Habitat

Set of environmental conditions in which a biocenosis, a species or an individual lives.

Hydrocarbon (HC)

Hydrocarbons in petroleum are major pollutants of many different organic compounds. There may be soluble and insoluble, degradable and persistent, etc.

Herbicide

Chemical substance that prevents the growth of harmful herbs that grow in a field.

Sulfur hexafluoride (SF6)

It is one of the six greenhouse gases that are being reduced under the Kyoto Protocol. They are widely used in heavy industry for the insulation of high voltage equipment and as an aid in the manufacture of cable cooling systems.

Chlorinated Hydrocarbons

Volatile and / or polycyclic hydrocarbons provided with chlorine atoms. Several groups are distinguished: aliphatic chlorides, aromatic chlorinates, polycyclic chlorides (PCBs).

Hydrofluorocarbons (HFCs)

One of the six greenhouse gases that are being eliminated under the Kyoto Protocol. They are produced commercially as substitutes for chlorofluorocarbons. HFCs are used primarily in refrigeration and semiconductor manufacturing.

Hydrolysis

Chemical reaction between water and another substance, such as salts. When dissolved in water, their constituent ions combine with hydronium or oxonium ions, H3O + or with hydroxyl ions, OH-, or both (it can be said that water reacts "breaking the compound"). These ions come from the dissociation or self-protolysis of water. This produces a displacement of the balance of dissociation of the water and as a consequence the pH value is modified.

Homeostasis

Property of living organisms that consists of their ability to maintain a stable internal condition, compensating for changes in their environment through the regulated exchange of matter and energy with the outside (metabolism).