FIG. 4. Breakthrough curves calculated using the Uniform Transport Model for a 10-cm-long soil column and the following parameters: q = 5 cm d^–1, = 0.5, and _b = 1.5 g cm^–3; on the left, K_d = 1 cm³ g^–1 and = 0.1, 1, and 10 cm; and on the right, = 1 cm and K_d = 0, 1, and 3 cm³ g^–1.