Following butanol extraction procedure or pesticide contaminated soils, can I freeze dry the solid and liquid portions of the soil for the determination of residual concentration and bioavailable fractions respectively?
The butanol will quickly start to boil under the strong vaccuum combined with freeze drying. This and the vaccuum can lead to significant losses of chemicals.
You should check for the volatility of the pesticides you plan to analyze. You may better evaporate the solvent using a rotavap and/or N2 gas stream.
Use a fume hood to not contaminate the lab with butanol vapour.
I think If you are search for pesticides in soils samples, butanol may be unsuitabale
because of its elkterochemical properties ,specially for sepration some prsticides from soil particles.you may use acetonitrile, methylene chloride ,or a little non polar solvents.
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