Studies On The Determination Of Pesticide Residues By Gas Chromatography Mass Spectrograph

For the vast and irrational use of pesticide, the problem of pesticide residues becomes more and more remarkable, especially the pesticide residues in food and medicine. The safety of food has become an important means of trade protection, so it is necessary for us to establish a systemic multi-residues method for the determination of pesticides and improve detecting skills in order to ensure the export of our fruits and vegetables and detect new pesticide residues in fruit imports. In addition, it is necessary to establish a system which is to detect the pesticide residues in lab, forbid the fruits and vegetables which overrun the limitation entering the market and ensure the safety of people's consumption of fruits and vegetables. Besides, pesticide residues are affecting the quality of Chinese traditional medicine, especially the export, so it is essential to establish a quick and exact determinate method.In this paper, 107 pesticides were chosen to be studied which are used in the procedure of fruits and vegetables' production in our country and set a limit in China and the mainly export countries. GC-MS was introduced and a database of MS was established. The extracting and cleaning up course and the parameters of GC-MS, GC-ECD, GC-NPD and GC-FPD were optimized. The result proves that the recovery and precision tests are accordant with relational regulations and the minimum detection limits are accordant with maximum residue limits which are provided by the provision of FAO/WHO and Chinese standard. The method applies a same course to extract, clean up and detect 107 pesticide residues, so it can reduce experimental time and cost and has a capacity to quickly filtrate and exactly corroborate simultaneously. As a whole, it is advanced even if it is match with international technique. Besides, a determinate method was established to detect nine organochlorine pesticide residues, including BHC and isomer, DDT and isomer and PCNB in seven Chinese traditional medicines by capillary gas chromatography. The result proves that the recovery and precision tests are accordant with relational regulation and the method can quickly and exactly detect pesticide residues.