Adsorbed parathion is subject to degradation by microorganisms and chemical hydrolysis. In orange groves, the half-life of parathion is as long as one month. Usually, it is closer to one-two weeks. Most crops tolerate parathion very well. At temperatures above 120 degrees C, parathion decomposes and may develop enough pressure to cause containers to explode.
Parathion poses a fire and explosion hazard in the presence of strong oxidizers.
Persons who work with organophosphate materials for long periods of time should have frequent blood tests of their cholinesterase levels. Protective clothing must be worn when handling fenthion. Before removing gloves, wash them with soap and water. Always wash hands, face and arms with soap and water before smoking, eating or drinking. After work, remove all work clothes and shoes.