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首页> 外文期刊>Environmental Science & Technology >Quantitative 3D Shape Description of Dust Particles from Treated Seeds by Means of X-ray Micro-CT
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Quantitative 3D Shape Description of Dust Particles from Treated Seeds by Means of X-ray Micro-CT

机译：X射线微CT定量分析处理过的种子中尘埃颗粒的3D形状

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摘要

Crop seeds are often treated with pesticides before planting. Pesticide-laden dust particles can be abraded from the seed coating during planting and expelled into the environment, damaging nontarget organisms. Drift of these dust particles depends on their size, shape and density. In this work, we used X-ray micro-CT to examine the size, shape (sphericity) and porosity of dust particles from treated seeds of various crops. The dust properties quantified in this work were very variable in different crops. This variability may be a result of seed morphology, seed batch, treatment composition, treatment technology, seed cleaning or an interaction of these factors. The intraparticle porosity of seed treatment dust particles varied from 0.02 to 0.S1 according to the crop and generally increased with particle size. Calculated settling velocities demonstrated that accounting for particle shape and porosity is important in drift studies. For example, the settling velocity of dust particles with an equivalent diameter of 200 μm may vary between 0.1 and 1.2 m s~(-1), dependmg on their shape and density. Our analysis shows that in a wind velocity of 5 m s~(-1), such particles ejected at 1 m height may travel between 4 and 50 m from the source before settling. Although micro-CT is a valuable tool to characterize dust particles, the current image processing methodology limits the number of particles that can be analyzed.
机译：作物种子通常在播种前用农药处理。种植过程中，载有农药的灰尘颗粒可能会从种皮上被擦掉并排放到环境中，从而损害非目标生物。这些灰尘颗粒的漂移取决于它们的大小，形状和密度。在这项工作中，我们使用X射线微型CT检查了各种农作物处理过的种子中尘埃颗粒的大小，形状（球形）和孔隙率。在这项工作中量化的粉尘特性在不同的农作物中变化很大。这种变化可能是种子形态，种子批次，处理成分，处理技术，种子清洁或这些因素相互作用的结果。根据作物的不同，种子处理粉尘颗粒的颗粒内孔隙度在0.02至0.S1之间变化，并且通常随颗粒大小而增加。计算的沉降速度表明，考虑颗粒形状和孔隙度在漂移研究中很重要。例如，当量直径为200μm的尘埃颗粒的沉降速度可能在0.1到1.2 m s〜（-1）之间变化，这取决于它们的形状和密度。我们的分析表明，在5 m s〜（-1）的风速下，这种在1 m高处喷出的颗粒可能在沉降之前从源头传播4至50 m。尽管微型CT是表征灰尘颗粒的有价值的工具，但当前的图像处理方法限制了可以分析的颗粒数量。

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  • 来源
    《Environmental Science & Technology》 |2015年第12期|7310-7318|共9页
  • 作者

    Wouter Devarrewaere; Dieter Foque; Udo Heimbach; Dennis Cantre; Bart Nicolai; David Nuyttens; Pieter Verboven;

  • 作者单位

    BIOSYST-MeBioS, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium;

    Agricultural Engineering, Technology and Food Science Unit, Institute for Agricultural and Fisheries Research (ILVO), 9820 Merelbeke, Belgium;

    Institute for Plant Protection in Field Crops and Grassland, JKI, 38104 Braunschweig, Germany;

    BIOSYST-MeBioS, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium;

    BIOSYST-MeBioS, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium;

    Agricultural Engineering, Technology and Food Science Unit, Institute for Agricultural and Fisheries Research (ILVO), 9820 Merelbeke, Belgium;

    BIOSYST-MeBioS, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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