Arsenic monosulfide

Arsenic is the 53rd most abundant element and is widely distributed in the Earths crust. It occurs naturally in several minerals, but high-grade deposits are rare. Most of the minerals and ores that contain arsenic also contain other metals. Some major sources of arsenic are the minerals orpiment, scherbenkobalt, arsenopyrite, niccohte, realgar, gersdorffite, and smaltite. In addition, most sulfide ores of other metals also contain some arsenic. The three major minerals that produce arsenic are realgar (arsenic monosulfide, AsS), orpiment (arsenic trisidfide, ASjSj), and arsenopyrite (iron arsenosulfide, FeAsS). 

Synonyms arsenic disulfide arsenic monosulfide red arsenic sulfide ruby arsenic realgar red orpiment. 

Arsenic trioxide dissolves in concentrated H2SO4 forming arsenyl sulfate, (As02)2S04, a hygroscopic crystalline sohd. Reaction with sulfur trioxide, SO3 at 100°C produces arsenic trisulfate, As2(S04)3. It forms arsenic monosulfide, AS4S4 when heated with sulfur. 

Arsenic disulfide Arsenic monosulfide /Irsenic orange Arsenic sulfide (AS2S2) Arsenic Sulfide Red Arsino, thioxo- C.l. 77085 Caswell No. 058 EPA Pesticide Chemical Code 006901 Red algar Red arsenic Red arsenic glass Ruby arsenic Red orpiment Ruby sulfur Throxoarsino. Red pigment us in the leather industry, paint, pyrotechnics, and taxidermy. Red solid mp = 320 bp = 565 insoluble in H2O. Atomergic Chemetals. 

Mixtures of potassium nitrate with antimony trisulfide [1], barium sulfide, calcium sulfide, germanium monosulfide or titanium disulfide all explode on heating [2]. The mixture with arsenic disulfide is detonable, and addition of sulfur gives a pyrotechnic composition [2], Mixtures with molybdenum disulfide are also detonable [3], Interaction with sulfides in molten mixtures is violent [4],... 

Metal Sulfides. Mixtures with antimony trisulfide, barium or calcium sulfides, or germanium monosulfide or titanium disulfide explode on heating4-6 mixtures with arsenic disulfide6 or molybdenum disulfide7 are detonatable. 

There are two interesting paradoxes concerning selenium. The first is that excess selenium is toxic however, at lower levels it is a protective agent against the toxicity of cadmium, methylmercury, arsenic, copper, and thalium. The second paradox involves carcinogenicity. The US National Cancer Institute found selenium monosulfide (administered orally) to be carcinogenic in rodents however, many epidemiological studies associate selenium intake with lower cancer rates in humans. Moreover, in... 

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