Vim lawv txoj kev ua neej ntev, PCBs tseem siv dav, txawm tias lawv cov khoom siv tau poob qis heev txij li xyoo 1960, thaum muaj teeb meem tshwm sim. … Raws li US Environmental Protection Agency (EPA), PCBs ua rau mob qog noj ntshav hauv cov tsiaj thiab yog tib neeg carcinogens.
PCBs siv rau hnub no yog dab tsi?
Kev lag luam siv rau PCBs
- Transformers thiab capacitor.
- Cov khoom siv hluav taws xob suav nrog cov tswj hluav taws xob, hloov pauv, rov kaw dua, bushings, thiab electromagnets.
- Cov roj siv hauv cov motors thiab hydraulic systems.
- Cov khoom siv hluav taws xob qub lossis cov khoom siv uas muaj PCB capacitors.
- fluorescent teeb ballasts.
- Cable rwb thaiv tsev.
Peb puas tseem siv PCBs?
PCBs tau siv dav hauv cov khoom siv hluav taws xob xws li capacitors thiab transformers. Lawv kuj tau siv hauv cov kua dej hydraulic, cov kua dej hloov hluav taws xob, cov roj nplua nyeem, thiab cov yas yas. … Xyoo 1979, US Environmental Protection Agency (USEPA) txwv tsis pub siv PCBs; Txawm li cas los xij, PCBs tseem muaj nyob hauv ntau cov khoom ua ntej xyoo 1979
Vim li cas PCBs tseem muaj teeb meem?
Txawm tias tsis siv, PCBs, lossis polychlorinated biphenyls, tseem muaj nyob hauv ib puag ncig niaj hnub no vim lawv tsis tawg sai sai Lub sijhawm uas nws siv tshuaj xws li PCBs kom tawg ib txwm nyob ntawm lawv qhov loj me, qauv, thiab tshuaj muaj pes tsawg leeg.
PCBs nyob hauv ib puag ncig ntev npaum li cas?
Lub sijhawm nws siv rau ib nrab ntawm cov PCBs (thaum pib) tam sim no kom tawg yog li ntawm 3.5 txog 83 hnub rau cov molecules nrog 1 txog 5 chlorine atoms. Hauv dej, PCBs yog qhov tseem ceeb tawg los ntawm lub hnub ci (photolysis).
