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Fig. 2. Sorption isotherms for p-nitrocyanobenzene (p-NCB) and 1,4-dinitrobenzene (1,4-DNB) by the K⁺–saturated Webster A horizon soil (WA) and soil fractions: carbonates removed (-CO₃), carbonates and soil OM removed (-CO₃–OM), and the residual sand + silt fraction remaining after removal of carbonates, OM, free FeO_x and clay. Isotherms with different letters (a, b, c) are statistically different at p < 0.05.