Toxicity Evaluation of Nano-Zero Valent Iron to Soil Indigenous Microorganisms

摘要：

　　The objective of this study was to evaluate the toxicity of nZVI to the indigenous microorganisms of the soil.The toxicity of nZVI was assessed by the CO2 production for the soil native microorganisms.Different concentrations of nZVI were added to the soil(0,4,15 and 50 g/kg)for further analysis of the microbiological activity.For a better interpretation of toxicity effects,was used glucose(g/kg)as a carbon source.As soil mixtures,nZVI and glucose were inserted into sealed vials for an evaluation of the microbiological activity.The quantification of CO2 produced by the indigenous microbes respiration was performed by stoichiometry,using NaOH to absorb the gas and using HCl to determine the concentration.The analyzes were performed every 02 days,until a total monitoring time of 40 days.It was observed that at a concentration of 50 g/kg it has not released any carbon dioxide,demonstrating a maladaptation of the microorganisms under these conditions.The nZVI concentrations of 4 and 15 g/kg showed an increase of CO2 production,indicating an adaptation of the microorganisms as available conditions.Thus,the application of nZVI as remediation technology can be performed up to concentrations of 15 g/kg without causing damage to native soil microorganisms.However,applications above these may cause toxic and/or inhibitory effects to the microbes,restricting a possible combination of nano and bioremediation.

关键词： Nanoremediation Toxicity Microorganism

作者: Iziquiel Cecchin Eloisa Fernanda Tessaro Cleomar Reginatto Antonio Thome Krishna R.Reddy

作者单位: Federal University of Porto Alegre,Rio Grande do Sul,Brazil University of Passo Fundo,Rio Grande do Sul,Brazil University of Illinois at Chicago,Illinois,USA

会议类型: 国际会议

会议名称: The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)

会议地点: 杭州

会议语种:英文

页码: 882-892

在线出版日期: 2018-10-28（万方平台首次上网日期，不代表论文的发表时间）