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FREE AMMONIA [6 records]

Record 1 2021-01-21

English

Subject field(s)
  • Chemistry
  • Water Resources Management
  • Gas Industry
  • Coal-Derived Fuels
CONT

The distillation of coal for the production of gas, coke and the tarry materials used for the manufacture of dyes and organic chemicals results in a watery waste known as ammoniacal gas liquor, and the disposal of this is a cause of pollution. Ammoniacal gas liquor contains free ammonia, ammonium salts, cyanide, sulphide, thiocyanate, and a variety of aromatic compounds including pyridine, phenols, cresols and xylenols.... Gas liquor, discharged untreated to a stream, has an extremely high oxygen demand, many times greater than that of sewage.

French

Domaine(s)
  • Chimie
  • Gestion des ressources en eau
  • Industrie du gaz
  • Combustibles dérivés des charbons

Spanish

Save record 1

Record 2 2011-08-15

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)
C17H35COONH4
formula, see observation
C18H39NO2
formula, see observation
CH3(CH2)16COONH4
formula, see observation
NH4(C17H35COO)
formula, see observation
DEF

A chemical compound in the form of a tan, wax-like solid, free from ammonia odor, soluble in boiling water, used in vanishing creams, brushless shaving creams, other cosmetic products, waterproofing of cements, concrete, stucco, paper and textiles.

OBS

Chemical formula: C17H35COONH4 or C18H39NO2 or CH3(CH2)16COONH4 or NH4(C17H35COO)

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)
C17H35COONH4
formula, see observation
C18H39NO2
formula, see observation
CH3(CH2)16COONH4
formula, see observation
NH4(C17H35COO)
formula, see observation
OBS

Produit chimique se présentant sous la forme d'une pâte ou d'une poudre blanche utilisé comme imperméabilisant pour les ciments, les papiers et les textiles.

OBS

Formule chimique : C17H35COONH4 ou C18H39NO2 ou CH3(CH2)16COONH4 ou NH4(C17H35COO)

Spanish

Campo(s) temático(s)
  • Elementos y compuestos químicos
Entrada(s) universal(es)
C17H35COONH4
formula, see observation
C18H39NO2
formula, see observation
CH3(CH2)16COONH4
formula, see observation
NH4(C17H35COO)
formula, see observation
OBS

Fórmula química: C17H35COONH4 o C18H39NO2 o CH3(CH2)16COONH4 o NH4(C17H35COO)

Save record 2

Record 3 2011-07-05

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)
C11H23COONH4
formula, see observation
DEF

A chemical compound in the form of a tan, wax-like material, free from ammonia odor, used in the production of oil-in-water emulsions with high oil content, and cosmetics.

OBS

Chemical formula: C11H23COONH4

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)
C11H23COONH4
formula, see observation
DEF

Produit à consistance de cire jaune clair utilisé dans l'industrie des cosmétiques et comme émulsionnant pour les émulsions d'huiles dans l'eau.

OBS

Formule chimique : C11H23COONH4

Spanish

Save record 3

Record 4 2007-07-19

English

Subject field(s)
  • Biochemistry
  • Tillage Operations (Agriculture)
DEF

A process by which nitrates or nitrites are reduced with the formation of nitrites nitrogen oxides, ammonia, or free nitrogen and which is commonly brought about(as in the soil or in sewage) by denitrifying bacteria usually resulting in the escape of nitrogen into the air.

CONT

Denitrification takes place under special conditions in both terrestrial and marine ecosystems. In general, it occurs when oxygen ... is depleted, and bacteria turn to nitrate in order to respire organic matter. Because our atmosphere is rich with oxygen, denitrification only takes place in some soils and groundwater, wetlands, poorly ventilated corners of the ocean, and in seafloor sediments.

French

Domaine(s)
  • Biochimie
  • Travaux du sol (Agriculture)
CONT

La dénitrification est un phénomène biochimique qui s'opère en profondeur dans le sol, sous l'action de bactéries spécifiques, satisfaisant leur besoin en oxygène en sol hypoxique ou anoxique, par une désoxygénation des ions nitrates.

OBS

Les nitrates du sol sont transformés en azote gazeux ou en composés volatils, perdus pour les plantes.

Spanish

Save record 4

Record 5 2002-09-11

English

Subject field(s)
  • Chemical Elements and Compounds
  • Biochemistry
CONT

Ammonia solutions are water solutions of ammonia gas. They also include those fertilizer solutions consisting of water solutions of ammonium salts such as ammonium nitrate, which are artificially charged with free ammonia gas.

CONT

One aspect of the unique chemistry of urea places some restrictions on its use as a banded source of nitrogen for potatoes. During the biological conversion of urea-nitrogen to ammonium-nitrogen, free ammonia gas can be evolved in significant quantities near the fertilizer band for short periods of time. Because this also occurs near the seed-piece, this free ammonia gas can cause damage to emerging potato sprouts or root systems.

CONT

Ammonia in water exists in two forms : ammonium ion and free ammonia gas. Above a pH of 10. 7 all ammonia exists as gas.

French

Domaine(s)
  • Éléments et composés chimiques
  • Biochimie
CONT

Y a-t-il possibilité d'accumulation du gaz ammoniac dans l'organisme? [...] L'ammoniac peut être excrété dans l'urine, principalement sous forme d'urée et de sels d'ammonium et, à un degré moindre, sous forme d'ammoniac libre.

CONT

[...] l'hydrolyse de l'urée peut s'arrêter ou ralentir lorsque la quantité d'ammoniac libre (non encore fixée) à l'intérieur de la masse traitée est importante.

CONT

Les doses minimum ne s'appliquent que s'il n'y a pas d'autre source d'azote. Les maxima pour ammonium et urée ne sont pas indépendants puisque l'urée s'hydrolyse en ammonium : c'est l'ammonium total potentiel qui compte, ou plus précisément l'ammoniac libre. Il y a équilibre entre ammoniaque (NH4OH) et ammoniac (NH3) dans l'eau, l'ammoniaque se dissociant elle-même en ions ammonium (NH4) et hydroxyle (OH) : cet équilibre dépend du pH et de la température. L'odeur d'ammoniac est perceptible dès 20 ppm d'ammonium à pH 10 et 20 °C. Plus le pH est haut, plus il y aura d'ammoniac libre [...]

Spanish

Save record 5

Record 6 1998-09-28

English

Subject field(s)
  • Botany
CONT

In exchange for food and a home for the rhizobia in the tumor-like nodules formed on plant roots, the rhizobia aid plant growth by making nitrogen available. The process by which the nitrogen of the air is converted into a usable form available to the plant is called symbiotic nitrogen fixation. Nitrogenase enzymes catalyze the conversion of free nitrogen to ammonia, which is then incorporated into amino acids and proteins.

French

Domaine(s)
  • Botanique
CONT

La mise en évidence des nodosités sur les racines des légumineuses (fut) rapidement suivie de la découverte de la fixation symbiotique de l'azote de l'air [...] Les bactéries existant dans ces nodosités (Bacillus radicola ou Rhizobium) fixent peu d'azote en culture pure mais seulement en milieu symbiotique. [...] Il y a gain d'azote pour la plante et gain pour le sol qui bénéficie de résidus racinaires et d'excrétions éventuelles.

Spanish

Save record 6

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