9/3/2023 0 Comments Chelated chromium chloride![]() ![]() ![]() Manuscripts based on our work will now be summarized:ĭissolution of Amorphous Chromium (Hydr)Oxide by (Amino)Carboxylate Chelating AgentsĬhromium-contaminated sediments (e.g., Baltimore Harbor) and soils (e.g., Hudson County, New Jersey) occur at several U.S. Our work focuses on two first-row transition metals, chromium and manganese. Herbicides used for weed control at brownfield sites may also come into direct contact with chromium-contaminated soils.Ĭhelating agents can yield problematic mixture effects on contact with contaminant-derived metal ions and even with some naturally-occurring metal ions. Residential and agricultural uses of such herbicides represent potential nonpoint sources for chelating agent entry into surface waters. Glyphosate and a handful of other herbicides possess chelating agent properties. ![]() Cooling water systems, boiler operations, oil drilling operations, and hydrothermal energy operations use chelating agents for scale and corrosion control. Chelating agents are used to sequester the transition metal ions iron, manganese, and copper during pulp and paper bleaching. Chelating agent use in large industrial water-based operations is also commonplace. Chelating agents that are not mineralized during waste treatment may enter the environment via wastewater effluent or the land disposal of biosolids. Summary/Accomplishments (Outputs/Outcomes):Ĭhelating agents are part of many household formulations, including detergents, cleansers, and shampoos. The objectives of this research project were to: (1) identify ways in which contaminant metal ions are rendered more toxic or otherwise problematic through reaction with naturally occurring or contaminant-derived chelating agents and (2) identify synthetic chelating agents, which are innocuous as free species but yield toxic or unusually reactive species when they react with naturally-occurring metal ions. This work focused on metal ion-chelating agent mixtures that yield adverse environmental impacts that cannot be anticipated by studying either the metal ion or the chelating agent alone. Research Category: Hazardous Waste/Remediation Institution: The Johns Hopkins University Title: Toxic Metal Ion-Synthetic Chelating Agent Interactions in Aqueous Media Final Report: Toxic Metal Ion-Synthetic Chelating Agent Interactions in Aqueous Media EPA Grant Number: R829356 ![]()
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