Table 5.4 Equilibrium partition coefficients (Kd) for ioxynil and bentazone Nominal CT Kd ± S.D. Koc Pesticide Sediment Conc dpm/L mg/L Exp. type L/kg D.W. L/kg oc pH Ioxynil Lillebæk Low 4090667 0.025 Equilibrium 5.8 ± 0.81 201 7.3 Ioxynil Lillebæk Med 33708833 0.210 Kinetic 5.9 202 - Ioxynil Lillebæk High 45705500 0.285 Equilibrium 0.0 ± 0.05 0 7.3 Ioxynil Odderbæk Low 4090667 0.025 Equilibrium 19.2 ± 2.27 192 7.0 Ioxynil Odderbæk Med 33708833 0.210 Kinetic 19.2 192 - Ioxynil Odderbæk High 45705500 0.285 Equilibrium 7 ± 1.76 67 7.1 Ioxynil Höytiäinen 4°C 34043611 0.212 Equilibrium 8.8 ± 0.24 276 5.6 Ioxynil Kuorinka 4°C 34043611 0.212 Equilibrium 4.8 ± 0.38 291 6.0 Ioxynil Mekrijärvi 4°C 34043611 0.212 Equilibrium 294.6 ± 0.78 1213 5.1 Ioxynil Vaparanta 4°C 34043611 0.212 Equilibrium 1 ± 0.02 186 6.3 Ioxynil Höytiäinen 20°C 32752222 0.204 Equilibrium 7.5 ± 0.18 233 5.9 Ioxynil Kuorinka 20°C 32752222 0.204 Equilibrium 4.7 ± 0.16 289 6.1 Ioxynil Mekrijärvi 20°C 32752222 0.204 Equilibrium 290.7 ± 0.37 1197 5.3 Ioxynil Vaparanta 20°C 32752222 0.204 Equilibrium 0.9 ± 0.01 160 6.5 Bentazone Lillebæk Low 339667 0.46 Equilibrium 0.5 ± 0.00 18 7.3 Bentazone Lillebæk Med 1937333 2.62 Equilibrium 0.5 ± 0.09 17 7.3 Bentazone Lillebæk High 20717000 28.02 Equilibrium 0.5 ± 0.15 17 7.3 Bentazone Odderbæk Low 339667 0.46 Equilibrium 0.9 ± 0.07 9 7.1 Bentazone Odderbæk Med 1937333 2.62 Equilibrium 0.8 ± 0.03 8 7.1 Bentazone Odderbæk High 20717000 28.02 Equilibrium 0.7 ± 0.10 7 7.1 Bentazone Höytiäinen 4°C 2652500 3.588 Equilibrium 0.7 ± 0.01 22 5.7 Bentazone Kuorinka 4°C 2652500 3.588 Equilibrium 0.5 ± 0.16 33 5.9 Bentazone Mekrijärvi 4°C 2652500 3.588 Equilibrium 3.9 ± 0.17 16 5.2 Bentazone Vaparanta 4°C 2652500 3.588 Equilibrium 0.3 ± 0.13 50 6.4 Bentazone Höytiäinen 20°C 2717861 3.676 Equilibrium 0.7 ± 0.04 21 6.0 Bentazone Kuorinka 20°C 2717861 3.676 Equilibrium 0.4 ± 0.04 27 6.1 Bentazone Mekrijärvi 20°C 2717861 3.676 Equilibrium 3.9 ± 0.09 16 5.3 Bentazone Vaparanta 20°C 2717861 3.676 Equilibrium 0.4 ± 0.12 65 6.9 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.