Sometimes referred to in short as inorganic arsenic, inorganic
arsenic compound contain arsenic (As) and at least one other element,
but no carbon (C). Inorganic arsenic exists in four main chemical forms
known as valency or oxidation states. Valency is a measure of the
ability of a compound to combine with other elements, such as hydrogen.
The dominant forms are:
- Arsenite, with a valency of 3, also referred to as trivalent
arsenic (As (III), As+3), and
- Arsenate, with a valency of 5, also referred to as pentavalent
arsenic (As (V), As+5
Inorganic arsenic (compounds) are mainly of geological origin and can be found
in groundwater used as drinking water in certain parts of the world.