesticide Applicator Practice Test

What is considered the most serious form of dermal exposure to pesticides?

1. Exposure to diluted solutions

2. When pesticides mix with water

3. Contact with pesticides on gloves

4. When oil-based pesticides cross the skin barrier

The correct answer is: When oil-based pesticides cross the skin barrier

The most serious form of dermal exposure to pesticides is when oil-based pesticides cross the skin barrier. This is due to the unique properties of oil-based formulations, which can enhance the absorption of pesticides through the skin. Oil-based pesticides can penetrate the skin more effectively than water-based solutions, leading to a higher potential for systemic exposure and toxicity. In contrast, diluted solutions may have a lower concentration of active ingredients, generally resulting in a reduced risk of harmful effects upon exposure. The mixing of pesticides with water usually pertains to application methods and does not inherently increase the risk of dermal absorption like oil-based formulations do. Contact with pesticides on gloves, while still a concern, primarily poses a risk if proper glove handling and disposal procedures are not followed. Overall, the ability of oil-based pesticides to bypass protective skin barriers increases their hazards, making this form of exposure particularly serious.