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  1. Those of you who work in analytical laboratories and work extracting analytes from soil samples: Many procedures involve spiking a soil sample first with various standards, shaking the soil sample, THEN adding a solvent like methanol or acetone to break up the sample matrix and remove moisture. My question is, does it make any difference whether or not you spike first or add the acetone/methanol first? Does either one result in better recoveries? Why? I know one other procedure for PCB/PAH compounds has the soil samples sitting in methanol already, after which it is simply spiked an
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