Effect of the household processing on chlorpyrifos removal from Brassica rapa chinensis

• Main Authors: Ching-Han Tsai, 蔡青翰
• Other Authors: Yu-Min Tzou
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/74537400736100336962

碩士 === 國立中興大學 === 土壤環境科學系所 === 105 === In recent years, the food safety issue recently receives much public concerns. According to the Taiwan Food and Drug Administration''s survey in 2013, chlorpyrifos is the top three pesticide residues in Taiwan agricultural products. Chlorpyrifos (O, O-diethyl-O-3,5,6-trichloro-2-pyridyl) is an organic phosphorus insecticide and widely used by farmers, because of its high toxic neurotoxicity to mammals, chlorpyrifos is gradually restrictions in the international community. In this study we use the household treatment to remove the residue of chlorpyrifos on vegetables. The research was divided into two parts (1) investigate the effect of chlorpyrifos concentration changes under the conditions of different temperature, time and sunflower oil ratio in pure water system. (2) To investigate the effect of the household processing on chlorpyrifos removal from Brassica rapa chinensis. The results demonstrate that the concentration of chlorpyrifos affect by the high temperature in the water system, and the degradation rate increases with the high pH value. Add different proportions of sunflower oil to the water system revealed that under the low proportion of sunflower oil, the temperature was still the main reason for the decrease of the concentration of chlorpyrifos but in the case of high proportion, the main reason is sunflower oil. The results of the washing test showed that the effect of the removal of chlorpyrifos on Brassica rapa chinensis was baking soda> sunflower oil> acetic acid> lemon juice. In the blanching test, the best removal condition was adding 10% sunflower oil at 90 degree and blanching for 3 minutes, the removal rate could reach 70%. After blanch , we can see that the proportion of chlorpyrifos, 7 to 10% in the water, 30% residual on the plant, sunflower oil and the other is majority of the proportion, respectively, 28% and 32%, the result shows that the main pathway is sunflower oil and thermal degradation to remove the chlorpyrifos on Brassica rapa chinensis.