| 杨宗政,李文轩,董春婷,赵润谦,王春虎,仇荣亮.螯合剂与低分子有机酸复配淋洗修复Cr（Ⅵ）污染土壤[J].农业环境科学学报,2024,43(3):543-552. |
| 螯合剂与低分子有机酸复配淋洗修复Cr（Ⅵ）污染土壤 |
| Washing remediation of polluted Cr(Ⅵ)-containing soil using chelators compounded with low-molecular weight organic acids |
| 投稿时间：2023-03-22 |
| DOI：10.11654/jaes.2023-0219 |
| 中文关键词: 土壤淋洗 Cr（Ⅵ） 复配淋洗剂 淋洗动力学 BCR提取法 |
| 英文关键词: soil washing chromium(Ⅵ) mixed reagent washing kinetic BCR |
| 基金项目:天津市科技支撑计划项目（20YDTPJC01820）；广东省环境污染控制与修复技术重点实验室开放研究基金项目（2020B1212060022） |
| 作者 | 单位 | E-mail | | 杨宗政 | 天津科技大学海洋与环境学院, 天津 300457
天津科技大学化工与材料学院, 天津 300457
天津市卤水化工与资源生态化利用重点实验室, 天津 300457 | | | 李文轩 | 天津科技大学海洋与环境学院, 天津 300457 | | | 董春婷 | 天津科技大学海洋与环境学院, 天津 300457 | | | 赵润谦 | 天津科技大学海洋与环境学院, 天津 300457 | | | 王春虎 | 天津科技大学化工与材料学院, 天津 300457
天津市卤水化工与资源生态化利用重点实验室, 天津 300457 | | | 仇荣亮 | 广东省环境污染控制与修复技术重点实验室(中山大学), 广州 510275
华南农业大学资源环境学院, 广东省农业农村污染治理与环境安全重点实验室, 广州 510642 | eesqrl@mail.sysu.edu.cn |
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| 中文摘要: |
| 为探究可生物降解螯合剂氨三乙酸（NTA）替代乙二胺四乙酸二钠（EDTA）在复配淋洗剂中的作用，本文研究了NTA和EDTA与草酸和酒石酸所配制的复配淋洗剂在不同浓度、固液比、pH值和淋洗时间下对Cr（Ⅵ）污染土壤淋洗效果的影响及淋洗动力学，此外还使用顺序提取方案（BCR）分析了淋洗前后土壤中重金属的形态、迁移率和稳定性变化。结果表明：混合等体积的0.25 mol·L-1 NTA和0.3 mol·L-1草酸在固液比为1∶9、pH为3、淋洗时长为240 min条件下达到最大Cr（Ⅵ）去除效率82.94%，这与使用EDTA淋洗时的效率相近；该复配淋洗剂淋洗Cr（Ⅵ）污染土壤时的动力学符合拟二级动力学方程；BCR实验结果表明，NTA和草酸复配淋洗后土壤中Cr的弱酸可提取态、可氧化态和残渣态组分含量分别从6 346.67、4 280.00、2 387.67 mg·kg-1下降至1 161.67、433.35、741.00 mg·kg-1，可还原态组分从2 746.67 mg·kg-1上升至6 016.67 mg·kg-1，污染土壤重金属迁移率下降。淋洗后土壤有机质含量从13.47%上升至30.56%，脲酶和脱氢酶活性分别从46.32、329.09 μg·d-1·g-1降低至29.36、131.98 μg·d-1·g-1，土壤结构基本与原土一致。因此，NTA与草酸复配淋洗剂是一种高效且对土壤影响较小的淋洗剂。 |
| 英文摘要: |
| To explore the role of the biodegradable chelating agent nitrilotriacetic acid(NTA) for the substitution of ethylenediaminetetraacetic acid disodium(EDTA) in mixed reagents, this study evaluated the washing kinetics of these mixed reagents, alongside the effects of concentration, solid-liquid ratios, pH values, and washing times, on their corresponding removal efficiencies of Cr(Ⅵ)-polluted soil, specifically by treating soil with NTA and EDTA compounded with oxalic acid and tartaric acid, respectively. In addition, the BCR sequential extraction procedure was used to analyze the differences in chemical states, mobility, and stability of heavy metals within the soil before and after washing. The corresponding results demonstrated that a maximum Cr(Ⅵ) removal efficiency of 82.94% could be achieved by using a mixed solution of 0.25 mol·L-1 NTA and 0.3 mol·L-1 oxalic acid in equal volume with a solid-liquid ratio of 1:9, pH of 3, and washing time of 240 min, which was consistent with that of EDTA. The Pseudo-second-order kinetic equation could be applied in the washing kinetic process. Meanwhile, the BCR results demonstrated that the Cr contents of the mild acid-soluble, oxidizable, and residual fractions in the soil were reduced from 6 346.67, 4 280.00 mg·kg-1, and 2 387.67 mg·kg-1 to 1 161.67, 433.35 mg·kg-1, and 741.00 mg·kg-1, respectively, after washing; in contrast, the reducible fraction increased from 2 746.67 mg·kg-1 to 6 016.67 mg·kg-1following washing, thereby indicating that heavy metal mobility was inhibited in the contaminated soil. Additionally, the organic matter content in the soil rose significantly after washing(from 13.47% to 30.56%), as the content of urease and dehydrogenase declined from 46.32 μg·d-1·g-1 and 329.09 μg·d-1·g-1 to 29.36 μg·d-1·g-1 and 131.98 μg·d-1·g-1, respectively; nonetheless, soil composition predominantly remained the same. Therefore, this compound of NTA and oxalic acid is an efficient eluant which has little effect on the soil. |
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