**7. Organochlorine distribution, stability, and degradation**

Although they have been banned many years ago, levels of OC were reported frequently in different studies. They are widespread in both applied environments and in areas far away from their application sites. This is due to high stability, high bioaccumulation capacity, biomagnification, and the ability to spread out of the application site. Generally, these compounds are difficult to degrade. In the soil or sediment environment, the speed of degradation is much smaller. Different degradation mechanisms are known, such as photochemical degradation, thermal degradation, biological degradation, and chemical degradation [7]. Their degradation products are derivatives which in most cases also contain chlorine and exhibit certain toxicity. The study of degradation mechanisms will affect the speeding up of their elimination processes under practical conditions.
