欢迎访问《中国农学通报》,

中国农学通报 ›› 2019, Vol. 35 ›› Issue (6): 44-53.doi: 10.11924/j.issn.1000-6850.casb18100009

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

三种不同类型土壤对Cr(Ⅵ)的吸附特性

刘晓娟1, 程 滨1, 赵瑞芬2, 滑小赞2, 王 森2, 王 钊2, 任哲斌1   

  1. 1.山西大学生物工程学院;2.山西省农业科学院农业环境与资源研究所
  • 收稿日期:2018-10-08 修回日期:2019-01-25 接受日期:2018-10-25 出版日期:2019-02-22 发布日期:2019-02-22
  • 通讯作者: 程 滨
  • 基金资助:
    山西省重点研发计划重点项目“主要农业生态区域农业面源污染关键技术研究与集成示范”(201603D21110-1-2);山西省青年科技研究基 金“太原市菜地土壤和蔬菜重金属现状调查及其健康风险评估”(201601D202071);山西省重点研发计划项目“污灌农田土壤重金属cd 迁移转化规律 及其机理研究”(201803D31209-1)。

Adsorption Characteristics of Cr(VI) in Three Soil Types

  • Received:2018-10-08 Revised:2019-01-25 Accepted:2018-10-25 Online:2019-02-22 Published:2019-02-22

摘要: 为了解Cr(Ⅵ)在土壤中的迁移转化规律,探明Cr(Ⅵ)在土壤中的吸附行为,采用室内振荡平衡法,以褐土、潮土以及黄绵土为研究对象,研究振荡时间、温度对土壤吸附Cr(Ⅵ)的影响。结果表明:(1)不同类型、不同层次土壤对Cr(Ⅵ)的吸附平衡时间和吸附量不同。3种供试土壤的振荡平衡时间顺序依次为黄绵土>潮土>褐土;在吸附平衡24 h时,3种供试土壤的吸附量顺序依次为潮土>褐土>黄绵土(2)随着温度的升高,吸附量逐渐下降,不同类型的土壤下降速度不一样。3种供试土壤对Cr(VI)的吸附量下降速度的顺序为潮土>黄绵土>褐土。3)3种供试土壤吸附Cr(Ⅵ)的等温线均符合 Freundlich方程和 Langmuir方程,但Freundlich方程的拟合效果更好。(4)3种供试土壤的吸附都是非自发的(ΔG>0),且放热(ΔH<0)的化学吸附过程。

关键词: 暴雪, 暴雪, 倒槽加回流, 低空急流, 切变线, 干线

Abstract: To understand the regulation of migration and conversion of Cr(VI) in soil, and investigate the adsorption of Cr(VI) in soil, the oscillation balance method was used to study the effect of oscillation time and temperature on Cr(VI) adsorption of cinnamon soil, fluvo-aquic soil and loess soil. The results showed that (1) the adsorption equilibrium time and adsorption capacity of Cr(VI) in different soil types and depths were different, the order of oscillation equilibrium time of the tested soil was loess soil > fluvo-aquic soil > cinnamon soil; for 24 h adsorption equilibrium, the adsorption of the tested soil was fluvo- aquic soil > cinnamon soil > loess soil; (2) as temperature increased, the amount of adsorption gradually decreased, and the rate of decline was different; the decreasing order of the adsorption rate of Cr(VI) was fluvo-aquic soil > loess soil > cinnamon soil; (3) the isotherms of Cr(VI) adsorbed by the three soil types were consistent with the Freundlich equation and the Langmuir equation, and the Freundlich equation was better; (4) the adsorption of the tested soil was non-spontaneous (ΔG>0) and exothermic (ΔH<0) chemisorption process.