Platinum metals

Platinum metals are chemical elements VIII group of the periodic system of elements of D. I. Mendeleyev: ruthenium (ruthenium) EN, rhodium (rhodium) Rh, palladium (palladium) Pd, osmium (osmium) Os, iridium (iridium) Ir, platinum (platinum) Pt. P. M. belong to multiple elements, are found mainly in the native state. Refractory, volatile ingredients (Pt and Pd malleable), silver-grey metal Basic properties shown in the table.
Platinum metals have the ability to absorb hydrogen and other gases. Under normal conditions platinum metals do not interact with acids, oxygen, Halogens, sulfur and other Exception is the OS that is on the air oxidized to OsO4 ("osmaeva acid" - volatile crystalline substance with a sickening smell, strong oxidizer). When fused with alkalis in the presence of oxidants rhodium and iridium form hydroxide, and ruthenium and osmium - ruthenate and Almaty (salt ruthenium and omaboy acids). P. M. easily form complex compounds; for example, the action on the platinum "Tsarskaya vodka" is latinobarymetro acid H2(PtCl6)·6H2o Platinum metals and their alloys used for manufacturing of special instruments, laboratory ware, electrodes, thermocouples, surgical instruments, dental technology, as catalysts in chemical processes, etc. P. m is not poisonous, but many of the compounds of platinum and osmium toxic. So, H2(PtCl6) and its salts, being in the form of dust in the air, cause platanos (disease of the respiratory tract and allergic skin. Especially poisonous cheiragonus OsO4; in case of poisoning her pairs observed lesions of the respiratory organs, eyes, indigestion, changes in the kidneys, are formed on the skin for a long time non-healing ulcers. The treatment is symptomatic. Prevention - observance of safety rules (ventilation and others) in the corresponding production.