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首页> 外文期刊>Journal of soils & sediments >Transport velocities of aniline and nitrobenzene in sandy sediment
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Transport velocities of aniline and nitrobenzene in sandy sediment

机译：含有苯胺和硝基苯的运输速度

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摘要

Purpose: The research aimed to determine the transport velocities of aniline (AN) and nitrobenzene (NB) in sandy sediment so as to predict the pollution plume in sandy aquifer. The transport velocities of organic compounds in aquifer depend on various factors. This research also evaluated the effects of compound type, single or mixture solute systems, pore-water velocity (v), and pH on the transport velocities of AN and NB. These results will facilitate more precise determination of transport velocities.Materials and methods: Column experiments containing sorption and desorption periods were conducted using typical sandy sediment from JiangHan Plain, China. Special emphasis was placed on the variation of compounds, solute systems, v from 4.5 to 10 cm h(-1), and pH from 5 to 8.5. The transport curves of AN and NB were simulated using different sorption models coupled in HYDRUS-1D and the partition coefficient, K-d, was determined by inverse solution. The retardation coefficient (R) and transport velocity (1/R) were calculated based on K-d and the basic properties of the column. The transport velocities of AN and NB in various experimental conditions were compared and discussed.Results and discussion: The linear non-equilibrium two-site (L2Site) sorption model coupled in HYDRUS-1D best described the sorption of AN and NB during the transport process in the sandy sediment. The 1/R values of AN and NB were 0.47-0.67 m and 0.16-0.21 m, respectively. AN transported three times faster than NB in both single and mixture systems. Lower v enhanced the transport of AN but displayed limited impact on the transport of NB in single solute system. In mixture solute system, the 1/R values of AN tended to decrease and NB increase at lower v, which suggested an interference between AN and NB transports. Both transport velocities of AN and NB potentially increase with pH.Conclusions: AN and NB can transport 0.47-0.67 m and 0.16-0.21 m, respectively, when groundwater flows 1 m at various experimental conditions. The transport velocities of AN and NB depend on the type of compounds, single or mixture solute system, v, and pH. All the factors should be considered when we determine the parameter, transport velocities, for prediction of pollution plume.
机译：目的：研究旨在确定含沙沉积物中苯胺（AN）和硝基苯（NB）的运输速度，以预测含沙含水层的污染羽流。含水层中有机化合物的运输速度取决于各种因素。该研究还评估了复合型，单或混合物溶质系统，孔隙水速度（V）和pH对AN和NB的运输速度的影响。这些结果将促进更精确的运输速度测定。使用中国江汉平原典型的砂土进行吸附和解吸时期的柱实验。将特殊的重点放在化合物，溶质体系，v的变化，从4.5至10cm H（-1），pH从5-8.5中。使用在氢气-1D中偶联的不同吸附模型和分配系数K-D模拟AN和NB的传输曲线通过反溶液测定。基于K-D计算延迟系数（R）和传输速度（1 / R）和柱的基本性质。比较和讨论各种实验条件中A和NB的传输速度和讨论。结果和讨论：在Hydrus-1d中耦合的线性非平衡两位点（L2Site）吸附模型最佳地描述了运输过程中AN和NB的吸附在沙质沉积物中。 A和Nb的1 / R值分别为0.47-0.67m和0.16-0.21m。在单一和混合系统中，在Nb上运输三倍。较低的V增强了对单溶质系统中Nb的运输的输送而显示的有限影响。在混合物溶质系统中，倾向于降低和Nb在较低V的下降的1 / R值，这提出了An和Nb传输之间的干扰。 AN和NB的传输速度均潜在地增加pH.CONCLUSIONS：AN和NB分别在地下水在各种实验条件下流动1M时，分别可以分别运输0.47-0.67m和0.16-0.21m。 A和Nb的运输速度取决于化合物，单或混合物溶质系统，V和pH的类型。当我们确定参数，运输速度时，应考虑所有因素，以便预测污染羽流。

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  • 来源
    《Journal of soils & sediments》 |2019年第5期|2570-2579|共10页
  • 作者

    Zakari Sissou; Liu Hui; Zhou Huazhong;

  • 作者单位

    China Univ Geosci State Key Lab Biogeol & Environm Geol Wuhan 430074 Hubei Peoples R China|China Univ Geosci Sch Environm Studies Wuhan 430074 Hubei Peoples R China|Chinese Acad Sci CAS Key Lab Trop Forest Ecol Xishuangbanna Trop Bot Garden Menglun 666303 Yunnan Peoples R China;

    China Univ Geosci State Key Lab Biogeol & Environm Geol Wuhan 430074 Hubei Peoples R China|China Univ Geosci Sch Environm Studies Wuhan 430074 Hubei Peoples R China;

    Hubei Plants Protect Stn Wuhan 430071 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aniline; HYDRUS-1D; Nitrobenzene; Sandy sediment; Transport;

    机译：苯胺;肼-1D;硝基苯;砂质沉积物;运输;

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