草酸和酒石酸对稻田土壤中砷解吸行为的影响研究

doi:10.16258/j.cnki.1674-5906.2024.08.014

生态环境学报 ›› 2024, Vol. 33 ›› Issue (8): 1298-1305.DOI: 10.16258/j.cnki.1674-5906.2024.08.014

• 研究论文【环境科学】 • 上一篇下一篇

草酸和酒石酸对稻田土壤中砷解吸行为的影响研究

陈文哲¹^,²(), 黄秋香³, 孟凡德¹^,²^,⁴^,^*(), 高金妍¹^,², 李敏⁵, 张恩俊³, 袁国栋⁴^,^*()

1.安徽科技学院资源与环境学院，安徽凤阳 233100
2.安徽省农业废弃物肥料化利用与耕地质量提升工程研究中心，安徽凤阳 233100
3.安徽科技学院化学与材料工程学院，安徽蚌埠 233030
4.广东省环境健康与资源利用重点实验室，肇庆学院，广东肇庆 526061
5.安徽珍昊环保科技有限公司，安徽凤阳 233100

收稿日期:2024-04-26 出版日期:2024-08-18 发布日期:2024-09-25
通讯作者: 袁国栋。E-mail: yuanguodong@zqu.edu.cn
*孟凡德。E-mail: mengfd@ahstu.edu.cn；
袁国栋。E-mail: yuanguodong@zqu.edu.cn
*孟凡德。E-mail: mengfd@ahstu.edu.cn；
作者简介:陈文哲（1999年生），女，硕士研究生，主要从事土壤重金属污染修复研究。E-mail: 1653501838@qq.com
基金资助:
国家自然科学基金项目(42305127);环境地球化学国家重点实验室开放基金项目(SKLEG2023205);安徽省高等学校自然科学研究项目(2022AH051628);安徽省高等学校自然科学研究项目(2023AH051860);广东省环境健康与资源利用重点实验室开放基金项目(2020B121201014);安徽科技学院发展基金项目(811487);大学生创新课题(S202110879245);大学生创新课题(S202210879120)

Impacts of Oxalic and Tartaric Acids on Arsenic Desorption from a Paddy Soil

CHEN Wenzhe¹^,²(), HUANG Qiuxiang³, MENG Fande¹^,²^,⁴^,^*(), GAO Jinyan¹^,², LI Min⁵, ZHANG Enjun³, YUAN Guodong⁴^,^*()

1. College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, P. R. China
2. Anhui Province Agricultural Waste Fertilizer Utilization and Cultivated Land Quality Improvement Engineering Research Center, Fengyang 233100, P. R. China
3. College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233030, P. R. China
4. Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Zhaoqing University, Zhaoqing 526061, P. R. China
5. Anhui Zhenhao Environmental Protection Technology Co., Ltd, Fengyang 233100, P. R. China

Received:2024-04-26 Online:2024-08-18 Published:2024-09-25

摘要/Abstract

摘要：

低分子量有机酸（Low molecular weight organic acids，LMWOAs），如草酸（Oxalic Acid，OA）和酒石酸（Tartaric Acid，TA），是土壤水溶性有机质（DOM）的重要组成部分，对土壤（类）重金属的吸附和解吸行为具有明显的影响。以As污染超标土壤为研究对象，利用泡桐制备的生物炭（BC），通过批解吸试验研究了TA和OA对土壤中As解吸行为的影响，分析了BC对OA和TA影响土壤As解吸行为的作用，探讨了可能的作用机理。结果表明，OA和TA均能降低土壤pH，且其浓度越高pH值越小；OA对土壤pH的作用强于TA，在40 mmol∙L⁻¹时pH分别降为1.89和2.62。BC的添加未改变土壤pH降低的趋势，但减小了pH降低的幅度，OA和TA在40 mmol∙L⁻¹时使pH分别降为2.34和2.72，BC使土壤pH分别提升了0.45和0.10。OA和TA明显影响土壤As的解吸行为，As的解吸量随OA或TA浓度的增加而先降低后增加；OA对土壤As的解吸量明显高于TA。BC的添加未改变土壤As的解吸趋势，但使OA和TA对土壤As的解吸量分别增加了15%-98%和21%-509%。OA和TA可能是通过降低pH和羧基结合作用而影响土壤As的解吸行为，BC的添加可能提升DOM含量和土壤表面质子化反应而促进As的解吸。结合Langmuir和Freundlich模型分析，OA和TA对土壤As的解吸主要以其与As化学结合作用为主。该研究成果有助于加深对LMWOAs对土壤As解吸行为影响的认识，明晰了生物炭修复As污染土壤存在的风险，对土壤污染防控具有重要的参考价值。

关键词: 酒石酸, 草酸, 生物炭, 砷, 解吸行为

Abstract:

Low-molecular-weight organic acids (LMWOAs) are important components of dissolved organic matter (DOM) in soil. They are widely distributed and play an important role in controlling the geochemical behavior of heavy metal(loid)s in soil environments. In this study, As-contaminated paddy soil was sampled and biochar was produced from Paulownia fortune. The effects of oxalic acid (OA) and tartaric acid (TA), two common LMWOAs, on As desorption from the soil were investigated. The role of biochar in altering As desorption was assessed and the mechanisms involved were investigated. The results showed that both OA and TA decreased soil pH in a concentration-dependent manner; OA had a stronger effect than TA, and soil pH decreased to 1.89 and 2.62 for OA and TA at 40 mmol∙L^-1. Biochar addition alleviated the pH reduction, reducing the pH to 2.34 and 2.72, indicating that biochar enhanced soil pH values of 0.45 and 0.10 OA and TA, respectively. OA and TA had significant effects on As desorption from the soil. The arsenic desorption mass increased with the OA and TA concentrations, and OA induced a higher As desorption mass than TA. The Addition of biochar increased the AS desorption mass by 15%-98% and 21%-509% for OA and TA, respectively. The primary possible mechanisms by which TA and OA alter As desorption from the soil are pH reduction and complexation with As via carboxyl groups. The addition of BC increased As desorption, mainly owing to the introduction of DOM and protonation caused by biochar. This study deepened our understanding of the effects of LMWOAs on As geochemistry in soil environments and revealed the potential risks of biochar use as an amendment in As-contaminated soils.

Key words: tartaric acid, oxalic acid, biochar, arsenic, desorption behavior

中图分类号:

X131.3
X53

陈文哲, 黄秋香, 孟凡德, 高金妍, 李敏, 张恩俊, 袁国栋. 草酸和酒石酸对稻田土壤中砷解吸行为的影响研究[J]. 生态环境学报, 2024, 33(8): 1298-1305.

CHEN Wenzhe, HUANG Qiuxiang, MENG Fande, GAO Jinyan, LI Min, ZHANG Enjun, YUAN Guodong. Impacts of Oxalic and Tartaric Acids on Arsenic Desorption from a Paddy Soil[J]. Ecology and Environment, 2024, 33(8): 1298-1305.

图/表 6

表1 土壤和生物炭理化性质

Table 1 The basic properties of soil and biochar

样品	pH	黏粒	粉粒	砂粒	有机碳	As	灰分	羧基	酚羟基	比表面积/ (m²∙g⁻¹)
样品	pH	w/%				w/(mg∙kg⁻¹)	w/%	b/(mol∙kg⁻¹)		比表面积/ (m²∙g⁻¹)
S1	5.99	15.8	61.8	22.4	1.01%	319.53	‒	‒	‒	‒
BC	7.98	‒	‒	‒	69.58	‒	20.85	0.46	0.15	85.70

图1 生物炭的FTIR、XRD和SEM图

Figure 1 The FTIR spectrum, XRD pattern and SEM image of biochar

图2 TA和OA对土壤pH的影响

Figure 2 The effects of TA and OA on soil pH

图3 TA和OA对土壤As解吸的影响

Figure 3 The effects of TA and OA concentrations on the desorption of As in S1 and S1-BC

图4 TA和OA对土壤As的解吸热力学拟合曲线

Figure 4 Isotherms of As desorption from soil affected by TA and OA

表2 土壤As的热力学解吸参数

Table 2 Parameters of desorption isotherms for As in S1 and S1-BC

土壤	有机酸	Langmuir			Freundlich
土壤	有机酸	q_m/(mg∙kg⁻¹)	k_L	R²	n	k_F	R²
S1	OA	462.23	0.004	0.964	1.022	1.68	0.962
S1	TA	34.12	0.015	0.946	1.232	0.66	0.935
S1-BC	OA	‒	‒	‒	0.904	2.04	0.987
S1-BC	TA	27.51	0.033	0.990	1.563	1.50	0.986

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草酸和酒石酸对稻田土壤中砷解吸行为的影响研究

Impacts of Oxalic and Tartaric Acids on Arsenic Desorption from a Paddy Soil

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