ABSTRACT
Picloram is released to the environment primarily from its application as a herbicide; however, its use is restricted in the United States. If released to land it will not adsorb to the soil, hydrolyze, or evaporate from soils or surfaces. Picloram is an aromatic amine, and some aromatic amines have been shown to bind to humic materials which may be present in some moist soils; this binding may decrease leaching processes. Picloram has been reported to adsorb moderately to humic substances with the amount adsorbed increasing with decreasing pH. Aromatic amines are known to complex with and be oxidized by clay minerals and humic material; therefore, these processes may affect adsorption of picloram to soils. Exposure to picloram will occur mainly through its manufacture and its use as a herbicide in forests. Dermal exposure route dominated compared to inhalation in a study of applicators even for the mist blower method.
