The dissipation of ethoprophos and tricyclazole in soil and their translocation tendency to spinach were investigated. Prior to field trials, the analytical method for the determination of these pesticide residues was optimized and validated on soil and spinach. The field trial was conducted under greenhouse conditions for two different pretreatment periods with the pesticides. After treating with pesticides 30 (PBI-30) and 60 days (PBI-60) before seeding, soil samples were collected on different days for the dissipation study of soil. Spinach samples were harvested from the soil, and 50% and 100% mature spinach samples were collected. The initial amounts of ethoprophos residue in the PBI-60 and PBI-30 soils were 0.21 and 2.74 mg/kg, respectively, and these both decreased to less than 0.01 mg/kg on the day of spinach harvest. Similar initial residues of tricyclazole were observed in the PBI-60 (0.87 mg/kg) and PBI-30 soils (0.84 mg/kg), and these decreased to 0.44 and 0.34 mg/kg, respectively. The half-lives of ethoprophos in the soils were calculated as 7.6 and 4.8 days, respectively, while relatively long half-lives of 36.5 and 77.0 days were calculated for tricyclazole. According to the pesticide residue amounts in the spinach, the translocation rate from the soil to the spinach was determined. In the case of ethoprophos, the residual amount was already rapidly degraded in the soil, and the translocation rate could not be confirmed. On the other hand, for tricyclazole, it was confirmed that 1.19 to 1.61% of the residual amount in soil was transferred to spinach. According to these results, safe management guidelines for tricyclazole in soil were suggested considering the maximum residue limit on spinach.

中文翻译：

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残留的乙草磷和三环唑从土壤转移到菠菜

研究了乙草磷和三环唑在土壤中的消散及其向菠菜的易位趋势。在田间试验之前，在土壤和菠菜上对测定这些农药残留的分析方法进行了优化和验证。田间试验在温室条件下用农药进行了两个不同的预处理阶段。在播种前30天（PBI-30）和60天（PBI-60）用杀虫剂处理后，在不同天数收集土壤样品进行土壤消散研究。从土壤中收获菠菜样品，并收集50%和100%的成熟菠菜样品。PBI-60 和 PBI-30 土壤中乙原磷残留的初始量分别为 0.21 和 2.74 mg/kg，在菠菜收获当天，这两者均降至低于 0.01 mg/kg。在 PBI-60 (0.87 mg/kg) 和 PBI-30 土壤 (0.84 mg/kg) 中观察到类似的三环唑初始残留量，分别降至 0.44 和 0.34 mg/kg。计算得出的土壤中乙草磷的半衰期分别为 7.6 天和 4.8 天，而三环唑的半衰期相对较长，分别为 36.5 天和 77.0 天。根据菠菜中农药残留量，确定土壤向菠菜的易位率。以乙草胺为例，残留量已经在土壤中迅速降解，无法确定易位率。另一方面，对于三环唑，已确认土壤中残留量的 1.19% 至 1.61% 转移到菠菜中。根据这些结果，