FIG. 10. Breakthrough curves calculated using the Two Kinetic Sites Model for a 10-cm-long soil column and the following parameters: solute pulse duration = 10 d, q = 5 cm d^–1, = 0.5, = 1 cm, K_d = 1 cm³ g^–1, _b = 1.5 g cm^–3, k_a1 = 1.5 d^–1, k_d1 = 0.5 d^–1, and k_a2 = 0.0, 0.3, and 3.0 d^–1 with k_d2 = 0.0, 0.1, and 1.0 d^–1, respectively.