Table 5.15 First-order degradation rates (h-1) for sediments in Odderbæk and Lillebæk with a porosity of 0.75 calculated on the basis of the constants of Table 5.14. Pesticide Location ktot [hr-1] Ioxynil Lillebæk 0.019 Ioxynil Odderbæk 0.0068 Pendimethalin Lillebæk 0.55 Pendimethalin Odderbæk 0.060