摘要
针对酸性土壤退化和重金属活性高的问题,为了寻求一种综合改善土壤酸性和控制重金属风险的改良技术,基于室内土培试验,通过将蚯蚓粪、零价铁和磷矿粉进行不同形式的组配,分析其对土壤理化性质和重金属镉铅活性的影响,最终筛选出适宜的酸性土壤改良剂。结果表明,加入改良剂后土壤p H值提升了0.17~1.33个单位,有机质质量分数增加了30.7%~124.5%,阳离子交换量提升了371%~627%,均显著改善了土壤理化性质。有机-无机组配材料对重金属Cd、Pb的钝化效果显著,其中蚯蚓粪+零价铁(VCFe)和蚯蚓粪+零价铁+磷矿粉(1∶1∶1,V1F1P1)处理的土壤Cd、Pb有效态含量降低45.4%~59.0%,钝化效果最佳。Tessier形态分析结果表明,这2种改良剂能够将Cd从活性较高的可交换态向活性较低的铁锰氧化态和残渣态转化,将Pb从可交换态、碳酸盐结合态向残渣态转化。组配材料通过改变土壤理化性质而影响到Cd、Pb部分形态转化,进一步影响到其有效性和迁移性。
The present paper is aimed at improving the acid soil quality by choosing and adopting an integrated remediation measure or means to degrade the heavy metal pollution on the acid soil.The measure we would like to take may include a batch of experiments,a set of control measures without any amendment(CK),vermicompost(VC),vermicompost+zero-valent iron(ZVI)(1∶1,VCFe),vermicompost+phosphate rock(PR)(1∶1,VCP),vermicompost+ZVI+PR(1∶1∶1,V1 F1 P1,in addition to the 3∶2∶1,V3 F2 P1;3∶1∶2,V3 F1 P2).To achieve the given purpose,we have managed to assess the remediation effectiveness so as to screen out suitable amendments for the acid soil by analyzing the soil properties,the soil content of available Cd and Pb with their species distribution situation.The soil features or the specific constituent elements have been assessed and further promoted noticeably as a result of remediation with p H value by a rate of 0.17-1.33 units,and its organic substance elements increased by 30.7%-124.5%.And,accordingly,the cation exchange capacity of the soil has been increased by 371%-627%.What is more,the vermicompost made a great contribution to the improvement of the p H value,and V1 F1 P1 enjoys the idealistic effectiveness on improving the cation exchange capacity.The VCFe and V1 F1 P1 treatment can help to reduce 45.5%-59.0%of the available Cd and Pb contaminants,which suggests that the VCFe and V1 F1 P1 treatment enjoys a much greater potential in controlling the heavy metal risk than the other amendments.Furthermore,VCFe and V1 F1 P1 can also promote transformation of Cd from exchangeable frictions to Fe/Mn oxide fractions and the residual fractions,and promote transformation of Pb from exchangeable frictions and carbonate bound fractions to the residual fractions.The Pearson correlation analysis demonstrates that the specific soil features under study ought to be potentially correlated with some fractions of Cd and Pb,signifying that the change of the soil features and properties imply obvious decrease of the metal m
作者
潘攀
刘贝贝
吴琳
符旖晴
武春媛
李勤奋
苏剑程
PAN Pan;LIU Bei-bei;WU Lin;FU Yi-qing;WU Chun-yuan;LI Qin-fen;SU Jian-cheng(Key Laboratory of Original Agro-Environmental Pollution Prevention and Control,Ministry of Agricultureand Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Safe-Product,Tianjin 300191,China;Institute of Environment and Plant Protection,Chinese Academy of Tropical Agricultural Science,Haikou 571101,China;Agricultural Emnvironmental Scicnce Observation ard Experiment Station,Ministry of Agriculture and Rural Affairs,Danzhou 571737,Hainan,China;Hainan Star Farmer Eeological Technology Co.,Ld.,Haikou 571101,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2020年第4期1549-1557,共9页
Journal of Safety and Environment
基金
贵州省科技计划项目(黔科合支撑[2018]2338)
农业农村部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室开放基金项目(18nybcdhj-8)
中国热带农业科学院基本科研业务费专项资金项目(1630042019004,1630042019045)。
关键词
环境学
酸性土壤
重金属
蚯蚓粪
零价铁
磷矿粉
environmentalology
acid soil
heavy metal
vermicompost
zero-valent iron
phosphate rock
