to the bottle containing the soil the bottle was then sealed with a lid and shaken manually for approximately 15 minutes following such treatment the soil was moistened with 20 ml of deionized water the bottle was then covered with a watch glass to maintain aerobic conditions and to prevent rapid soil drying and placed in a controlled environmental chamber in darkness where the temperature was maintained constant at 25 u00b0 c four days later the bottle was removed from the environmental chamber and 25 ml of water and 100 ml of toluene were added the bottle was then tightly sealed with a lid containing a cellophane liner and vigorously shaken on a variable speed reciprocating shaker eberbach corp model 6000 set at approximately 200 excursions per minute for one hour after shaking the bottle contents were allowed to settle and a 10 ml aliquot of toluene was transferred by pipette into a glass vial and sealed with a polyseal cap the toluene extract was analyzed for herbicidal content by gas chromatography the chromatogram data was then converted to equivalent soil concentrations in parts per million ppm by weight of the herbicide the results are shown in the table below where the compounds of examples 1 and 2 were tested according to the above procedure a control run without an extender compound was conducted to show how the drop in herbicide concentration was effected by each extender compound in each case.