Phosphorus-arsenic

Many shell-and-tube condensers use copper alloy tubes, such as admiralty brasses (those containing small concentrations of arsenic, phosphorus, or antimony are called inhibited grades), aluminum brasses, and cupronickel austenitic stainless steel and titanium are also often used. Utility surface condensers have used and continue to use these alloys routinely. Titanium is gaining wider acceptance for use in sea water and severe service environments but often is rejected based on perceived economic disadvantages. 

Toxic inorganic substances e.g. Lead, manganese, cadmium, antimony, beryllium, mercury arsenic phosphorus selenium and sulphur compounds, fluorides. 

Figure 5.10. EPMA maps for nickel, arsenic, phosphorus and silicon in a 1st century AD Roman mattock blade. Scale bar = 1 mm. (Courtesy Dr C.J. Salter, Oxford University.)...

Arsenic, phosphorus, DDT, benzene hexachloride, chlordan, toxaphene, carbon tetrachloride, DD, ethylene chlorohydrin... 

Arsenic, phosphorus, fluorides, petroleum oils, calcium oxide and hydroxide, phenols... 

Patty FA Arsenic, phosphorus, selenium, sulfur, and tellurium. In Patty FA (eds) IndmtrialHygiene and Toxicology, 2nd ed, Vol 2, Toxicology, p 885. New York, Wiley-Interscience, 1963... 

Explosion Hazard The volatile hydrides (such as hydrides of boron, arsenic, phosphorus, selenium, tellurium) form explosive mixtures with air. 

Compare the properties of antimony hydride with those of similar compounds of arsenic, phosphorus, and nitrogen (the thermal stability, reducing properties, etc.). 

B) Corner, M. Rapid Micro-Determination of Organically Bound Halogens, Arsenic, Phosphorus and Boron. Analyst 84, 41 (1959). 

McCarthy and coworkers (74) at the Australian Forest Products Laboratory reported that a pressure treatment for pine posts with zinc-copper-chromium-arsenic-phosphorus preservative produced a leach-resistant treatment having both fire retardancy and preservation against decay. This treatment system is reported to have commercial application in Australia. 

The reaction of bis(/3- mercaptoethyl)phosphane with tris(dimethylamino)-phosphane or -arsane leads to stable fused heterocycles containing phosphorus-phosphorus and arsene-phosphorus linkages (equation 76) (82TL1345). 

Since the crude materials employed often contain arsenic, phosphorus, sulphur, and carbon, such impurities as arsine, phosphine, hydrogen sulphide, and hydrocarbons are frequently present in the hydrogen evolved. Morley5 found that zinc occludes carbon dioxide, which contaminates the hydrogen. If the sulphuric acid employed is too concentrated, the hydrogen contains hydrogen sulphide and sulphur dioxide, formed by partial reduction of the acid by the nascent gas ... 

Explodes on contact with acetic acid, acetic anhydride, ammonium nitrate, dimethylformamide, formaldehyde, concentrated hydrochloric acid, potassium chloride + sulfuric acid, sulfuric acid + water. Forms sensitive explosive mixtures with aluminum powder + ammonium nitrate + glyceryl nitrate + nitrocellulose, ammonium perchlorate, arsenic, phosphorus, sulfur, slag wool, titanium. 

Belcher and collaborators described a method for arsenic in which the sample (30-60 mg) is burnt by a modified oxygen fiask procedure and arsenic is determined by the precipitation as quinoline molybdoarsenate, which is then reduced with hydrazine sulphate and determined spectrophotometrically at 840 nm. The absolute accuracy is within + 1% for arsenic. Phosphorus interferes in this procedure. 

G. Preparation of Organoarsenic(lll) Compounds Containing Arsenic-Phosphorus, -Antimony or -Bismuth Bonds... 

Hudgens and Cali 38) have described a determination of antimony at the parts per million level in zirconium oxide. Distillation and solvent extraction were used in the radiochemical purification and antimony was mounted, prior to counting, by electrolysis onto platinum foil. Atchison and Beamer (S) have determined arsenic, phosphorus, copper, sodium, strontium, calcium, and chromium in pure magnesium. 

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