The effect of ultraviolet rays on the degradation and removal of metasystox and fenitrothion pesticides from pistachio crop

Pistachio is one of the most important agricultural products of the country.  It is extremely important and accounts for about 81 percent of the country's non-oil revenues. In this study, the degradation of two pesticides, metacystox and fenitrithion was investigated by ultraviolet radiation. These three pesticides are commonly used in a wide range in pistachio gardens in the country. One of the most important agricultural and plant protection tasks is to produce safe crops with residual pesticides below the MRL level. The aim of this study was to investigate the effect of UV radiation combined with the photocatalytic effect of titanium dioxide and hydrogen peroxide on the degradation of these two pesticides in pistachio products.The samples were extracted by LLE method and determinated by GC-MS. Exposur times were 30, 60,120 and 300 minutes.The results showed that the highest percentage of degradation of pesticides was related to metasystox and affected by uv / H2O2 at 38.5%. The optimum time in all trials was 300 min. UV irradiation alone at 300 min time on metasistox and fenitrothion in pistachio reduced the toxin by 24/2and 17/1, respectively.Experiments showed that degradation of the studied toxins was possible using UV irradiation and the destructive effect of UV on chemical structures was proved in experiments. Therefore, UV radiation in a specific dose can remove residues of pistachio pesticides. Combined with UV agents, hydrogen peroxide and titanium dioxide can more effectively remove contamination from agricultural products.