Can anyone help with the purification of a technical pesticide called METHAMIDOPHOS?

It is a material 73% pure and I want to achieve more than 98% purity. I put 20g in an elution column (60cm X 4 cm paked wih KIESELGUR), elute with CH2CL2:ACETONE (2:8) SOLVENT WAS EVAPORATED BUT...

28 November 2013 4,169 5 View