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MOLIBDEN

molibdenMOLIBDEN (Molybdaenum), Mo, elementi khimiyavii guruhi VI jadvali Mendeleev; raqami at. 42, massai at. 95,94. S. 1778 khimiki shved K. SHeele kashf va s. 1782 digar khimiki shved P. Gelm az MoO3 hosil kardaast.
M. metalli khokistarrangi dushvorgudoz buda, haror. gud. 2620 ± 10°S, haror. jush. qarib 4800°S, zichiash 10200 kg/m3 (20°S) ast. Dar haror. 600°S to MoO3 oksid meshavad; dar 700°S bo bugi ob ba reaksiya rafta, MoO2 hosil mekunad. Dar sharoiti mutadil M. bo ftor va hangomi tafsonidan bo khlor, bughoi sulfur, nitrogen, karbon va dig. nometallho payvast meshavad. M. dar kislotai nitrat, shahsharob, peroksidi gidrogen va dar haror. 80 – 100°S dar kislotahoi gidrogenkhlorid va sulfat nagz hal megardad. Namakhoi kislotahoi soddai M. molibdatho va namakhoi izopolikislotahoi on polimolibdatho nom dorand. M. va khulayu payvasthoi onro dar sanoat az konsentrathoi standartii molibdendor hosil mekunand. Dar rastaniho M. biosintezi kislotahoi nukleat va safedaro metezonad, boisi afzudani khlorofill va vitaminho megardad.
Payvasthoi M. ba organizm tavassuti gizo vorid meshavand. M. dar tarkibi sabzavot, galla, jigar, gurda, kharbuza, doni oftobparast, shir va panir bisyor ast. M.-ro organizm zud hazm mekunad.
M. ba tarkibi fermenthoe, ki dar ravandi hosil gashtani kislotahoi nukleat ishtirok mekunand, dokhil meshavad. Dar organizmi odam M. qismi asosii fermenti ksantinoksidoza meboshad. Ilova bar in, on baroi hosil shudani gemoglobin kumak merasonad, dar ravandi oksid gashtani sulfur ishtirok mekunad, ftorro dar organizm nigoh medorad, kamkhuniro peshgiri menamoyad, khavfi saratoni ruda va medaro kam mekunad. M. ba tarkibi mikroflorai ruda tasir merasonad. Holathoi dar organizm narasidani M. kam duchor meoyand. Bo vujudi in, dar mavridi kostagii on kori dil tez shuda, nafastangi, dilbehuzuri, qay, igmo (koma) rukh medihand, hatto mumkin ast karies va sustkamari ba vuqu payvandad. Miqdori shaboruzii M. baroi kudakon va kalonsolon 75 – 250 mkg ast.
T. Idrisov.

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