Video Experimental Relacionado
Updated: Feb 14, 2026

03:55
A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria
Published on: June 27, 2022
4.2K
Detección de alta sensibilidad de iones negativos en la estratosfera
Nature
|February 17, 2018
Resumen
La composición de iones negativos en la estratosfera se midió con instrumentos en globo. Las mediciones de mayor sensibilidad revelaron especies de iones no detectadas previamente en la estratosfera.
Área de la Ciencia:
- Química atmosférica
- Ciencias de los aerosoles
- Química de iones
Sus antecedentes:
- Las primeras mediciones del espectrómetro de masas en globo identificaron los principales iones negativos estratosféricos como los complejos de nitrato (NO3-) y sulfato (HSO4-).
- La formación de núcleos de sulfato a partir de núcleos de nitrato a través de reacciones con vapor de ácido sulfúrico fue apoyada por estudios de laboratorio.
- Los avances instrumentales han mejorado el rango de masa, la sensibilidad y la resolución, extendiendo las altitudes de detección.
Objetivo del estudio:
- Informar de las mediciones in situ de la composición de iones negativos en la estratosfera.
- Detectar especies de iones no observadas con anterioridad utilizando instrumentos de mayor sensibilidad.
Principales métodos:
- Espectrometría de masas de iones en globo.
- Mediciones in situ de los iones negativos de la estratosfera.
- Análisis de masa de alta sensibilidad.
Principales resultados:
- Detección de los principales iones negativos estratosféricos: complejos de nitrato (NO3-) y sulfato (HSO4-).
- Confirmación de la formación de núcleos de sulfato a partir de núcleos de nitrato.
- Identificación de especies de iones negativos no observadas anteriormente debido a una mayor sensibilidad del instrumento.
Conclusiones:
- La espectrometría de masas avanzada permite la detección de nuevos iones negativos estratosféricos.
- Estos hallazgos contribuyen a una comprensión más completa de la química iónica estratosférica y la formación de aerosoles.
Videos de Conceptos Relacionados
Ions and Ionic Charges
79.5K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
79.5K
Common Ion Effect
47.1K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
47.1K
Precipitation of Ions
30.4K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
30.4K
Ion Channels
91.6K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.6K
Formation of Complex Ions
26.3K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
26.3K
Ions as Acids and Bases
26.8K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.8K

