Copper arsenical

Arsenical copper alloys were widely used in antiquity, and arsenical copper finds have been reported in such places, among others, as the Dead Sea area in Israel, the Cyclades Islands in the Aegean Sea, and South America (Renfrew 1967 Lechtman and Klein 1999). The compositions of some arsenical coppers are listed in Table 47. 

Origin Sampie Copper Arsenic Antimony Silver Lead Reference 

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Phosphorized deoxidized arsenical copper (alloy 142 (23)) is used for heat exchangers and condenser tubes. Copper-arsenical leaded Muntz metal (alloy 366), Admiralty brass (alloy 443), naval brass (alloy 465), and aluminum brass (alloy 687), all find use in condensers, evaporators, ferrules, and heat exchanger and distillation tubes. The composition of these alloys is Hsted in Table 5. 

Relatively soon after ancient humans recognized the metals and their special properties, they also discovered ways to make alloys. Some alloys were produced in antiquity directly, by the smelting of ores that include two metals in their composition or mixtures of ores of different metals. Arsenical copper, bronze, and brass, for example, three alloys of copper... 

Mixing molten copper with other metals yields a variety of alloys, such as bronze when alloyed with tin, brass with zinc, and arsenical copper with arsenic (see Table 34 and text below). All these alloys have extremely good mechanical and working properties and have, therefore, been employed for applications requiring strength and hardness (West 1982). 

It seems that making arsenical copper was characteristic of a transitional stage of technological development, the alloy apparently first replacing pure copper and then eventually being supplanted by bronze. It is possible that during the early Bronze Age it was realized that the use of arsenic-rich copper ores, or the incorporation of arsenic ores into copper ores smelting... 

Budd, P. and B. Ottaway (1991), The Properties of Arsenical Copper Alloys Implications for the Development of a Neolithic Metallurgy, Oxbow Monograph 9, Oxford. 

Braman et al. [34] used sodium borohydride to reduce arsenic and antimony in their trivalent and pentavalent states to the corresponding hydrides. Total arsenic and antimony are then measured by their spectral emissions, respectively, at 228.8 nm and 242.5 nm. Limits of detection are 0.5 ng for antimony and 1 ng for arsenic, copper, and silver. Oxidants interfere in this procedure. 

Fig. 31.5. Minerals formed during reaction at 25 °C of a hypothetical acid drainage water with calcite (top), and fractions of the amounts of arsenite, arsenate, copper, lead, and zinc present initially in solution that sorb onto ferric hydroxide over the course of the reaction path (bottom). Bottom figure is plotted against pH, which increases as the water reacts with calcite.

Lead arsenate Copper acetoarsenite CALIFORNIA QUAIL, Callipepla californica Sodium arsenite COMMON BOBWHITE, Colinus virginianus Copper acetoarsenite Sodium cacodylate... 

Arsenical copper alloys, 3 271-272, 272 Arsenical herbicides, 13 325 Arsenical insecticides, 14 339 Arsenic alloys, 3 271-272 Arsenical pesticides, 13 298 Arsenic analysis, of water, 26 40-41 Arsenic carbide (2 6), 4 649t Arsenic-catalyzed liquid-phase process, 10 655... 

Pollard, A.M., Thomas, R.G. and Williams, P.A. (1990). Experimental smelting of arsenical copper ores implications for Early Bronze Age copper production. In Early Mining in the British Isles, ed. Crew S. and Crew P., Occasional Paper No. 1, Plas Tan y Bwlch, Snowdonia National Park Study Centre, Gwynedd, pp. 72-74. 

Intimate mixtures of chlorates, bromates or iodates of barium, cadmium, calcium, magnesium, potassium, sodium or zinc, with finely divided aluminium, arsenic, copper carbon, phosphorus, sulfur hydrides of alkali- and alkaline earth-metals sulfides of antimony, arsenic, copper or tin metal cyanides, thiocyanates or impure manganese dioxide may react violently or explosively, either spontaneously (especially in presence of moisture) or on initiation by heat, friction, impact, sparks or addition of sulfuric acid [1], Mixtures of sodium or potassium chlorate with sulfur or phosphorus are rated as being exceptionally dangerous on frictional initiation. 

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