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    江汉平原旱地和水田土壤镉的吸附与解吸特征及影响因素

    陈孜涵 汪丙国 赵建芳

    陈孜涵, 汪丙国, 赵建芳, 2022. 江汉平原旱地和水田土壤镉的吸附与解吸特征及影响因素. 地球科学, 47(2): 544-555. doi: 10.3799/dqkx.2021.108
    引用本文: 陈孜涵, 汪丙国, 赵建芳, 2022. 江汉平原旱地和水田土壤镉的吸附与解吸特征及影响因素. 地球科学, 47(2): 544-555. doi: 10.3799/dqkx.2021.108
    Chen Zihan, Wang Bingguo, Zhao Jianfang, 2022. Adsorption and Desorption Characteristics of Cd in Upland and Paddy Soil of Jianghan Plain. Earth Science, 47(2): 544-555. doi: 10.3799/dqkx.2021.108
    Citation: Chen Zihan, Wang Bingguo, Zhao Jianfang, 2022. Adsorption and Desorption Characteristics of Cd in Upland and Paddy Soil of Jianghan Plain. Earth Science, 47(2): 544-555. doi: 10.3799/dqkx.2021.108

    江汉平原旱地和水田土壤镉的吸附与解吸特征及影响因素

    doi: 10.3799/dqkx.2021.108
    基金项目: 

    国家自然科学基金项目 41772268

    中国地质调查局项目 DD20190263

    中国地质调查局项目 2019040022

    详细信息
      作者简介:

      陈孜涵(1997-), 女, 硕士研究生, 主要从事重金属分布及迁移规律研究.ORCID: 0000-0003-1633-1894.E-mail: 2536823580@qq.com

      通讯作者:

      汪丙国, ORCID: 0000-0002-3682-6846.E-mail: bgwang@cug.edu.cn

    • 中图分类号: X141

    Adsorption and Desorption Characteristics of Cd in Upland and Paddy Soil of Jianghan Plain

    • 摘要: 为揭示旱地和水田土壤镉的吸附解吸特征,以江汉平原黄豆地、棉花地以及水稻田土壤为研究对象,开展土壤镉的吸附动力学实验、等温吸附-解吸实验以及有机质的影响实验.结果表明:江汉平原土壤对镉的吸附是一个较为复杂的吸附动力学过程且以化学吸附为主,研究区土壤镉的初始吸附速率总体上表现为水田土壤大于旱地土壤;旱地土壤对Cd2+具有较低的吸附能力和较高的解吸能力,水田土壤对Cd2+具有较高的吸附能力和较低的解吸能力,这与土壤有机质含量、土壤粘粒含量等因素有关;去除有机质后旱地、水田土壤对镉的吸附量均明显下降,且旱地土壤降幅更为明显,水田土壤去除有机质后对Cd2+的吸附能力依然高于旱地土壤.研究结果可为不同类型农田土壤的镉污染修复提供理论依据.

       

    • 图  1  研究区采样点位置

      Fig.  1.  The location of sampling points in the study area

      图  2  Cd2+的吸附量随时间的变化曲线

      Fig.  2.  The curve of adsorption capacity of Cd2+ with time

      图  3  土壤对Cd2+的吸附等温线

      Fig.  3.  The adsorption isotherm of soil for Cd2+

      图  4  固液分配系数和初始浓度关系

      a. 黄豆地和棉花地;b. 水稻田1和水稻田2

      Fig.  4.  The relationship between solid-liquid partition coefficient and initial concentration

      图  5  土壤对Cd2+的解吸量与吸附量关系图(a, b); 解吸率与初始浓度的关系图(c, d)

      a.黄豆地和棉花地;b.水稻田1和水稻田2;c. 黄豆地和棉花地;d. 水稻田1和水稻田2

      Fig.  5.  The relationship between desorption and adsorption of Cd2+ in soil(a, b); The relationship between soil Cd2+ desorption rate and initial concentration(c, d)

      图  6  不同土壤X射线衍射图谱

      Fig.  6.  X-ray diffraction patterns of different soils

      图  7  土壤有机质对土壤吸附Cd的影响对比图(a, b); 去除有机质土壤的固液分配系数变化图(c, d)

      a. 黄豆地和棉花地;b. 水稻田1和水稻田2;c. 黄豆地和棉花地;d. 水稻田1和水稻田2

      Fig.  7.  The comparison of effects of soil organic matter on Cd adsorption by soil(a, b); The variation of solid-liquid partition coefficient of soil with organic matter removed(c, d)

      表  1  供试样品基本情况

      Table  1.   The basic information of test samples

      样品名称 地理位置 土地利用 室内命名 pH TOC(%) 粘粒(%) Cd(mg·kg-1)
      黄豆地 三伏潭镇李泰村 黄豆地 粉砂壤土 8.27 0.48 0.94 0.24
      棉花地 沙湖镇沙湖原种场 棉花地 粉砂壤土 8.06 0.71 0.76 0.27
      水稻田1 郑场镇香卜村 水稻田 粉砂壤土 8.70 0.99 1.90 0.37
      水稻田2 胡场镇蔡滩村 水稻田 粉砂壤土 7.93 1.05 1.09 0.41
      下载: 导出CSV

      表  2  吸附动力学模型拟合参数

      Table  2.   The fitting parameters of adsorption kinetic model

      模型 参数 黄豆地 棉花地 水稻田1 水稻田2
      Elovich模型 β 0.046 4 0.047 6 0.051 2 0.048 0
      α 4.26E+08 2.57E+08 4.75E+08 5.72E+08
      R2 0.952 7 0.877 9 0.914 1 0.982 1
      下载: 导出CSV

      表  3  等温吸附模型拟合参数

      Table  3.   Fitting parameters of isothermal adsorption model

      模型 参数 黄豆地 棉花地 水稻田1 水稻田2
      Langmuir等温线 K1 -12.61 -14.68 -35.61 -26.94
      Langmuir等温线
      $ {q}_{\mathrm{e}}=\left({S}_{\mathrm{m}}+{K}_{\mathrm{l}}{C}_{\mathrm{e}}\right)/\left(1+{K}_{\mathrm{l}}{C}_{\mathrm{e}}\right) $
      Sm 588.5 538.8 727.1 703.3
      R2 0.201 40 0.264 40 0.077 82 0.098 82
      Freundlich等温线
      $ q_{\mathrm{e}}=K_{\mathrm{f}} C_{\mathrm{e}}^{1 / n} $
      Kf 186.0 242.1 375.1 385.8
      1/n 0.448 6 0.332 4 0.377 1 0.345 5
      R2 0.980 6 0.921 6 0.984 1 0.967 4
      下载: 导出CSV

      表  4  土壤矿质元素含量(%)

      Table  4.   Content of mineral elements in soil

      Na2O MgO Al2O3 K2O CaO TFe2O3 SiO2
      黄豆地 1.34 2.18 15.16 2.83 2.33 6.16 61.63
      棉花地 1.68 1.87 13.88 2.44 1.82 5.35 64.91
      水稻田1 1.23 2.39 15.73 3.01 2.09 6.65 62.02
      水稻田2 0.98 2.46 15.79 3.07 2.33 7.06 61.39
      下载: 导出CSV
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