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首页> 外文期刊>Bulletin of the National Research Centre >Mineralization of ~(14)C-Carbofuran in Soil under Aerobic and Anaerobic Conditions
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Mineralization of ~(14)C-Carbofuran in Soil under Aerobic and Anaerobic Conditions

机译：好氧和厌氧条件下土壤中〜（14）C-呋喃呋喃的矿化作用

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摘要

The mineralization of ~(14)C-carbofuran in clay loam soil was determined during a three months laboratory incubation period under anaerobic and aerobic conditions. ~(14)C-activity in solution was directly determined by liquid scintillation counting. Unextractable soil residues were determined by combustion. Evolution of ~(14)CO_2 increased with time and reached to 7.5% and 12.0% of the initial ~(14)C-concentration, within 90 days in case of anaerobic and aerobic conditions, respectively. At that time, soil contained about 58% of the applied dose as extractable residues under anaerobic conditions and 59% under aerobic conditions. The unextractable pesticide residues were gradually increased with time and the highest binding capacity of about 5.3% and 13% in case of anaerobic and aerobic conditions, respectively were observed after 90 days of incubation. Chromatographic analysis of methanolic extracts revealed the presence of labelled carbofuran, carbofuran phenol and 3-hydroxycarbofuran as main products. Radiorespirometry was used to evaluate the effect of carbofuran on soil microbial activity for 14 days. Both 3 and 9 mg carbofuran/kg soil depressed ~(14)CO_2 evolution from ~(14)C-glucose and microbial activity was significantly inhibited especially in case of the high dose.
机译：在厌氧和有氧条件下，经过三个月的实验室培养期，确定了粘土壤土中〜（14）C-碳呋喃的矿化程度。通过液体闪烁计数直接确定溶液中的〜（14）C活性。通过燃烧确定不可提取的土壤残留物。在有氧和有氧条件下，在90天内，〜（14）CO_2的释放随时间增加，分别达到初始〜（14）C浓度的7.5％和12.0％。当时，土壤在厌氧条件下含有约58％的可提取残留物，在有氧条件下为59％。孵育90天后，随着时间的推移，不可提取的农药残留量逐渐增加，在厌氧和有氧条件下，最高结合能力分别约为5.3％和13％。甲醇提取物的色谱分析表明，存在标记的呋喃丹，呋喃丹酚和3-羟基呋喃呋喃为主要产物。放射呼吸法用于评估呋喃丹对土壤微生物活性的影响，持续14天。 3和9 m​​g的呋喃丹/ kg土壤抑制了〜（14）CO_2从〜（14）C-葡萄糖的释放，尤其是在高剂量的情况下，微生物活性被显着抑制。

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