Каталог пестицидов - PPDB

NHELP

Koc, Kfoc, коэффициент распределения органического углерода, organic-carbon sorption constant. Chemicals vary in how well they are adsorbed to soil particles. Koc /Kfoc measures the affinity for pesticides to sorb to organic carbon. The higher the value, the stronger the tendency to attach to and move with soil. Koc / Kfoc values greater than 1000 indicate strong adsorption to soil. Chemicals with lower Koc / Kfoc values (less than 500) tend to move more with water than be adsorbed to sediment. Some pesticides are strongly bound to other soil components such as clay surfaces. For some pesticides Koc/ Kfoc will be very pH sensitive.