Selenium
Khoom Paub meej
Specifications muab
Cov hmoov dub
Cov ntsiab lus ≥ 99%
(Scope ntawm daim ntawv thov siv 'cov khoom siv')
Selenium muaj plaub yam allomorphs: grey hexagonal metallic selenium, me ntsis xiav, nrog ib tug txheeb ze ntom ntawm 4.81g / cm³ (20 ℃ thiab 405.2kPa), melting point ntawm 220.5 ℃, boiling point ntawm 685 ℃, insoluble nyob rau hauv dej, carbon disulfide thiab ethanol soluble nyob rau hauv sulfuric acid thiab chloroform;Liab monoclinic siv lead ua selenium, tus txheeb ze ntom yog 4.39g / cm³, melting point 221 ℃, boiling point 685 ℃, insoluble nyob rau hauv dej, ethanol, me ntsis soluble nyob rau hauv ether, soluble nyob rau hauv sulfuric acid thiab nitric acid;Cov txheeb ze ntom ntom ntawm liab amorphous selenium yog 4.26g / cm³, thiab cov txheeb ze ntom ntom ntawm cov iav dub selenium yog 4.28g / cm³.Nws yog hloov dua siab tshiab rau hauv hexagonal selenium ntawm 180 ℃, thiab lub boiling point yog 685 ℃.Nws yog insoluble hauv dej thiab me ntsis soluble hauv carbon disulfide.
EVERBRIGHT® ' kuj tseem yuav muab customized ： cov ntsiab lus / whiteness / particlesize / PHvalue / xim / ntim style / ntim specifications thiab lwm yam khoom tshwj xeeb uas tsim nyog rau koj cov kev siv, thiab muab cov qauv dawb.
Khoom Parameter
7782-49-2 ib
231-957-4 ib
78.96 ib
Cov khoom tsis yog xim hlau
4.81 g / cm³
Insoluble hauv dej
685 ib℃
220.5 ° C
Khoom siv
Kev siv tshuab
Selenium muaj ob qho tib si photoelectric thiab photosensitive zog.Photoelectric kev ua tau zoo tuaj yeem hloov lub teeb ncaj qha rau hauv hluav taws xob, thiab kev ua haujlwm photosensitive tuaj yeem txo qhov tsis kam thaum nce lub teeb.Lub photoelectric thiab photosensitive zog ntawm selenium yuav siv tau nyob rau hauv zus tau tej cov photocells thiab raug meters rau lub koob yees duab thiab lub hnub ci hlwb.Selenium tuaj yeem hloov pauv tam sim no mus rau qhov tam sim no ncaj qha, yog li nws tau siv dav hauv kev tsim cov rectifiers.Selenium elemental yog P-hom semiconductor uas tuaj yeem siv rau hauv circuits thiab cov khoom siv hauv lub xeev.Hauv kev luam ntawv, selenium tuaj yeem siv los luam cov ntaub ntawv thiab cov ntawv (toner cartridges).Hauv kev lag luam iav, selenium tuaj yeem siv los tsim cov iav decolorized, ruby xim iav thiab enamel.
Qib Meidical
Txhawb kev tiv thaiv
Cog active selenium tuaj yeem tshem tawm cov dawb radicals hauv lub cev, tshem tawm cov co toxins hauv lub cev, antioxidant, tuaj yeem tiv thaiv kev tsim cov lipid peroxide, tiv thaiv cov ntshav txhaws, tshem tawm cov roj cholesterol, thiab txhim kho tib neeg lub cev tiv thaiv kab mob.
Tiv thaiv ntshav qab zib
Selenium yog lub luag haujlwm tseem ceeb ntawm glutathione peroxidase, uas tuaj yeem tiv thaiv oxidative kev puas tsuaj ntawm islet beta hlwb, ua rau lawv ua haujlwm ib txwm, txhawb cov metabolism hauv qab zib, txo cov ntshav qab zib thiab tso zis qab zib, thiab txhim kho cov tsos mob ntawm cov neeg mob ntshav qab zib.
Tiv thaiv kab mob cataract
Lub retina yog qhov yooj yim rau kev puas tsuaj vim raug hluav taws xob ntau hauv computer, selenium tuaj yeem tiv thaiv retina, txhim kho qhov ua tiav ntawm lub cev vitreous, txhim kho qhov muag, thiab tiv thaiv kab mob cataracts.
