College of Science, China Agricultural University, Beijing 100193, China.
College of Science, China Agricultural University, Beijing 100193, China.
Food Chem. 2019 Nov 15;298:125007. doi: 10.1016/j.foodchem.2019.125007. Epub 2019 Jun 13.
In this study, the ultrasonic dishwasher was used to remove five pesticides known to be frequently used on rape and grape. As compared with normal water washing, washing with the ultrasonic dishwasher was demonstrated to be more effective for pesticides removal, achieving removal rates between 14.7% and 59.8% on rape, and between 72.1% and 100% on grape. However, there were significant differences in order of the removal rate of five pesticides on rape and grape. From the adsorption experiments and analysis via Freundlich equation, the adsorption index (n, 0.551-1.056 on rape and 0.362-1.478 on grape) and adsorption coefficient (K, 10-10 and 10-10 (mg·dm)/(mg·L) on rape and grape) were obtained. Taken together with the observation of the matrix surface by scanning electron microscopy and the evaluation of the physicochemical properties of pesticides, the different pesticides removal may be related to surface structure of the matrix.
本研究采用超声波洗碗机去除油菜和葡萄上常用的五种农药。与普通水清洗相比，超声波洗碗机清洗更有效地去除农药，对油菜的去除率在 14.7%至 59.8%之间，对葡萄的去除率在 72.1%至 100%之间。然而，五种农药在油菜和葡萄上的去除率顺序存在显著差异。通过吸附实验和 Freundlich 方程分析，得到了吸附指数（n，油菜上为 0.551-1.056，葡萄上为 0.362-1.478）和吸附系数（K，油菜和葡萄上均为 10-10 和 10-10(mg·dm)/(mg·L)）。结合扫描电子显微镜对基质表面的观察和对农药理化性质的评价，不同的农药去除可能与基质的表面结构有关。
