Influence of uv radiation on the degration of ethion in pistachio

Ethion is a broad-spectrum pesticide commonly used for control of insects on pistachio (Pistacia vera L.). The extensive use of pesticides on pistachio fruits has raised concerns about pesticide residues.  In this study, used UV radiation and TiO2 photocatalyst as decomposing agent to evaluate the rate of ethion degradation . The experiment in two modes,ethion spray on filter paper and pistachio fruit was conducted. Based on a series of pre-tests, the   Filter papers were treated with ethion,they were exposed to radiation inside the reactor at  appropriate time(5,10 and 20 hour).then pesticide residues were determinded on them.ethion degradation percentage respectively were(9.29,24.77and33.49%)at desired time.Additionally, two UV lamps in absence or presence of TiO2(200 mg/mL) were used to degradade ethion residue from pistachio fruits. All treatments had moderate efficiency for ethion removal from both filter papers and pistachio fruits. The efficiency was positively affected by time of exposure, number of UV light sources, and presence of TiO2. Although, this study showed the potential of UV radiation and TiO2 for ethion degradation from pistachio fruits, further studies are needed to optimize the experimental condition for enhancing the degradation efficiency.