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Pesticides in the prevention and control of crop pests, weeds and adjust crop growth played a huge contribution, but pesticide residues not only excessive pesticide residues cause pollution, after picking vegetables and other crops on soil, water system directly affect human health. Pesticides will also be in a long period of time, therefore, on the one hand, need to be developed for environmental protection, pollution-free new pesticides, on the other hand, research efficient, safe removal methods will continue to have a strong practical significance. Based on ultrasound cavitation and acoustic mechanism of chemical effects of ultrasound to remove pesticide residues in vegetables was analyzed theoretically, and explore the chemical effect of ultrasonic cavitation and acoustic parameters of pesticide residues in vegetables removal effect. Vegetable washing testing machine as a test platform, choose the method of field application, picking vegetables in different time periods, grouped as the control treatment, comparative analysis of ultrasonic test results to remove the effects of pesticide residues on vegetables; changing the parameters of the ultrasonic treatment, analysis parameters affect the removal efficiency. The test results show that: bubble removal effect of organophosphorus pesticide residues in vegetables, the overall effect is better than soaked with water; join ultrasonic removal rate has increased significantly different days. With the increase of the ultrasonic power, the vegetables Rogor and dichlorvos removal within a certain range of basic linear increase, but gentle removal rate trends dichlorvos; dimethoate and dichlorvos removal rate with treatment time also increased, but over a certain period of time after the change marginally. Ultrasonic power 600W, and the processing time of 4min, vegetables dimethoate and dichlorvos removal efficiency of 71.23% and 84.64%, respectively. Theory of ultrasonic deworming. Ultrasonic propagation in biological media, and the irradiation amount exceeds a certain threshold value, it will generate the ultrasound biological effects. The ultrasonic at all levels of the biological effects of impact on the performance and structure be hidden in vegetable pests inside, making them feel unwell and will not incapacitate, and ultimately out of the vegetables. Experimental studies have shown that: the ultrasonic pest of cruciferous vegetables, cauliflower and broccoli internal strong repelling effect. When the ultrasonic power was 450W, and the processing time for 4min, cauliflower and broccoli internal pest repelling rates were 93.01% and 97.00%, respectively.
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