Water is removed from the ethyl acetate fraction on an anhydrous sodium sulfate column.
The mean recoveries of all analytes and surrogates determined at 0.74 to 0.82 micrograms per liter in reagent water and in soil pore water were 94 percent and 98 percent, respectively. The mean recoveries of all analytes and surrogates determined at 7.4 to 8.2 micrograms per liter in reagent water and in soil pore water were 96 percent and 97 percent, respectively.