Cov ntaub ntawv ntau tshaj plaws ntawm crystalline silica yog quartz, uas muaj nyob rau hauv xuab zeb, gravel, av nplaum, granite, diatomaceous ntiaj teb, thiab ntau lwm hom pob zeb. Non-crystalline silica muaj nyob rau hauv iav, silicon carbide, thiab silicone. Cov ntaub ntawv no tsis tshua muaj kev phom sij rau lub ntsws.
Lub ntsiab ntawm silica yog dab tsi?
Kuj hu ua silica xuab zeb lossis quartz xuab zeb, silica yog ua los ntawm silicon dioxide (SiO2). Silicon tebchaw yog qhov tseem ceeb tshaj plaws ntawm lub ntiaj teb crust. Txij li cov xuab zeb yog plentiful, yooj yim rau kuv thiab kuj yooj yim rau txheej txheem, nws yog thawj qhov chaw ntawm silicon. Lub pob zeb metamorphic, quartzite, yog lwm qhov chaw.
silica tsim tau li cas?
Nws yog tsim thaum silicon raug oxygen. Nws muaj covalent daim ntawv cog lus thiab yog lub zog hluav taws xob zoo tshaj plaws, muaj tshuaj lom neeg ruaj khov. Quartz yog qhov thib ob feem ntau cov ntxhia hauv ntiaj teb sab av loj.
silica nyob qhov twg?
Ib qho khoom siv ntuj tsim ntau, crystalline silica muaj nyob hauv pob zeb, av, thiab xuab zeb. Nws tseem muaj nyob rau hauv pob zeb, cib, mortar, thiab lwm yam khoom siv. Crystalline silica tuaj nyob rau hauv ntau hom, nrog quartz yog feem ntau.
Puas silica muaj teeb meem rau tib neeg?
Ua pa me me ("ua pa") crystalline silica hais, ua rau ntau yam kab mob, suav nrog silicosis, kab mob ntsws uas kho tsis tauua rau muaj kev tsis taus thiab tuag. Respirable crystalline silica kuj ua rau mob ntsws cancer, mob ntsws obstructive pulmonary (COPD), thiab kab mob raum.
