The adsorption of the herbicide 14C-atrazine to the marine fungus Dendryphiella salina was studied using sodium azide as an inhibitor of active uptake. Adsorption of atrazine (94 ppb) was found to reach equilibrium within six hours. Adsorption as a function of concentration (9.4 to 468 ppb) conformed to the empirically derived Freundlich equation giving a K value of 6.2. Atrazine on the fungal cell surface was easily desorbed by successive artificial seawater washes indicating a relatively loose binding. The ability of the marine fungus D. salina to remove 14C-atrazine from an artificial seawater medium suggests an environmental role in the transport and redistribution of atrazine in estuaries.
Bibliographical noteFunding Information:
This work was made possible in part by grant number NA-81AA-D-O0040 from the National Oceanic and Atmospheric Administration awarded to the University of Maryland Sea Grant Program. M.J.S. was supported by a Sea Grant Fellowship from University of Maryland Sea Grant Program.