arsenic

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arsenic

 (As) [ahr´sĕ-nik]
a chemical element, atomic number 33, atomic weight 74.92. (See Appendix 6.) It is toxic by inhalation or ingestion, and carcinogenic (see arsenic poisoning). In nature it occurs usually as one of its salts; in human environments it is often a pollutant in mining regions, and is used in dyes, household pesticides, and compounds used in agriculture. Arsenic compounds called arsenicals were formerly widely used in medicine.
arsenic poisoning poisoning due to systemic exposure to inorganic pentavalent arsenic. Arsenic is cumulative, storing permanently in hair, nails, and bone, and children are particularly susceptible. Arsenic is odorless and flavorless and has been found in elevated levels in the drinking water that flows through arsenic-rich rocks, leading to serious health problems in some countries. The antidote for arsenic poisoning is dimercaprol. Acute arsenic poisoning, which may result in shock and death, is marked by skin eruptions, swelling of eyelids and limbs, vomiting, diarrhea, and cramps. Chronic arsenic poisoning (called also arsenism), due to ingestion of small amounts over a long period of time, is marked by skin pigmentation with scaling, keratosis of the palms and soles, white lines on the fingernails, peripheral neuropathy, and confusion.
arsenic trioxide an oxidized form of arsenic, used in weed killers and rodenticides. It is also administered intravenously as an antineoplastic in the treatment of acute promyelocytic leukemia.

ar·se·nic (As),

(ar'sĕ-nik),
1. A metallic element, atomic no. 33, atomic wt. 74.92159; forms a number of poisonous compounds, some of which are used in medicine.
2. Denoting the element arsenic or one of its compounds, especially arsenic acid.
Synonym(s): arsenium, ratsbane
[L. arsenicum, G. arsenikon, fr. Pers. zarnik]

arsenic

A metallic element (atomic number 33, atomic weight 74.92) which has been linked to deficiency states in some plants and animals. It has no known physiologic role in humans, and is extremely toxic in more than trace amounts.
Reference range Hair/nails <1.0 µg/g; urine <50 µg/24 hours. Excretion in occupationally exposed individuals ranges from 50 to 5000 µg/24 hours.

ar·se·nic

(As) (ahr'sĕ-nik)
A metallic element, atomic no. 33, atomic wt. 74.92159; forms a number of poisonous compounds, some of which are used in medicine.
[L. arsenicum, G. arsenikon, fr. Pers. zarnik]

arsenic

A metallic element some of whose compounds are violently poisonous. Formerly widely used in insecticides and weed killers and in various industrial processes.

arsenic

a chemical element in the form of a grey metal, more familiar in the extremely poisonous form of arsenious trioxide. It was at one time used in arsenical soap for the preservation of animal and bird skins in museums, so that particular care should be taken in handling old museum skins.