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首页> 外文期刊>Journal of environmental science and health >Assessment of metolachlor and diuron leaching in a tropical soil using undisturbed soil columns under laboratory conditions
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Assessment of metolachlor and diuron leaching in a tropical soil using undisturbed soil columns under laboratory conditions

机译：在实验室条件下使用原状土壤柱评估热带土壤中甲草胺和敌草隆的浸出

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摘要

In the present study, diuron [3-(3,4-dichlorophenyl)-l,l-dimethylurea] and metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-metoxi-l-methylethyl)acetamide] leaching was studied in undisturbed soil columns collected in a cotton crop area in Mato Grosso State, Brazil. The pesticides were applied to the soil surface in dosages similar to those used in a cotton plantation. To assess the leaching process, soil columns were submitted to simulated rain under laboratory conditions at 25 ± 3℃, in the absence of wind and direct solar radiation. During the rain simulations, leachate solutions were collected and herbicide concentrations were determined. At the end of the experiment, the soil columns were cut into 10 cm sections to determine the remaining herbicide concentrations through the soil profile. Metolachlor was detected in all soil sections, and approximately 4％ of the applied mass was leached. Diuron was detected only in the upper two soil sections and was not detected in the leachate. A linear correlation (r ＞ 0.94) between the metolaehlor soil concentrations and the organic contents of the soil sections was observed. Mass balance suggests that around 56％ of diuron and 40％ of metolaehlor were degraded during the experiments. Measurements of the water table depth in the area where the samples were collected showed that it varied from 2 to 6 m and is therefore vulnerable to contamination by the studied herbicides, particularly metolaehlor, which demonstrated a higher leaching potential.
机译：在本研究中，双嘧磺隆[3-（3,4-二氯苯基）-1,1-二甲基脲]和异丙甲草胺[2-氯-N-（2-乙基-6-甲基苯基）-N-（2-甲氧基-1）在巴西马托格罗索州棉花种植区收集的未扰动土壤柱中研究了[-甲基乙基）乙酰胺]浸出。以类似于棉花种植园的剂量将农药施用到土壤表面。为了评估淋溶过程，在没有风和阳光直射的情况下，在25±3℃的实验室条件下，将土壤柱置于模拟雨中。在降雨模拟过程中，收集了沥滤液，并确定了除草剂的浓度。在实验结束时，将土壤柱切成10厘米的部分，以确定土壤剖面中剩余的除草剂浓度。在所有土壤切片中均检测到甲草胺，其中约4％的浸出物被浸出。敌草隆仅在上部两个土壤区域中被检测到，而渗滤液中未检测到。观测到甲基异烟尔土壤浓度与土壤剖面有机含量之间存在线性关系（r＞ 0.94）。质量平衡表明，在实验过程中约有56％的敌草隆和40％的甲乙ola降解。对收集样品区域的地下水位深度的测量表明，该深度范围为2至6 m，因此很容易受到所研究的除草剂（尤其是灭草灵）的污染，而除草剂具有较高的浸出潜力。

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  • 来源
    《Journal of environmental science and health》 |2013年第3期|114-121|共8页
  • 作者

    ELIANA F.G.C. DORES; LUANA DE SOUZA; RICARDO D. VILLA; ALICIO ALVES PINTO;

  • 作者单位

    Departamento de Quimica, ICET, Universidade Federal do Mato Grosso, Av. Fernando Correa n. 2367, Boa Esperan9a 78060900 - Cuiaba, Mato Grosso, Brazil;

    Department of Chemistry, Universidade Federal de Mato Grosso, Ciuaba, Mato Grosso, Brazil;

    Department of Chemistry, Universidade Federal de Mato Grosso, Ciuaba, Mato Grosso, Brazil;

    Department of Chemistry, Universidade Federal de Mato Grosso, Ciuaba, Mato Grosso, Brazil;

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  • 正文语种 eng
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  • 关键词

    Herbicides; contamination; leaching;

    机译：除草剂;污染;浸出;

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