Integrated Risk Assessment of Edifenphos and Glyphosate

• Main Authors: Chung-Pei Lee, 李忠沛
• Other Authors: Colin S. Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/39478838188920027599

碩士 === 國立高雄師範大學 === 生物科技系 === 96 === Edifenphos and glyphosate were selceted in this study, to assess risks of consumers, users, and bioacceptors. The dietary risk used the residue limits of pesticides in foods to estimate the hazard index (HI) of pesticides. The exposure risk of pesticide user was conducted by employing OVS-2, α-cellulose pad, gauze mask, and gloves to detect the amount of exposure and estimated the hazard index. For the aquatic ecological risk assessment, concentration of pesticides was estimated by the Fugacity model, then the risk characterization was performed by Aquatic Ecological Risk Assessment (AERA) model which was developed by Water Environment Research Foundation (WERF). In the terrestrial ecological risk assessment, the risk was estimated by risk quotient (RQ) value. The dietary risk indicates that the HI of edifenphos and glyphosate is 0.14 and 0.18, respectively. Rice contains the highest HI posed by edifenphos. Soybeans and wheat contain the highest HI posed by glyphosate. In the exposure risk of user, the average HI of ten farmers posed by edifenphos and glyphosate is 8.69×10-2 and 6.85×10-2, respectively. In the aquatic ecological risk assessment, as the concentration of edifenphos presented in water is 526 μg/L, about 27% aquatic species were affected by acute toxicity effect, and about 40% aquatic species were affected by chronic toxicity effect. When the concentration of glyphosate in water was 4440 μg/L, about 11% aquatic species were affected by acute toxicity effect, and about 20% aquatic species were affected by chronic toxicity effect. Considering the addition of risk, about 16% aquatic species were affected by acute toxicity with 90% of probability, and about 28% aquatic species were affected by chronic toxicity with the same probability. In the terrestrial ecological risk assessment, the RQ value of edifenphos and glyphosate ranged from 6.43×10-4 to 5.92×10-3 and 1.06×10-5 and 2.78×10-3, respectively. Other than aquatic risk posed by edifenphos, there is no potential risk associated with usage of edifenphos and glyphosate.