The present paper describes the hydrogen reduction of synthetic pentlandite and pentlandite concentrate in the presence and the absence of added calcium hydroxide. Cheap Nike Air Max 270 Synthetic pentlandite was prepared by heating a stoichiometric mixture of an iron-nickel alloy and sulfur for about 10 days at 473 to 723 K. Differential thermal analysis (DTA) apparatus was used to study the thermal decomposition of the synthetic pentlandite. http://www.nikehuarachenz.nu Hydrogen reduction of synthetic pentlandite in the presence and the absence of added Ca(OH) 2 was studied at 673 to 1023 K in a thermogravimetric apparatus. Additions of Ca(OH) 2 to penlandite accelerated the reduction rates. An acetic acid leach of a product obtained by H 2 reduction of a mixture of pentlandite and Ca(OH) 2 yielded a leach residue containing mainly an… iron-nickel alloy. Nike Huarache Nz The iron and nickel content in the leach residue averaged about 44 pct iron and 52 pct nickel with recoveries of about 82 pct iron and 94 pct nickel.
Human exposure to potentially neurotoxic methylmercury species is a public-health concern for many populations worldwide. Cheap Nike Air Max Nz Both fish and whale are known to contain varying amounts of methylmercury species. However studies of populations that consume large quantities of fish or whale have provided no clear consensus as to the extent of the risk. The toxicological profile of an element depends strongly on its chemical form. We have used X-ray absorption spectroscopy to investigate the comparative chemical forms of mercury and selenium in fish and whale skeletal muscle. The predominant chemical form of mercury in whale is found to closely resemble that found in fish. In the samples of skeletal muscle studied, http://www.nikehuarachenz.nu no involvement of selenium in coordination of mercury is indicated in either whale… or fish, with no significant inorganic HgSe or HgS type phases being detected. The selenium speciation in fish and whale shows that similar chemical types are present in each, but in significantly different proportions. Cheap Nike Air Max Plus Our results suggest that for equal amounts of Hg in skeletal muscle, the direct detrimental effects arising from the mercury content from consuming skeletal muscle from whale and fish should be similar if the effects of interactions with other components in the meat are not considered.
‘Metahistorical romance’ is postmodernist historical fiction which is obsessed with historiographical questions in a self-reflexive mode. Cheap Nike Air Max 90 Nz This fiction both continues and reverses the dominant of the historical romance genre associated with the work of Scott. It also rehearses many of the perspectives on history found in postmodern historiography. The central characteristic of metahistorical romance is pursuit of the historical sublime, http://www.nikehuarachenz.nu which it confronts as repetition and deferral. After generally illustrating correspondences between this postmodern genre and postmodern historiographical perspectives, the article investigates correspondences between sublime history and dialogical history and explores ways in which the metahistorical romance may be said to construct history as dialogical…. Dialogical history, Nike Air Max Nz while impossible in a literal sense, may still offer useful alternatives to dialectical models of history and radical postmodernist scepticism.