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A term referring to the general environment.


The toxic effects on environmental organisms other than humans.


Effective dose 50%. The estimated dose that causes some specific effect (usually desirable) for 50% of the population.


The retention of fluid in an organ or in the body.


The discharge of waste from a plant or other source into the environment.

Environmental Fate

The fate of a substance following its release into the environment. It includes the movement and persistence of the substance.


A protein which serves as a catalyst for chemical reactions in cells.

Enzyme Inhibitor

A substance which causes a decrease in levels of an enzyme.


The study of the relative characteristics of exposed and nonexposed human populations for the purpose of detecting harmful effects.


The outer layer of the skin.


A process whereby substances (or metabolites) are eliminated from the body.


Contact with a foreign substance, usually by inhalation, ingestion, or skin contact.

Exposure Assessment

The analysis or estimation of the intensity, frequency, and duration of human exposures to an agent.

Exposure Dose

The amount of a substance in the environment to which a person is subjected.

EC No.

Is a seven-digit number (xxx-xxx-x) assigned by the European Commission to chemicals contained in three inventories:
EINECS is the European Inventory of Existing Commercial Substances and its EINECS numbers are displayed as 2xx-xxx-x.
ELINCS is the European List of Notified Chemical Substances that was available after September 18, 1981 and its ELINCS numbers are displayed as 4xx-xxx-x.
NLP is the No-Longer Polymers category and its NLP numbers are displayed as 5xx-xxx-x

EC Number

The EC Number, formerly known as the EINECS number is a unique 7-digit number (format: xxx-xxx-x) assigned to chemicals registered with the European Chemicals Agency (ECHA).


The European Chemicals Agency (ECHA) was set up to manage and carry out technical, scientific and administrative aspects of REACH, the EU's groundbreaking chemicals legislation, for the benefit of human health and the environment. ECHA helps companies to comply with the legislation, advances the safe use of chemicals in consumer products, provides information on chemicals and addresses chemicals of concern.