CAJ | 학술논문

为探讨噻虫嗪在Fe2+/S2O2-8/S2O2-3体系下降解情况，首先通过单因素实验研究了不同Fe2+、S2O2-8和S2O2-3浓度对噻虫嗪降解率的影响，然后通过中心复合实验，研究各单因素之间的相互影响，得出了Fe2+/S2O2-8/S2O2-3体系下Fe2+、S2O2-8和S2O2-3三种离子的最佳配比，建立了噻虫嗪化学氧化降解模型，并确定其最佳降解条件为：Fe2+浓度为0.69 mmol·L-1，S2O2-3为0.69 mmol·L-1，S2O2-8为3.29 mmol·L-1。最后在三种离子最佳配比条件下探究了不同溶液初始pH值、不同底物浓度及其活性氧物种淬灭剂对噻虫嗪的降解情况影响。研究结果表明，噻虫嗪在pH＝9.0时降解率较好，噻虫嗪的降解率随着底物浓度的增加而减小，活性氧物种淬灭剂会降低噻虫嗪的降解率。
위탐토새충진재Fe2+/S2O2-8/S2O2-3체계하강해정황，수선통과단인소실험연구료불동Fe2+、S2O2-8화S2O2-3농도대새충진강해솔적영향，연후통과중심복합실험，연구각단인소지간적상호영향，득출료Fe2+/S2O2-8/S2O2-3체계하Fe2+、S2O2-8화S2O2-3삼충리자적최가배비，건립료새충진화학양화강해모형，병학정기최가강해조건위：Fe2+농도위0.69 mmol·L-1，S2O2-3위0.69 mmol·L-1，S2O2-8위3.29 mmol·L-1。최후재삼충리자최가배비조건하탐구료불동용액초시pH치、불동저물농도급기활성양물충쉬멸제대새충진적강해정황영향。연구결과표명，새충진재pH＝9.0시강해솔교호，새충진적강해솔수착저물농도적증가이감소，활성양물충쉬멸제회강저새충진적강해솔。
Thiamethoxam, one of neonicotinoid insecticides, is characterized with low soil sorption and high water solubility, making it a po-tential contaminant of surface and underground water. Here we examined the chemical oxidation degradation of thiamethoxam in Fe2+/S2O2-8/S2O2-3 aqueous solution. The results showed that the degradation efficiency of thiamethoxam was 99.9%after 240 min reaction. The oxidizing ability of Fe2+/S2O2-8/S2O2-3 was significantly affected by the concentrations of Fe2+, S2O2-8 and S2O2-3 . Three ion interactions experiment by the central composite design(CCD)showed that the optimum ratios for Fe2+/S2O2-8/S2O2-3 system were 0.69 mmol·L-1 Fe2+, 0.69 mmol·L-1 S2O2-3 and 3.29 mmol·L-1 S2O2-8 . Higher degradation efficiency was observed at pH=9.0. Thiamethoxam degradation was reduced by higher concen-trations of substrate and presence of reactive oxidative species scavengers.