Video Experimental Relacionado
Updated: Jul 11, 2026
09:33
An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
Dispersión de mercurio de fuentes de barro en el drenaje del río Kuskokwim, Alaska
Science (New York, N.Y.)
|November 25, 1977
Resumen
El río Kuskokwim muestra niveles anómalos de mercurio del cinabrio natural, no de la contaminación industrial. Este mercurio se dispersa aguas abajo, principalmente a través de afluentes y sedimentos finos, impactando el medio marino.
Área de la Ciencia:
- Ciencias ambientales Ciencias ambientales.
- La geoquímica es la geoquímica.
- Hidrología Hidrología Hidrología.
Sus antecedentes:
- El sistema del río Kuskokwim es un medio acuático significativo.
- Comprender la composición de los sedimentos y el agua es crucial para evaluar la salud ambiental.
Objetivo del estudio:
- Para investigar la fuente y distribución de concentraciones anómalas de mercurio en el río Kuskokwim.
- Para identificar las vías primarias de transporte de mercurio dentro del sistema fluvial.
Principales métodos:
- Análisis de los sedimentos del fondo para el contenido de partículas de mercurio y cinabrio.
- Examen de las fracciones de tamaño de los sedimentos y depósitos de las orillas de los ríos.
- Evaluación de los sedimentos en suspensión y el agua para los niveles de mercurio.
Principales resultados:
- Las anomalías de mercurio se originan en fuentes mineralizadas naturales que contienen cinabrio.
- La dilución aguas abajo se produce debido a la mezcla de sedimentos, pero las anomalías persisten.
- El transporte de mercurio es más extenso en afluentes, sedimentos finos, depósitos bancarios, sedimentos en suspensión y agua.
Conclusiones:
- El río Kuskokwim no está contaminado industrialmente con mercurio.
- El cinabrio natural en los sedimentos es la fuente de las anomalías de mercurio.
- Los sedimentos en suspensión y el agua son los principales contribuyentes de mercurio al medio marino.
Videos de Conceptos Relacionados
01:19Acid Mine Drainage
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
01:27Microbial Leaching
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
02:36Oxymercuration-Reduction of Alkenes
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
01:26Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...
01:03Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
01:27The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Periodic Table Provides Information...