Effects of Chelating Agents and Thier Combinations on Remediation of Two Cadmium Contaminated Soils by Sedum plumbizincicola

doi:10.16258/j.cnki.1674-5906.2022.12.016

Ecology and Environment ›› 2022, Vol. 31 ›› Issue (12): 2414-2421.DOI: 10.16258/j.cnki.1674-5906.2022.12.016

Effects of Chelating Agents and Thier Combinations on Remediation of Two Cadmium Contaminated Soils by Sedum plumbizincicola

WU De¹^,²^,³(), PENG Ou¹^,²^,³, LIU Yuling¹^,²^,³, ZHANG Puxin¹^,²^,³, YIN Xuefei¹^,²^,³, HUANG Xinming¹^,²^,³, TIE Boqing¹^,²^,³^,^*()

1. College of Resources and Environment of Hunan Agricultural University, Changsha 410128, P. R. China
2. Hunan Engineering & Technology Research Center for Irrigation Water Purification 410128, P. R. China
3. Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture, Changsha 410128, P. R. China

Received:2022-04-06 Online:2022-12-18 Published:2023-02-15
Contact: TIE Boqing

螯合剂及组配对伴矿景天修复两种镉污染土壤的影响

伍德¹^,²^,³(), 彭鸥¹^,²^,³, 刘玉玲¹^,²^,³, 张朴心¹^,²^,³, 尹雪斐¹^,²^,³, 黄薪铭¹^,²^,³, 铁柏清¹^,²^,³^,^*()

1.湖南农业大学资源环境学院，湖南长沙 410128
2.湖南省灌溉水源水质污染净化工程技术研究中心，湖南长沙 410128
3.农业农村部南方产地污染防控重点实验室，湖南长沙 410128

通讯作者: 铁柏清
作者简介:伍德（1999年生），男，硕士研究生，主要研究方向为重金属污染治理与修复。E-mail: 3273718771@qq.com
基金资助:
国家自然科学基金项目(41907015);国家重点研发计划项目(2017YFD0801505)

Abstract

Abstract:

The effects of three chelating agents (EDTA, OA, and TA) and their combinations on remediation of Cd and Cd/As contaminated soil by Sedum plumbizincicola were investigated. The pH, total Cd concentration, available Cd concentration and Cd form before and after remediation were compared to evaluate the remediation performance of the chelating agents-Sedum plumbizincicola combined treatment on two Cd contaminated soils. The results showed that the pH of the two Cd contaminated soils decreased significantly after the application of chelating agents. Among the different treatments, EDTA-OA treatment resulted in the highest pH decreases (from 1.04 to 0.99), compared to that of control group. In terms of soil Cd forms, the contents of soluble Cd in the two Cd contaminated soils were significantly increased, and the maximum increase in soluble Cd content was observed in EDTA-OA treatment, (by 22.99% and 24.34%, respectively). In terms of Cd accumulation, the application of chelating agents promoted the Cd uptake by Sedum plumbizincicola with 25.80%-86.47% increases of Cd contents in plants. The chelating agents-Sedum plumbizincicola combined treatment achieved 16.62%-2.82% and 16.06%-24.98% remediation efficiencies for the two Cd contaminated soils, respectively. Among them, EDTA-OA treatment (1?1) was the most effective in enhancing performance Sedum plumbizincicola for remediation of the two Cd contaminated soils, and the remediation efficiency was increased by 9.06% and 12.14%, respectively.

Key words: chelating agent, Sedum plumbizincicola, phytoremediation, acid soil, cadmium contamination, combined pollution

摘要：

为探究螯合剂及其组配对伴矿景天（Sedum plumbizincicola）修复酸性Cd污染土壤的效果，以乙二胺四乙酸二钠（EDTA）、草酸（OA）、酒石酸（TA）3种螯合剂为试验材料，以Cd单一污染和Cd/As复合污染酸性农田土壤为研究对象，设置3种螯合剂单一处理及其组配处理，对比了修复前后两种污染土壤的pH值、全量Cd、有效态Cd含量、Cd形态的变化以及修复效率。研究结果表明：施用螯合剂后两种污染类型的土壤pH明显下降，其中以EDTA-OA组配处理pH下降最大，相比于对照组分别下降了1.04和0.99个单位。对于土壤镉形态而言，两种酸性土壤中弱酸可溶态Cd的含量显著提高，EDTA-OA处理效果最明显，两种土壤中可溶态Cd的含量分别提高了22.99%和24.34%。对于伴矿景天镉积累而言，施用螯合剂促进了伴矿景天对Cd的吸收，两种类型土壤施用螯合剂后植株镉含量增加了25.80%—86.47%。对于修复效率而言，施用螯合剂后伴矿景天在两种土壤中修复效率分别为16.62%—22.82%、16.06%—24.98%；以EDTA-OA处理效果最显著，修复效率分别提高了9.06%和12.14%。综合而言，在两种类型镉污染土壤中采用乙二胺四乙酸二钠和草酸1?1组配施用修复效果最好。

关键词: 螯合剂, 伴矿景天, 植物修复, 酸性土壤, Cd污染, 复合污染

CLC Number:

WU De, PENG Ou, LIU Yuling, ZHANG Puxin, YIN Xuefei, HUANG Xinming, TIE Boqing. Effects of Chelating Agents and Thier Combinations on Remediation of Two Cadmium Contaminated Soils by Sedum plumbizincicola[J]. Ecology and Environment, 2022, 31(12): 2414-2421.

伍德, 彭鸥, 刘玉玲, 张朴心, 尹雪斐, 黄薪铭, 铁柏清. 螯合剂及组配对伴矿景天修复两种镉污染土壤的影响[J]. 生态环境学报, 2022, 31(12): 2414-2421.

Figures/Tables 11

References 36

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试验地点 Experimental location	镉质量分数 w_(Cd)/ (mg∙kg⁻¹)	有效态镉质量分数 w_{(available Cd)}/ (mg∙kg⁻¹)	砷质量分数w_(As)/ (mg∙kg⁻¹)	有效态砷质量分数 w_{(available As)}/ (mg∙kg⁻¹)	阳离子交换量 Cation exchange capacity/(cmol∙kg⁻¹)	pH	有机质质量分数 w_{(soil organic matter)}/ （g∙kg⁻¹）	污染类型 Pollution type
渌口区 Lukou district	0.93	0.27	7.80	0.04	11.60	5.75	51.40	单一镉污染 Cd contaminated soil
浏阳市 Liuyang city	0.78	0.50	47.90	0.96	7.10	5.88	32.80	镉砷复合污染 Cd-As contaminated soil

试验地点 Experimental location	镉质量分数 w_(Cd)/ (mg∙kg⁻¹)	有效态镉质量分数 w_{(available Cd)}/ (mg∙kg⁻¹)	砷质量分数w_(As)/ (mg∙kg⁻¹)	有效态砷质量分数 w_{(available As)}/ (mg∙kg⁻¹)	阳离子交换量 Cation exchange capacity/(cmol∙kg⁻¹)	pH	有机质质量分数 w_{(soil organic matter)}/ （g∙kg⁻¹）	污染类型 Pollution type
渌口区 Lukou district	0.93	0.27	7.80	0.04	11.60	5.75	51.40	单一镉污染 Cd contaminated soil
浏阳市 Liuyang city	0.78	0.50	47.90	0.96	7.10	5.88	32.80	镉砷复合污染 Cd-As contaminated soil

处理编号 Test label	施用的螯合剂种类 Type of chelating agent	施用质量摩尔浓度 b/(mmol∙kg⁻¹)	施用方法 Application method
CK	—	—	—
EDTA	EDTA	2	单一施用
OA	OA	2	单一施用
TA	TA	2	单一施用
EDTA-OA	EDTA, OA	2	1꞉1组配施用
EDTA-TA	EDTA, TA	2	1꞉1组配施用
TA-OA	OA, TA	2	1꞉1组配施用

处理编号 Test label	施用的螯合剂种类 Type of chelating agent	施用质量摩尔浓度 b/(mmol∙kg⁻¹)	施用方法 Application method
CK	—	—	—
EDTA	EDTA	2	单一施用
OA	OA	2	单一施用
TA	TA	2	单一施用
EDTA-OA	EDTA, OA	2	1꞉1组配施用
EDTA-TA	EDTA, TA	2	1꞉1组配施用
TA-OA	OA, TA	2	1꞉1组配施用

处理编号 Test label	修复后土壤全量Cd 质量分数 w_{( Cd in the restored soi)}/(mg∙kg⁻¹)	修复后土壤有效态Cd 质量分数 w_{(available Cd in the restored soi)}/(mg∙kg⁻¹)
CK	0.77±0.02a	0.16±0.03a
EDTA	0.70±0.01bc	0.19±0.08a
OA	0.71±0.02b	0.22±0.07a
TA	0.71±0.03bc	0.23±0.01a
EDTA-OA	0.69±0.03bc	0.16±0.03a
EDTA-TA	0.66±0.03c	0.18±0.02a
TA-OA	0.68±0.03bc	0.19±0.05a

Effects of Chelating Agents and Thier Combinations on Remediation of Two Cadmium Contaminated Soils by Sedum plumbizincicola

螯合剂及组配对伴矿景天修复两种镉污染土壤的影响

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处理编号 Test label	修复后土壤全量Cd 质量分数 w_{(Cd in the restored soi)}/(mg∙kg⁻¹)	修复后土壤有效态Cd 质量分数 w_{(available Cd in the restored soi)}/(mg∙kg⁻¹)
CK	0.69±0.08a	0.46±0.06a
EDTA	0.65±0.08ab	0.49±0.03a
OA	0.63±0.02b	0.52±0.06a
TA	0.70±0.04a	0.51±0.04a
EDTA-OA	0.59±0.08c	0.47±0.03a
EDTA-TA	0.64±0.01ab	0.49±0.04a
TA-OA	0.61±0.04bc	0.51±0.06a

处理编号 Test label	修复前土壤Cd质量分数 w_{(Cd in unrestored soi)}/ (mg∙kg⁻¹)	植株地上部分Cd质量分数 w_{(Cd in plant aerial portion)}/ (mg∙kg⁻¹）	植株地上部分烘干质量 m_{(plant aerial portion)}/ (kg∙hm⁻²)	Cd提取量 Cd extraction quantity/ （mg∙hm⁻²）	修复效率 Remediation efficiency/ %
CK	0.87±0.05	58.53±2.24f	4.60×10³	2.69×10⁵	13.76
EDTA	0.92±0.07	91.59±3.31c	4.70×10³	4.30×10⁵	20.79
OA	0.90±0.11	79.30±2.77d	4.59×10³	3.64×10⁵	17.97
TA	0.91±0.05	73.63±3.02e	4.62×10³	3.40×10⁵	16.62
EDTA-OA	0.93±0.09	103.88±3.74a	4.60×10³	4.77×10⁵	22.82
EDTA-TA	0.90±0.08	95.04±2.68b	4.68×10³	4.45×10⁵	21.96
TA-OA	0.92±0.10	92.95±2.37c	4.61×10³	4.29×10⁵	20.71

处理编号 Test label	修复前土壤Cd质量分数 w_{(Cd in unrestored soi)}/ (mg∙kg⁻¹)	植株地上部分Cd质量分数 w_{(Cd in plant aerial portion)}/ (mg∙kg⁻¹）	植株地上部分烘干质量 m_{(plant aerial portion)}/ (kg∙hm⁻²)	Cd提取量 Cd extraction quantity/ （mg∙hm⁻²）	修复效率 Remediation efficiency/ %
CK	0.79±0.04	48.34±2.09f	4.70×10³	2.27×10⁵	12.79
EDTA	0.82±0.08	80.98±3.55c	4.80×10³	3.89×10⁵	21.06
OA	0.80±0.07	77.07±3.14d	4.69×10³	3.61×10⁵	20.09
TA	0.83±0.08	64.18±2.87e	4.70×10³	3.02×10⁵	16.06
EDTA-OA	0.76±0.05	90.14±3.26a	4.75×10³	4.28×10⁵	24.98
EDTA-TA	0.81±0.06	81.77±2.73c	4.73×10³	3.87×10⁵	21.14
TA-OA	0.78±0.05	84.46±3.04b	4.71×10³	3.98×10⁵	22.62

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