Table E.1 The activity of pendimethalin solution when dispensed by either plastic or glass pipettes Cw Cw dpm/mL dpm/mL High concentration Glass Plastic 1 24138 23506 2 25023 23379 3 23694 23858 average 24285 23581 Low concentration Glass Plastic 1 11567 11480 2 11919 11632 3 11832 11388 average 11772 11500