Desorption Characteristics of Aluminum in Planosol

WANG Yu1; DUAN Junya 1; 2; WANG Yujun1; GONG Wanwei1; ZHANG Minghang1

doi:10.13870/j.cnki.stbcxb.2018.02.050

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Desorption Characteristics of Aluminum in Planosol

更新时间：2025-03-12

- Desorption Characteristics of Aluminum in Planosol
- Vol. 32, Issue 2, Pages: 343-348(2018)
- 作者机构：
  
  1. 吉林农业大学资源与环境学院,长春,130118
  2. 张家口智昊环保科技有限公司,河北,张家口,075000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2018.02.050
  CLC： X502
- Published：2018
- 稿件说明：
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WANG Yu1, DUAN Junya 1, 2, et al. Desorption Characteristics of Aluminum in Planosol[J]. 2018, 32(2): 343-348.
DOI：

WANG Yu1, DUAN Junya 1, 2, et al. Desorption Characteristics of Aluminum in Planosol[J]. 2018, 32(2): 343-348. DOI： 10.13870/j.cnki.stbcxb.2018.02.050.

摘要

为探讨发生铝污染的白浆土中金属铝的解吸特性，采用平衡振荡法，研究铝在白浆土中的解吸行为及不同因素的影响。结果表明：在720 min后，白浆土中的铝解吸基本达到平衡；25 ℃下，土壤有机质含量为42.2 g/kg，铝在白浆土中的解吸量仅为吸附量的1.5%；用Langmuir方程可很好地拟合白浆土中铝解吸等温曲线（r=0.985 9**），说明表面均匀单层解吸占主导；热力学参数ΔG＜0，ΔH＞0，ΔS＞0，表明铝的解吸是自发、吸热和熵增加的过程。土壤有机质由42.2 g/kg降至27.8 g/kg时，白浆土中铝的最大解吸量由25.87 mg/kg升至66.11 mg/kg，且导致解吸滞后现象的加剧。pH降至3时，铝的解吸量升至226.4 mg/kg，是pH在5～7时的8倍以上。随着解吸液中NaCl和Na2SO4浓度的增加，铝的解吸量增加。总之，吸附到白浆土中的铝解吸能力较弱，但pH和有机质含量降低，无机盐含量升高，铝的解吸量大幅增加，污染风险急剧上升。

Abstract

To analyze the desorption characteristics of aluminum in planosol soil with aluminum pollution

balanced oscillating method was applied to study the aluminum desorption behavior and the influence of different factors in planosol soil. The results showed that the aluminum desorption in planosol soil reached equilibrium after 720 min. At 25 ℃

the content of soil organic matter was 42.2 g/kg

and the desorption capacity of aluminum in planosol soil was only about 1.5% of the adsorption capacity. The Langmuir equation fit well on the desorption isotherm of aluminum in planosol soil (r=0.985 9**) and showed that the surface uniform monolayer dominated desorption. The thermodynamic parameters ΔG＜0

ΔH＞0

ΔS＞0 indicated that the aluminum desorption was a spontaneous

endothermic

and entropy increase process. The content of soil organic material decreased from 42.2 g/kg to 27.8 g/kg

the maximum desorption of aluminum in planosol soil increased from 25.87 mg/kg to 66.11 mg/kg

and the phenomenon of desorption hysteresis was enhanced. When the pH dropped to 3

the aluminum desorption capacity rapidly rose to 226.4 mg/kg

which was 8 times more than that at pH 5～7. With the increased concentration of NaCl and Na2SO4 in the desorption solution

the desorption capacity of aluminum also increased. In a word

the desorption capacity of aluminum that absorbed into planosol soil was relatively weak

but the desorption capacity of aluminum greatly increased

and the risk of pollution sharply increased with the decreased pH and the content of organic matter

and the increased content of inorganic salt.

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LI Song-lin1,LU Jun1,ZHANG Feng1,SUN Si-yang2,DENG Ou-ping3(1.College of Environmental Science and Natural Resources,Zhejiang University,Hangzhou 310029,2.Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition,3.China Ministry of Education Key Lab of Environmental Remediation and Ecological Health,)

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