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Quantification of Nano Zero-Valent Iron (nZVI) in Soil by a Chemical Redox Probe for Soil Invertebrate Toxicity Testing

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Title: Quantification of Nano Zero-Valent Iron (nZVI) in Soil by a Chemical Redox Probe for Soil Invertebrate Toxicity Testing
Author: Akre, Robyn
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Hale, Beverley
Abstract: Nano zero-valent iron (nZVI) has been used for years in remediating contaminated groundwater and has recently been proposed as a method for soil remediation. It can reduce toxicity of many persistent contaminants through degradation and immobilization. Before nZVI can be used in soil, testing must assess potential toxicity of nZVI and a method for quantifying nZVI in soil must be developed. The purpose of this research was to adapt a quantification method using indigo disulfonate and assess the toxicity of nZVI to soil invertebrates. A standard curve was developed by reacting indigo disulfonate with nZVI and measuring the absorbance. This was used to measure nZVI in pore water extracted from nZVI amended soils. However, the measurements were inconsistent due to the presence of oxygen. Toxicity to Folsomia candida and Eisenia andrei was assessed using endpoints of avoidance, lethality, and reproduction. Only slight toxicity was found in survival of F. candida.
URI: https://hdl.handle.net/10214/21285
Date: 2020-09
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International


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Attribution-NonCommercial-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International