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Factors affecting metribuzin retention in Algerian soils and assessment of the risks of contamination

机译：阿尔及利亚土壤中甲曲嗪的保留影响因素及污染风险评估

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摘要

Metribuzin is a widely used herbicide around the world but it could lead to soil and water contamination. Metribuzin retention on a silty-clay agricultural soil of Algeria was studied in laboratory batch experiments to assess the contamination risk of the groundwater. Factors conditioning the fate of metribuzin were investigated: soil nature, metribuzin formulation, NPK fertilizer, and soil pH. Freundlich sorption isotherms gave the coefficients KF between 1.2 and 4.9 and a between 0.52 and 0.93. The adsorption is directly dependent on organic and clay soil contents. Formulated metribuzin (Metriphar) reduces the adsorption (KF= 1.25) compared to pure metribuzin (KF=2.81). The addition of an NPK fertilizer decreases the soil pH (6.67 for the soil without fertilizer and 5.86 for 2 % of fertilizer) and increases metribuzin adsorption (KF is 4.83 for 2 % of fertilizer). The pH effect on the adsorption is corroborated in experiments changing the soil pH between 5 (KF is 4.17) and 8 (KF is 1.57) under controlled conditions. Desorption isotherms show a hysteresis and only 30 to 40 % of the initially adsorbed metribuzin is released. The estimated GUS index is ≥2.8 for a DT50≥30 days. KF values and the hysteresis show that metribuzin is little but strongly retained on the soil. Formulated metribuzin and addition of fertilizer affect the retention. However, the GUS index indicates a high mobility and a significant risk of leaching. The most appropriate risk management measure would be an important increase in organic matter content of the soil by addition of organic amendments.
机译：Metribuzin是全世界广泛使用的除草剂，但它可能导致土壤和水污染。在实验室分批实验中研究了阿尔及利亚粉质粘土农业土壤上的Metribuzin保留量，以评估地下水的污染风险。研究了影响甲氧信嗪命运的因素：土壤性质，甲氧信嗪配方，NPK肥料和土壤pH值。 Freundlich吸附等温线给出的系数KF在1.2和4.9之间，/ na在0.52和0.93之间。吸附直接取决于有机物和粘土的含量。与纯甲氧丁嗪（KF = 2.81）相比，配制的甲氧丁嗪（Metriphar）可降低吸附（KF = 1.25）。氮磷钾肥料的添加会降低土壤的pH值（不含肥料的土壤为6.67，占肥料2％的土壤为5.86），并增加了metribuzin的吸附（肥料2％的KF为4.83）。在控制条件下将土壤pH值在5（KF为4.17）和8（KF为1.57）之间变化的实验中，证实了pH对吸附的影响。解吸等温线显示出滞后现象，只有30％到40％的最初吸附的三甲双胍被释放。 DT50≥30天的估计GUS指数≥2.8。 KF值和磁滞表明，metribuzin很少但牢固地保留在土壤中。配制的甲丁嗪和肥料的添加会影响保留。但是，GUS指数显示出较高的流动性和明显的浸出风险。最适当的风险管理措施是通过添加有机改良剂来显着增加土壤有机质含量。

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  • 来源
    《Environmental Monitoring and Assessment》 |2013年第5期|4107-4115|共9页
  • 作者

    Ouzna Oukali-Haouchine; Enrique Barriuso; Yamina Mayata; Khadija M. Moussaoui;

  • 作者单位

    Ecolc Nationale Polytechnique,Laboratory of Environmental Sciences and Technology,10 Avenue Hassen Badi, BP 182, 16200 Algiers, Algeria;

    INRA-AgroParisTech, Unite Mixte de Recherche,Environnement et Grandes Cultures,78850 Thiverval-Grignon, France;

    Ecolc Nationale Polytechnique,Laboratory of Environmental Sciences and Technology,10 Avenue Hassen Badi, BP 182, 16200 Algiers, Algeria;

    Ecolc Nationale Polytechnique,Laboratory of Environmental Sciences and Technology,10 Avenue Hassen Badi, BP 182, 16200 Algiers, Algeria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    metribuzin; soil retention; formulation; ph; fertilizer; risk assessment;

    机译：美法津土壤保持力;公式;ph肥料;风险评估;

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