Arsenic sulphide

It is recommended that the eompound be fused with a mixture of sodium carbonate (2 parts) and sodium peroxide (1 part) as in the test for Plvoaphoms. Extract the fused mass with water, filter, and acidify with dilute hydrochloric acid. Pass hydrogen sulphide through the hot solution arsenic is precipitated as yellow arsenic sulphide. If antimony is present, it will be precipitated as orange antimony trisulphide. 

Only two papers on CD of an arsenic chalcogenide (arsenic sulphide) were found. Films were obtained using thiosulphate in an EDTA solution of AS2O3 at room temperature and a pH of 2-3 [9]. No compositional information was given. A bandgap of 2.0 eV and a resistivity of O-cm were measured. 

Arsenic(ni) and Arsenic(V) Thiosalts. Filter off the arsenic sulphides obtained and test their solubility separately in ammonium... 

Aerial—or oily—consumed by fire, as sulphur, arsenic, (sulphides of arsenic probably referred to). 

In the noble metals and in many minerals the elements were believed to be so well combined that heat could not separate them. Other minerals, as sulphur, orpiment, asphalt, etc., when heated in the air are partly broken down, the aerial element, not being so firmly united to the earth, being driven off as vapor and mingling with the particles of the atmosphere. This process was interpreted by the Greek alchemists and their Arabian successors as the separation of the spirit from the body, and such substances as were volatilized or burned with formation of gaseous products—as sulphur, arsenic (sulphides), sal ammoniac, quicksilver—were called spirits, while the metals and minerals which, when heated in the air did not volatilize nor disappear in gaseous products, were called bodies (corpora). 

Tin, white like silver, but soft and of bad odor, creaks when bent. It can be burned and the product is not poisonous but useful in medicine. By heating with salt, arsenic (sulphide), markasite and twigs of myrtle it may be changed to silver. 

Arsenic Sulphide. — Dissolve 5 gm. of arsenic trioxidc in a mixture of 5 cc. of. sodium hydroxide solution and 15 cc. of water on adding to the dear solution 2 drops of lead acetate solution, no color reaction should occur. 

Rhipson (Corrupt. rend., 1862, 55, 108) found 11-16 per cent, arsenic sulphide in sulphur from this source. 

When sulphur is heated with arsine, hydrogen sulphide is formed and a sublimate first of arsenic and then of arsenic sulphide is produced.9 The reaction proceeds slowly at 100° C. and at lower temperatures in direct sunlight. Hydrogen sulphide does not react with arsine in the absence of air at the ordinary temperature even in direct sunlight, but on admission of air a deposit of arsenious sulphide is rapidly formed10 whether the reactants are in the gaseous condition or in aqueous... 

The important inorganic toxic compounds to be considered in the following pages are arsine, arsenic trichloride, white arsenic, arsenites and arsenates and arsenic sulphides. Metallic arsenic itself is not poisonous, and the intravenous injection of a colloidal solution of this substance has been found 8 to benefit greatly a case of bone sarcoma of the femur which did not respond to X-ray treatment. 

General—Arsenic Trihydride—Arsenic Trichloride—Arsenious Oxide—Arsenites and Arsenates—Sulphides of Arsenic. 

More rarely use is made for the same purpose of other substances such as strontium and calcium chromates, lead oxychloride (Cassel yellow), lead protoxide, arsenic sulphide (orpiment), stannic sulphide (mosaic gold), potassium cobaltinitrite (cobalt yellow), etc. 

It may contain, as impurities or as additions, other cadmium compounds, zinc compounds and free sulphur, and it may also be adulterated with chrome yellow, cinnabar, arsenic sulphide, heavy spar and gypsum. 

A little of the substance is treated with hot dilute hydrochloric add any insoluble residue remaining may contain especially barium sulphate or free sulphur, and sometimes cinnabar, arsenic sulphide, etc. If the hydrochloric acid solution is coloured, chrome yellow may be present and is easily identified. The solution gives a yellow precipitate with hydrogen sulphide if the filtrate is rendered turbid by addition of ammonia and ammonium sulphide, zinc is present. 

P roblem 3 How will you prepare the colloidal solutions of the following Arsenic sulphide, ferric hydroxide, gold, sulphur, silicic acid, carbon, iodine, mastic. (Meerut 2000)... 

Arsenic sulphide sol A solution of 1. Og As203 in 500 ml of boiling water is obtained. It is cooled and H2S gas is allowed to pass slowly. When... 

Arsenic has long been recognized as a poison, and was reputed to have been used by Agrippina to assassinate the Roman emperor Claudius and by the Roman emperor Nero to kiU Claudius son Britannicus. In the latter case, after the first attempt had failed and had instead aroused suspicion, the arsenic was put into the water used to cool his soup rather than into the soup itself which was tested by a taster. In the seventeenth century a woman by the name of Tofana produced arsenical powders which became known as les poudres de succession , as they were used to remove obstacles like rivals, husbands, and so on. The powders contained arsenic sulphide, aconite, box, caustic lime, powdered glass, and honey. She is reputed to have committed some 600 murders. Her most well-known poison was Aqua Tofana, probably a solution containing arsenic and lead. 

SYNS ARSENIC SESQUISULFIDE ARSENIC SULFIDE YELLOW ARSENIC SULPHIDE ARSENIC TERSULPHIDE ARSENIC TRISULFIDE ARSENIC TRISULFIDE (DOT) ARSENIC YELLOW ARSENIOUS SULPHIDE ARSENOUS SULFIDE AURIPIGMENT C.I. 77085 C.L PIGMENT YELLOW DIARSENIC TRISULFIDE DIARSENIC TRISULPHIDE KING S GOLD KING S YELLOW ORPIMENT... 

Methylarsenious sulphide, CIIjAs S, isolated from the chloride or iodide as noted before, crystallises in glistening plates from alcohol or small columns from carbon disulphide it is insoluble in water, somewhat soluble in alcohol and ether, and very soluble in carbon disulphialcoholic solution precipitato sulphules from solutions of ssdts of silver, copper, mercury, lead, and platinum. 

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