Table 5.3 Equilibrium partition coefficients (Kd) for pendimethalin Nominal CT Kd ± S.D. Koc Pesticide Sediment Conc dpm/L mg/L Exp. type L/kg D.W. L/kg oc pH Pendimethalin Pond Low 7848222 0.064 Kinetic 615 18647 - Pendimethalin Pond High 16189889 0.132 Kinetic 551 16700 - Pendimethalin Pond Low 7503452 0.061 Kinetic desorp 832 25218 - Pendimethalin Pond High 15517620 0.126 Kinetic desorp 811 24579 - Pendimethalin Lillebæk Low 2952667 0.024 Equilibrium 610 ± 51 21050 7.3 Pendimethalin Lillebæk Med 7656389 0.062 Equilibrium 432 ± 14 14914 7.3 Pendimethalin Lillebæk High 9757167 0.079 Kinetic 224 7712 - Pendimethalin Odderbæk Low 2952667 0.024 Equilibrium 2074 ± 98.1 20739 7.1 Pendimethalin Odderbæk Med 7656389 0.062 Equilibrium 1183 ± 26.8 11831 7.1 Pendimethalin Odderbæk High 9757167 0.079 Kinetic 544 5446 - Pendimethalin Vaparanta v. low 845184 0.0056 Kinetic 50.5 9351 - Pendimethalin Vaparanta Low 1380244 0.011 Kinetic 49.2 9108 - Pendimethalin Vaparanta Med 2760489 0.022 Kinetic 44.5 8238 - Pendimethalin Vaparanta High 5520978 0.045 Kinetic 31.5 5840 - Pendimethalin Vaparanta v. high 11041956 0.090 Kinetic 36.7 6788 - Pendimethalin Höytiäinen 4°C 10189444 0.083 Equilibrium 379 ± 6.7 11841 5.4 Pendimethalin Kuorinka 4°C 10189444 0.083 Equilibrium 302 ± 37.5 18436 5.8 Pendimethalin Mekrijärvi 4°C 10189444 0.083 Equilibrium 2518 ± 6 10371 5.0 Pendimethalin Vaparanta 4°C 10189444 0.083 Equilibrium 77 ± 0.8 14267 6.2 Pendimethalin Höytiäinen 20°C 11016389 0.090 Equilibrium 344 ± 18.4 10741 5.8 Pendimethalin Kuorinka 20°C 11016389 0.090 Equilibrium 306 ± 5.3 18638 6.0 Pendimethalin Mekrijärvi 20°C 11016389 0.090 Equilibrium 2621 ± 18.1 10795 5.2 Pendimethalin Vaparanta 20°C 11016389 0.090 Equilibrium 78 ± 3.6 14487 6.4 Kd from kinetic experiments is calculated from fitted sorption and desorption rates while Kd for equilibrium experiments is an average of Kds calculated for replicates. Koc values have been calculated as Kd/foc. pHs given are in the test glasses after equilibration. Kd fra de kinetiske forsøg er udregnet ud fra “fittede” sorptions- og desorptionshastigheder, mens Kd for ligevægtsforsøg er et gennemsnit af Kd værdier udregnet for replikater. Koc værdier er udregnet som Kd/foc. pH værdierne er fra testglassene efter ligevægt.