Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Oxygen and Solution Composition on the Oxidative Dissolution of Cadmium Microparticles in Water
https://orcid.org/0000-0003-1537-5270
Cadmium is one of the most hazardous and toxic environmental pollutants. Metallurgical industry, waste incineration, and wide use of cadmium in modern devices have increased the spread of cadmium in the environment and enhanced its impact on human health. The paper discusses the state and transformation of 2–3 μm cadmium particles falling out on water bodies from air. The formation and characteristics of cadmium dispersions in water are studied. The aqueous dispersion is unstable, and microparticles undergo agglomeration, followed by sedimentation. The particle sedimentation velocity is about 1.0 × 10–5 m s–1 (±50%). Cadmium metal microparticles are efficiently oxidized in air to form Cd(OH)2. The thermodynamics and mechanism of the oxidative dissolution of cadmium in water are discussed in relation to the pH, concomitant ions, and other factors. The dissolution appreciably accelerates with increasing acidity and in the presence of the Cl– ions. The dissolution in waters of various compositions and of natural origin was studied. The results of the research establish the patterns of toxic cadmium spreading into the environment during the dissolution of metal microparticles in natural waters.
The process of dissolution of cadmium microparticles in river and seawater has not been fully studied. We have obtained radiation-chemically cadmium nanoparticles and examined their behavior in various aqueous media. This will help to find ways to improve the environment.
Effect of Oxygen and Solution Composition on the Oxidative Dissolution of Cadmium Microparticles in Water
https://orcid.org/0000-0003-1537-5270
Cadmium is one of the most hazardous and toxic environmental pollutants. Metallurgical industry, waste incineration, and wide use of cadmium in modern devices have increased the spread of cadmium in the environment and enhanced its impact on human health. The paper discusses the state and transformation of 2–3 μm cadmium particles falling out on water bodies from air. The formation and characteristics of cadmium dispersions in water are studied. The aqueous dispersion is unstable, and microparticles undergo agglomeration, followed by sedimentation. The particle sedimentation velocity is about 1.0 × 10–5 m s–1 (±50%). Cadmium metal microparticles are efficiently oxidized in air to form Cd(OH)2. The thermodynamics and mechanism of the oxidative dissolution of cadmium in water are discussed in relation to the pH, concomitant ions, and other factors. The dissolution appreciably accelerates with increasing acidity and in the presence of the Cl– ions. The dissolution in waters of various compositions and of natural origin was studied. The results of the research establish the patterns of toxic cadmium spreading into the environment during the dissolution of metal microparticles in natural waters.
The process of dissolution of cadmium microparticles in river and seawater has not been fully studied. We have obtained radiation-chemically cadmium nanoparticles and examined their behavior in various aqueous media. This will help to find ways to improve the environment.
Effect of Oxygen and Solution Composition on the Oxidative Dissolution of Cadmium Microparticles in Water
https://orcid.org/0000-0003-1537-5270
Cadmium is one of the most hazardous and toxic environmental pollutants. Metallurgical industry, waste incineration, and wide use of cadmium in modern devices have increased the spread of cadmium in the environment and enhanced its impact on human health. The paper discusses the state and transformation of 2–3 μm cadmium particles falling out on water bodies from air. The formation and characteristics of cadmium dispersions in water are studied. The aqueous dispersion is unstable, and microparticles undergo agglomeration, followed by sedimentation. The particle sedimentation velocity is about 1.0 × 10–5 m s–1 (±50%). Cadmium metal microparticles are efficiently oxidized in air to form Cd(OH)2. The thermodynamics and mechanism of the oxidative dissolution of cadmium in water are discussed in relation to the pH, concomitant ions, and other factors. The dissolution appreciably accelerates with increasing acidity and in the presence of the Cl– ions. The dissolution in waters of various compositions and of natural origin was studied. The results of the research establish the patterns of toxic cadmium spreading into the environment during the dissolution of metal microparticles in natural waters.
The process of dissolution of cadmium microparticles in river and seawater has not been fully studied. We have obtained radiation-chemically cadmium nanoparticles and examined their behavior in various aqueous media. This will help to find ways to improve the environment.
Effect of Oxygen and Solution Composition on the Oxidative Dissolution of Cadmium Microparticles in Water
Bykov, Gennadii L. (Autor:in) / Ershov, Boris G. (Autor:in)
ACS ES&T Water ; 4 ; 5669-5677
13.12.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
cadmium , sedimentation , dispersions , microparticles , dissolution , oxidation , hazard
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