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首页> 外文期刊>Journal of environmental science and health >Evaluation of sorption-desorption processes for metalaxyl in natural and artificial soils
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Evaluation of sorption-desorption processes for metalaxyl in natural and artificial soils

机译：评价天然和人造土壤中甲霜灵的吸附-解吸过程

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The main process controlling soil-pesticide interaction is the sorption-desorption as influenced by active soil surfaces. The sorption phenomena can influence translocation, volatility, persistence and bioactivity of a pesticide in soil. The present investigation was conducted on natural and artificial soils in order to enumerate the effect of soil components such as montmorillonite and ferrihydrite on the sorption behaviour of the fungicide metalaxyl and if sorption-desorption of the chiral pesticide affects the enantiomeric ratio. The sorption-desorption characteristics of metalaxyl were investigated by batch equilibration technique in a natural soil, two artificial soils, and in pure montmorillonite and ferrihydrite. After extraction, pesticide residues were analyzed by conventional and chiral chromatography using tandem mass spectrometry. A K_(dSorp) (2.3-6.5) suggests low level sorption of metalaxyl with an appreciable risk of run-off and leaching. Thus, metalaxyl poses a threat to surface and ground water contamination. Furthermore, desorption tests revealed a hysteretic effect (H ≤ 0.8) in natural and artificial soils. Significant amount of metalaxyl was found tightly bound to the adsorbents without desorbing readily after desorption cycle. Desorption of 22-56% of the total amount of the retained metalaxyl was determined. This study reveals that an artificial soil derived from different soil constituents can be used to assess their influence on sorption/desorption processes. The present investigation showed that both montmorillonite and ferrihydrite play a significant role in the sorption of metalaxyl. The sorption doesn't influence the enantiomeric ratio of racemic metalaxyl.
机译：控制土壤-农药相互作用的主要过程是受活性土壤表面影响的吸附-解吸。吸附现象会影响农药在土壤中的易位，挥发性，持久性和生物活性。本研究是在天然和人工土壤上进行的，目的是枚举蒙脱土和水铁矿等土壤成分对杀菌剂甲霜灵的吸附行为的影响，以及手性农药的吸附-解吸是否影响对映体比率。通过间歇平衡技术研究了甲霜灵在天然土壤，两种人工土壤以及纯蒙脱土和水铁矿中的吸附-解吸特性。提取后，通过传统质谱和手性色谱法使用串联质谱法分析农药残留。 K_（dSorp）（2.3-6.5）表明甲霜灵的低水平吸附，具有径流和浸出的明显风险。因此，甲霜灵对地表水和地下水污染构成威胁。此外，解吸测试显示在天然和人造土壤中有滞后作用（H≤0.8）。发现大量的甲霜灵与吸附剂紧密结合，在解吸循环后不易解吸。测定了保留的甲霜灵总量的22-56％的解吸。这项研究表明，来自不同土壤成分的人工土壤可用于评估其对吸附/解吸过程的影响。本研究表明，蒙脱石和水铁矿在甲霜灵的吸附中均起着重要作用。吸附不会影响外消旋甲霜灵的对映体比率。

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