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天然矿物复配腐植酸对农田镉的钝化机理研究
姜洁如, 林亲铁, 张晓峰, 钟松雄, 尹光彩, 王煜林, 陈光毅, 罗昊昱, 黄润林
广东工业大学环境科学与工程学院
摘要:
采用田间试验研究了改良剂(腐植酸)及由膨润土、硅藻土、氧化镁组配的钝化剂对土壤镉(Cd)的钝化效果及对土壤理化性质的影响,并借助红外光谱仪(FTIR)、扫描电镜联用能谱分析仪(SEM-EDS)和比表面分析仪(BET),分析探讨了钝化改良剂对镉的钝化机理。结果表明:不同钝化改良剂处理初始有效态镉浓度为0.0836 mg/kg的菜地土壤70 d后,镉的钝化效率由高到低依次为:1% 钝化剂 + 0.04% 改良剂>10g/kg钝化剂>5g/kg 钝化剂 + 0.4 g/kg 改良剂>5 g/kg 钝化剂>0.4 g/kg 改良剂,其中10 g/kg 钝化剂 + 0.4 g/kg 改良剂对有效态镉的钝化效率达到60.2%。表征分析显示,钝化剂表面结构疏松,其表面的Na+、Ca2+、Mg2+ 等离子可与Cd2+发生离子交换反应,改良剂中含有醌基、醇羟基、羧基、羰基和C=C键,能与Cd2+ 发生配位络合作用,化学吸附是复配钝化改良剂降低土壤镉有效性的主要原因。
关键词:  土壤    钝化  腐植酸  天然矿物
DOI:10.13758/j.cnki.tr.2019.02.018
分类号:X53;S156
基金项目:国家重点研发计划项目(2017YFD0801302)、国家自然科学基金项目(21677041;41371317)和广州市科技计划项目(201604030017;201604020077) 资助。
Immobilization of Cd in Contaminated Farmland by Natural Minerals Combined with Humic Acid
JIANG Jieru, LIN Qintie, ZHANG Xiaofeng, ZHONG Songxiong, YIN Guangcai, WANG Yulin, CHEN Guangyi, LUO Haoyu, HUANG Runlin
School of Environmental Science and Engineering, Guangdong University of Technology
Abstract:
The stabilizing effects of improved bentonite-diatomite-magnesia-humic acid composite curing agent on soil available Cd and its influence on soil physicochemical properties were investigated, and the related mechanisms were also studied by adopting FTIR, SEM-EDS and BET analyses. Results showed that after 70-day treatment, the concentration of available Cd in soil, which was initially 0.0836 mg/kg, decreased significantly. The stabilizing efficiencies of different composite curing agents were in an order of 10 g/kg curing agent +0.4 g/kg humic acid > 10 g/kg curing agent > 5 g/kg curing agent + 0.4g/kg humic acid > 5g/kg curing agent > 0.4 g/kg humic acid. In particular, the stabilizing efficiency reached 60.2% for 10 g/kg curing agent + 0.4 g/kg humic acid treatment. SEM-EDS and BET analyses revealed that the curing agent exhibited loose surface structure, the existence of ions on the surface, which included Na+, Ca2+, Mg2+, could contribute to chemical adsorption through ion exchange. Besides, functional groups such as quinone, alcohol, hydroxyl, carboxyl, carbonyl and C=C bond in humic acid could coordinate with Cd2+. Chemical absorption is the main reason to reduce the availability of soil Cd.
Key words:  Cadmium  Immobilization  Humic acid  Natural minerals

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