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Fig. 4. Sorption/desorption isotherms of pesticides in reference smectite clays (SWy-2, SAz-1) and the corresponding humic acid (HA)-clay complexes: 4,6-dinitro-o-cresol in (A) K-SWy-2, (B) K-HA-SWy-2a, (C) Ca-SWy-2, (D) Ca-HA-SWy-2b; and dichlobenil in (E) K-SWy-2, (F) K-HA-SWy-2a, (G) Ca-SAz-1, (H) Ca-HA-SAz-1.
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