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H SINK [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2010-06-07

English

Subject field(s)
  • Chemical Elements and Compounds
  • Pollutants
  • Climate Change
Universal entry(ies)
HO
formula
CONT

From the fuel itself, the engines also produce oxides of hydrogen, which include water, and which the chemists collectively dub HOx. Water itself does not destroy ozone, but the hydroxyl radical, HO, does, through a similar set of reactions to the ones involving NO. McDonald himself wasn’t concerned about the effects of NOx on the stratosphere, but he began to be worried that HOx might have a serious effect on the ozone layer.

CONT

Another sink for ozone involves fragments of water molecules. Water vapor occurs naturally in the stratosphere, and water molecules are also split apart by ultraviolet rays, giving a collection of hydrogen atoms(H), hydroxyl radicals(HO) and hydroperoxyl radicals(HOO). Collectively they can be symbolized by HOx. These remove ozone(or oxygen atoms needed to make ozone).

OBS

hydrogen oxide; oxide of hydrogen: dubious names.

French

Domaine(s)
  • Éléments et composés chimiques
  • Agents de pollution
  • Changements climatiques
Entrée(s) universelle(s)
HO
formula
DEF

oxydes d'hydrogène : Collectivement, substances qui contiennent à la fois de l'oxygène et de l'hydrogène et qui constituent un piège important pour l'ozone.

OBS

Par le symbole HOx on désigne surtout les radicaux HO et HO2, qui sont des constituants de la stratosphère.

CONT

Les scientifiques ont calculé que les oxydes d'azote pouvaient détruire jusqu'à 9 % de l'ozone de la stratosphère (de 15 à 50 km d'altitude), tandis que les oxydes d'hydrogène étaient responsables de la destruction de quelques 70 % de l'ozone de la mésosphère (entre 50 et 90 km).

Spanish

Save record 1

Record 2 2003-01-31

English

Subject field(s)
  • Chemistry
  • Chemical Elements and Compounds
  • Climate Change
CONT

Another sink for ozone involves fragments of water molecules. Water vapor occurs naturally in the stratosphere, and water molecules are also split apart by ultraviolet rays, giving a collection of hydrogen atoms(H), hydroxyl radicals(HO) and hydroperoxyl radicals(HOO). Collectively they can be symbolized by HOx.

OBS

hydrododioxygen(·); HO2· radical: The dot must be centered and pronounced after the name: "hydridodioxygen dot"; "HO2 dot radical."

French

Domaine(s)
  • Chimie
  • Éléments et composés chimiques
  • Changements climatiques
CONT

Il apparaît que la chimie des oxydes d'azote, de soufre et de carbone, de l'ozone et des constituants organiques, qui met toujours en jeu les radicaux hydroxyles et hydropéroxyles, forme un tout indissociable qui ne peut être appréhendé que dans son ensemble. Ces mécanismes contrôlent, en particulier, la formation des photooxydants et d'une partie des acides dans la basse troposphère.

OBS

Ce radical résulte de la rupture des molécules d'eau présentes dans la stratosphère, rupture provoquée par les rayons ultraviolets.

OBS

hydrurodioxygène(·); radical HO2·: Le point est un point centré; pour les noms des radicaux comportant un point centré, il faut prononcer «dot» en anglais et «point» en français après le nom : «hydrurodioxygène point»; «radical HO2 point».

Spanish

Save record 2

Record 3 1985-11-20

English

Subject field(s)
  • Air Pollution
  • Chemical Elements and Compounds
  • Soil Science
CONT

For Woods Lake, the deposition of atmospheric H+ could account for all of the net loss of basic cations and therefore, is at least as large as the net internal generation of H+. In addition, there is an unknown sink of H+ with the system. The working hypothesis that is currently being tested is : The unknown sink for atmospheric H+ within the system is anion adsorption.

OBS

H+.

French

Domaine(s)
  • Pollution de l'air
  • Éléments et composés chimiques
  • Science du sol
CONT

Même si l'adsorption sur des particules et les réactions avec ces particules, avec des oxydes de Fe et de Mn et avec des matières organiques peuvent agir comme puits pour le H+, ces composantes alcalines sont, semble-t-il, relativement peu importantes dans les lacs étudiés jusqu'à présent.

OBS

H+.

Spanish

Save record 3

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