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异化铁还原诱导次生铁矿对土壤重金属形态转化的影响

罗海林1,2,汤佳2,周普雄1,2,余震2*,符桂华3,周顺桂1   

  1. 1福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002;2广东省生态环境技术研究所,广东省农业环境综合治理重点实验室, 广州 510650;3湖南省桃源县农业局, 湖南常德 415700)
  • 出版日期:2018-06-10 发布日期:2018-06-10

Influence of secondary iron-oxide mineralization induced by dissimilatory iron reduction bacteria on fraction transformation of heavy metals in soil.

LUO Hai-lin1,2, TANG Jia2, ZHOU Pu-xiong1,2, YU Zhen2*, FU Gui-hua3, ZHOU Shun-gui1   

  1. (1Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, China; 3Taoyuan County Agriculture Bureau of Hunan Province, Changde 415700, Hunan, China).
  • Online:2018-06-10 Published:2018-06-10

摘要: 土壤重金属具有残留时间长、毒性大、难迁移等特点,其形态转化又是影响重金属毒性和迁移的关键因子。同时,不同形态土壤重金属通过迁移进入到作物、水、大气循环中,对人类的健康构成极大威胁。厌氧条件下,土壤中丰富的铁含量和微生物异化铁还原过程为自然环境中不同晶型次生铁矿的形成提供了有利条件。微生物诱导生成的次生铁矿物有独特的形态和特征,如纳米颗粒、高表面积和高反应活性,这些矿物特征对土壤重金属形态转化起到重要作用。本文重点介绍在异化铁还原微生物驱动下次生铁矿形成过程对土壤重金属形态转化的影响效应及机制。次生铁矿物形成过程直接影响土壤中微量金属污染物的迁移转化及归宿,因此在重金属污染场地修复等方面具有很重要的应用前景。

关键词: 联合毒性, 蚯蚓, 消化酶, 抗生素, 重金属

Abstract: Heavy metals in soil have the characteristics of persistent accumulation, high toxicity, and difficult to migrate. The fraction transformation is an important process influencing the toxicity and migration of heavy metals. It could be harmful to human health if heavy metals transferred into crops, water and atmosphere. Under anaerobic conditions, the existence of abundant iron and microbial Fe(III) dissimilatory reduction in soils provide favorable conditions for the formation of secondary iron minerals with different crystalline forms in the natural environment. Secondary iron minerals induced by microorganisms have unique morphology and characteristics, including nanoparticles, high surface area, and high reactivity, which play important roles in the transformation of soil heavy metals. In this review, we summarized the impacts of secondary iron mineralization driven by ironreducing bacteria on the transformation of heavy metals in soils. The secondary iron mineralization directly influences the fate of heavy metals. Thus, better understanding of the mechanisms is fundamental to its application in bioremediation.

Key words: digestive enzyme., antibiotics, combined toxicity, earthworm, heavy metal