Effect of physicochemical parameters on the adsorption-desorption mechanism of organochlorine pesticides on particulate matter in seawater

Abstract

The kinetic of these processes is rapid, and equilibrium concentrations are achieved in just 3 to 5 hours. Endrin achieves equilibrium concentrations after 20 h in a process described by a kinetic model that distinguishes two components. The four pesticides show linear adsorption and desorption isotherms. The adsorption-desorption reaction is affected by particle concentration, temperature, pH and salinity, showing the existence of more than one simple mechanism. An increase in chitin concentration and in temperature, and a decrease in pH and in salinity resulted in both lower pesticide adsorption and a more reversible process.