| 阳 海,庞怀林,谭小军,胡志斌,张文强,彭嘉运,易 兵.Fe2+/S2O2-8/S2O2-3体系下噻虫嗪的降解研究[J].农业环境科学学报,2014,33(6):1124-1130. |
| Fe2+/S2O2-8/S2O2-3体系下噻虫嗪的降解研究 |
| Chemical Oxidation Degradation of Thiamethoxam in Fe2+/S2O2-8/ S2O2-3 Aqueous Solution |
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| DOI：10.11654/jaes.2014.06.011 |
| 中文关键词: 噻虫嗪 单因素实验 中心复合实验 化学氧化降解 |
| 英文关键词: thiamethoxam single factorial experiment central composite experiment chemical oxidation degradation |
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| 摘要点击次数: 3302 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Thiamethoxam, one of neonicotinoid insecticides, is characterized with low soil sorption and high water solubility, making it a potential 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 S2O2-3and 3.29 mmol·L-1 S2O2-8. Higher degradation efficiency was observed at pH=9.0. Thiamethoxam degradation was reduced by higher concentrations of substrate and presence of reactive oxidative species scavengers. |
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