Which of the following is a common trait of triazines?

Triazines are a class of herbicides known for their effectiveness in controlling a wide range of weeds. A common trait of triazines is their potential to act as groundwater contaminants. This is particularly crucial since these compounds can leach through the soil and reach groundwater supplies, posing environmental and health risks. Their chemical stability allows them to persist in the environment, which contributes to their mobility and contaminative nature.

In contrast, while triazines can have varying levels of toxicity, they are generally not considered to have high toxicity to humans when used according to label directions. Additionally, they are not classified as highly biodegradable; in fact, many triazines break down slowly in the environment. Lastly, their mobility in soil is significant enough that they can migrate into groundwater, rather than exhibiting low mobility. Thus, the characteristic of being groundwater contaminants is a defining feature of triazines.