The possibilities of gas chromatography mass spectrometry for determining of organochlorine compounds content in chemical reagents are shown . The optimal operating conditions of the chromato mass spectrometer and the optimal solvent for extraction- isooctane were selected using the example of organochlorine compounds ( model mixture analysis. Calibration curves were constructed for each individual organochlorine compound at selected ion monitoring (SIM) mode. Different approaches to sample preparation based on dilution and/or extraction are proposed depending on the physico-chemical characteristics of chemical reagents. For the analysis of chemical reagents having a strong hydrocarbon background in the full ion current scanning mode, the identification of organochlorine compounds and subsequent quantitative determination were carried out by using mass fragmentograms. To estimate the efficiency of the technique, the completeness of extraction was assessed by adding a so-called "marker" to the working sample and evaluating the results by the value of the extraction degree.
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