Has a low paraoxonase activity. Also active, but with a lower activity, against other organo-phosphorus insecticides such as Dursban, Coumaphos, pNP-butanoate or parathion. An aryl dialkyl phosphate + H2O = dialkyl phosphate + an aryl alcohol. Binds 1 Co(2+) ion per subunit. Binds 1 Fe cation per subunit. Inactivated by EDTA and o-phenanthroline. Optimum pH is 7.0-9.0. Thermostable. Homodimer. Belongs to the metallo-dependent hydrolases superfamily. Phosphotriesterase family.