The invention discloses a sample
pretreatment method for detection of
organochlorine pesticide residue in food and is characterized by comprising the following steps: water is added to a
food sample, sample solution is swirled, and then inorganic salt and hydrophilic
organic solvent are added to the sample solution, the sample solution is swirled and shaken uniformly, the sample solution undergoes
phase splitting after
centrifugation at
room temperature, the upper-phase liquid is purified through dispersion
solid-phase extraction method, the extraction temperature is 20-30 DEG C, and finally the upper-phase liquid is detected by
gas chromatography; and the
mass percent of the inorganic salt accounts for 5%-35% of the total
mass of the
system, the
mass percent of the hydrophilic
organic solvent accounts for 10%-50% of the total mass of the
system, and water is of the residual amount, and the total mass of the
system is the mass sum of water contained in the sample, the added water, the inorganic salt and the hydrophilic
organic solvent. According to the sample
pretreatment method, a dual-water-phase system consisting of the hydrophilic organic
solvent, the organic salt and water is utilized, the
partition coefficient is increased by means of changing the types and concentrations of the organic
solvent and the inorganic salt, and the
organochlorine pesticide residue in the sample can be directly extracted at
room temperature.