PERMEATION OF METHOMYL IN LANNATE L(TM) THROUGH NITRILE GLOVES

The influence of the inert components on the permeation of methomyl in Lannate L water miscible pesticide formulation through 0.64 mm thick unsupported lined nitrile at 30 degrees C was assessed using an ASTM-t ype permeation cell with isopropanol liquid collection medium. Gas chr omatography/mass spectrometric (GC/MS) analysis of 0.100 ml aliquots o f the collection fluid taken every 10 min revealed that the breakthrou gh time for permeation of methomyl was > 200 min with a steady state p ermeation rate of 5.24 +/- 1.00 mu g cm(-2) min(-1). Reconstituted for mulation with concentrations of methomyl, methanol and isopropanol bei ng those found by direct GC/MS of Lannate L showed that these componen ts did not explain all the permeation kinetic data. (C) 1998 Elsevier Science B.V.