Methyl Parathion Health and Safety Guide - Health and Safety Guide 75

Pure methyl parathion is crystalline and white. It is relatively insoluble in water, poorly soluble in petroleum ether and mineral oils, and readily soluble in most organic solvents. Methyl parathion is stable at pH 1-7, but undergoes rapid decomposition in alkaline media at pH 8-9. On heating, methyl parathion readily isomerizes to the 0,S-dimethyl analogue.