Arsenic-containing

Marsh s test for arsenic The arsenic-containing specimen is converted to volatile AsHs which is decomposed to a brown stain on heating. Estimation is by comparison of stains. Sb reacts similarly but the Sb stain is not soluble in NaOCl. 

Arsenic present only in traces (in any form) can be detected by reducing it to arsine and then applying tests for the latter. In Marsh s test, dilute sulphuric acid is added dropwise through a thistle funnel to some arsenic-free zinc in a flask hydrogen is evolved and led out of the flask by a horizontal delivery tube. The arsenic-containing compound is then added to the zinc-acid solution, and the delivery tube heated in the middle. If arsenic is present, it is reduced to arsine by the zinc-acid reaction, for example ... 

Trimethyl arsine [593-88-4] C H As, has been identified as the toxic volatile arsenical, once known as "Gosio gas," produced by the reaction of certain molds that grow on wallpaper paste and react with inorganic arsenic compounds present in the paper. A number of microorganisms can methylate arsenic trioxide and other arsenic-containing compounds to yield trimethylarsine. These microorganisms include Scopulariopsis brevicaulis Candida humicola and Gliocladium roseum (72). 

Fire Hazards - Flash Point Not flammable Flammable Limits in Air (%) Not flammable Fire Extinguishing Agents Not pertinent Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Arsenic containing fumes are formed in fires Behavior in Fire Not pertinent Ignition Tenperature Not pertinent Electrical Hazard Not pertinent Burning Rate Not pertinent. 

G. Fritz Advances in Inorg. Chem. 31, 171-214 (1987) N. C. Ngr.man, Polyhedron 12, 2431-46 (1993) and references cited therein. M. Driess, Adx Organomet. Chem. 39. 193-229 (1996) — also deals with sila-arsenes containing Si=As bonds). 

Table 6 shows results obtained on some special primers prepared at Frankford Arsenal containing various pellet wts as specified in the last column. 

Both phenyl radicals and arsenic-containing radicals seem to be involved. Both can be scavenged by oxygen present either in the atmosphere or in the compound itself. 

It is reported that an aluminium cleaner containing low concentrations of hydrofluoric acid can generate stibine from antimony containing bearing-metal alloys, to the permanent detriment of the health of nearby workers. Presumably arsine could appear from arsenic containing alloys both are gases and extremely toxic. 

A case report of acute arsine poisoning in which a 27-y-old man was exposed to arsine during chemical manufacturing was reported by Pinto (1976). The subject was exposed to arsine as a result of arsine production via a reaction between a galvanized bucket and an arsenic-containing sulfuric acid solution. The exposure (duration not specified) produced toxic effects characterized by abdominal cramping, thoracic discomfort, and hematuria. Over the next week, the patient s hematocrit declined from 42.5 to 27.1 and hemoglobin dropped from 14.1 to 9.5 g/dL even with medical intervention (blood transfusions and mannitol diuresis). Nine hours after exposure, blood arsenic was 159 g/dL and urinary arsenic was 1862 ug/L. 

The occupational exposure of five workers to arsine was reported by Phoon et al. (1984). All cases involved hematuria and, except for one patient, abdominal pain and jaundice. One worker was exposed for approximately 1 3/4 h, while the others were exposed for approximately 2 1/4 h. The latency in appearance of toxic effects was unusually short U-3 h). The following day, the arsine level in the workers breathing zone was 0.055 mg/m3 (0.017 ppm), although no processing of arsenic-containing material was taking place at the time of measurement. It was hypothesized by the report authors that the arsine... 

Fruit orchards Inorganic arsenites and arsenates contained up to 17 mg As/kg dry weight in stems, 20 in leaves, and 304 in roots Soils contain 31-94 mg/kg dry weight (vs. 2.4 in untreated 3... 

Charbonneau, S.M., K. Spencer, F. Bryce, and E. Sandi. 1978. Arsenic excretion by monkeys dosed with arsenic-containing fish or with inorganic arsenic. Bull. Environ. Contam. Toxicol. 20 470-477. 

Arseno A process for extracting gold from arsenic-containing ores, developed by Arseno Processing. Similar to the Cashman process. 

V. Dutre and C. Vandecasteele, Solidification/stabilization of arsenic-containing waste leach tests and behaviour of arsenic in the leachate. Waste Manage. 15 1 55-62, 1995. 

Liu, J., Zheng, B., Aposhian, H. V., Zhou, Y., Chen, M. L., Zhang, A. and Waalkes, M. P. (2002). Chronic arsenic poisoning from burning high-arsenic-containing coal in Guizhou, China. Environ Health Perspect, 110(2),... 

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