Chemistry

Detection of arsenic

Detection of arsenic



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Detection of arsenic

Arsenic - worth knowing

Systematics:
Arsenic is in group 15 (V main group) of the periodic table and often occurs in the oxidation states + III and + V, more rarely also in the oxidation state III.
Occurrence / synthesis:
In nature, arsenic is mostly found as a component of iron and nickel ores, e.g. as arsenic gravel (arsenopyrite, FeAsS) and arsenic nickel gravel (NiAsS).
Characteristics:
Several modifications of arsenic are known, of which the gray (metallic arsenic) is the most stable. When heated, arsenic burns in the air with a blue flame to form white arsenic (III) oxide (arsenic, As2O3), which is found in small quantities in water with the formation of amphoteric arsenic acid (H.3AsO3) solves. Arsenic is produced in large quantities during the roasting of ores (especially in copper production).
Use:
Arsenic compounds are used in the semiconductor industry and in glass manufacturing. All arsenic compounds are highly toxic, As2O3 is also carcinogenic. Excursus: Toxicity of metals: arsenic


Video: Arsenic Detection (August 2022).