“…The large difference between nominal (e.g., 20 g liter\) and detected concentrations (in this case 1.3 g liter\) of fenvalerate is explained mainly by the rapid adsorption to particulate organic matter (POM) such as plankton (Muir et al, 1985;Hinckley and Bidleman, 1989), to surface films (Crossland, 1982), to macrophytes and animals (Muir et al, 1985;Caquet et al, 1992), and to system walls (Sharom and Solomon, 1981). Photodegradation, chemical hydrolysis, and metabolism in organisms may also contribute to the dissipation of fenvalerate, to a lesser extent (Muir et al, 1985;Caquet et al, 1992).…”