Submitted to: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/28/2006
Publication Date: 4/17/2007
Citation: Popov, K., Glazkova, I., Myagkov, S., Petrov, A., Sedykh, E., Bannykh, L., Yachmenev, V. 2007. Zeta-potential of concrete in presence of chelating agents. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 299:198-202.
Interpretive Summary: Contamination of concrete by radionuclides/heavy metals/organic contaminants at various NPP, reprocessing facilities and contaminated sites is a significant worldwide problem. Electrokinetic techniques (EK) for remediation of porous solid media (concrete, heavy clay soils, etc) contaminated with a variety of contaminants rapidly becoming a very attractive alternative to traditional expensive and labor–intensive methods for decontamination of solid porous media without destruction of the solid matrix. This in-situ extraction technique utilizes a direct current (DC) electric field to transport charged contaminant species throughout the work solution to a collection zone. Likewise, non-charged, organic contaminants could be flushed and extracted from the contaminated porous solid matrix by exploiting electroosmosis phenomena, which is a flow of pore liquid in porous matrix, induced by an electric field gradient. This effect also opens interesting possibilities for development not only variety of new techniques for controlled remediation of porous solid media but also novel ways of delivery of nutrients and/or pesticides/fungicides throughout soil matrix to the plant roots. The present paper is exploring the phenomena of the enhancement of zeta-potential (key parameter, characterizing the feasibility of EK application) by certain chelating agents. Groups benefiting from this development include the industrial, academic scientists and, and agricultural consumers of scientific information.
Technical Abstract: Contamination of concrete surfaces at Nuclear Power Plants (NPP) and reprocessing facilities by radionuclides/heavy metals is a significant and widespread problem throughout the world’s Nuclear Power Industries. The current study of the zeta-potentials (') of concrete particles in the presence of various chelating agents such as: ethylenediaminetetraacetic acid (EDTA), nitrilotrimethylenephosphonic acid (NTPH) and citric acid was conducted to examine and facilitate the use of electrokinetic techniques (EK) for the remediation of the contaminated concrete surfaces. The experimental data indicated significant enhancement and even a change of concrete surface charge from positive in distilled water (DI) to negative one in presence of 0.1 mol/L solutions of chelating agents.