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GENERAL CHEMIST [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2016-02-29

English

Subject field(s)
  • Chemical Engineering
  • Anti-pollution Measures
  • Water Pollution
  • Solvents and Petroleum Spirits
CONT

Oil slick dispersants. When oil ... is treated with a suitable surface active agent and agitation applied, the oil is broken up into particles ... so small that they constitute an oil-in-water emulsion ... Dispersants serve to increase the surface area of an oil spill and disperse oil globules throughout the layer volume water. This causes an accelerated degradation of oil by microbiological action.

OBS

The chemicals used to disperse the oil are emulsifiers. Although a chemist would never confuse the terms dispersant and emulsifier, the former designating a product which encourages the distribution of finely divided solids in a fluid, either liquid or gas, the latter referring to a product which encourages the colloidal dispersion of one liquid in another, the terms are synonymous in the field of oil pollution control. This is explained by the following sentence taken from "The Control of oil pollution on the sea and inland waters", edited by J. Wardley-Smith(source COCOB) :"It was found... [that the product] when sprayed on to the oil, effectively softened and dispersed it by means of emulsification... "The dispersion is accomplished by products which emulsify the oil, i. e., emulsifiers. Dispersion is used in its general sense and hence dispersant simply means a product that causes spreading. Also dispersant is used more frequently than emulsifier.

French

Domaine(s)
  • Génie chimique
  • Mesures antipollution
  • Pollution de l'eau
  • Solvants et essences spéciales (Pétrole)
DEF

Produit contenant des solvants et des tensioactifs qui, répandu sur une nappe de pétrole en mer, provoque le fractionnement de celle-ci en gouttelettes et facilite sa dispersion.

CONT

Produits émulsifiants ou dispersants. Ces produits [...] sont pratiquement tous des produits chimiques. Leur action [...] consiste à répartir une pollution de surface dans le volume de la mer, sous forme de fines particules. L'on espère, par ce procédé, favoriser l'action des bactéries et accélérer la biodégradation naturelle des hydrocarbures.

Key term(s)
  • agent de dispersion

Spanish

Campo(s) temático(s)
  • Ingenieria química
  • Medidas contra la contaminación
  • Contaminación del agua
  • Solventes y bencinas especiales (Petróleo)
DEF

Agente tensioactivo adicionado a un medio en suspensión para originar la separación uniforme de partículas sólidas muy finas.

Save record 1

Record 2 1991-12-20

English

Subject field(s)
  • Pollutants
CONT

Chemist, Organic Residues. Under general supervision in a regional pesticide laboratory, provides data in analyzing samples of food for trace residues of pesticides and environmental contaminants to aid in the enforcement or establishment of regulations and provisions of the Food and Drugs Act....

CONT

Using moving air, general ventilation dilutes and removes environmental contaminants away from where they can do damage.

French

Domaine(s)
  • Agents de pollution
OBS

contaminant : (...) substance dont la présence, généralement en quantité très faible, rend dangereuse la consommation d'un produit ou altère la qualité de l'environnement.

OBS

contaminants présents dans le milieu ambiant. Cette expression nous paraît un peu redondante.

OBS

"Contaminant" implique la présence de germes pathogènes ou de substances toxiques, et doit donc être utilisé lorsqu'il est question de l'altération possible de la santé, alors que "polluant" désigne plus la présence indésirable d'une substance dans l'environnement au sens large.

Spanish

Save record 2

Record 3 1989-08-08

English

Subject field(s)
  • Pollutants
  • Water Pollution
CONT

Chemist, Organic Residues.... Under general supervision in a regional pesticide laboratory, provides data in analyzing samples of food for trace residues of pesticides and environmental contaminants to aid in the enforcement or establishment of regulations and provisions of the Food and Drugs Act....

French

Domaine(s)
  • Agents de pollution
  • Pollution de l'eau
CONT

Les publications concernant les méthodes d'analyse de résidus de pesticides dans les eaux sont relativement récentes.

Spanish

Save record 3

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