PCB zafunyanwa ngenkulungwane ye-19. Ngelo xesha, iinqwelo-mafutha zazisetyenziswa ngokubanzi kwaye imfuno yepetroli yayisanda. Ipetroli icocwa kwioyile ekrwada, kwaye izixa ezikhulu zeekhemikhali, njengebenzene, ziyakhutshwa kwinkqubo. Xa i-benzene ishushu, i-chlorine yongezwa ukuvelisa ikhemikhali entsha ebizwa ngokuba yi-Polychlorinated biphenyls (PCB). Ukuza kuthi ga ngoku, kukho izinto ezinxulumeneyo ezingama-209 kwi-PCB, zibalwe ngokwenani leeyoni zeklorini eziziquletheyo nalapho zifakwe khona.

Ubume kunye nokuSetyenziswa

I-PCB yikhemikhali yoshishino eneempawu ezilandelayo:

1. Ukuhanjiswa kobushushu kunamandla, kodwa akukho kuhanjiswa kombane.

2. Akukho lula ukutshisa.

3. Ipropati ezinzileyo, akukho tshintsho lweekhemikhali.

4. Ayinyibiliki emanzini, yinto enyibilikayo etyebileyo.

Ngenxa yezi zakhiwo, i-PCB ekuqaleni yayijongwa njenge-godsend yi-industry kwaye yayisetyenziswa ngokubanzi njenge-dielectric, kwizixhobo zombane ezifana ne-capacitors kunye ne-transformers, okanye njengolwelo lokutshintsha ubushushu ukulawula ubushushu apho izixhobo zisebenza khona.

Kwiintsuku zokuqala, abantu bebengazi ngobutyhefu be-PCBS kwaye khange bathathe manyathelo okhuseleko, kwaye balahla isixa esikhulu senkunkuma ye-PCB elwandle. Kwakungekho de abasebenzi abavelisa i-PCB baqala ukugula kwaye izazinzulu zokusingqongileyo zifumene umxholo we-PCB kwizinto eziphilayo zaseLwandle apho abantu baqala ukunikela ingqalelo kwiingxaki ezibangelwa yi-PCB.

Ingena njani iPCB emzimbeni

Inkunkuma eninzi ye-PCB iqokelela kwiindawo zokulahla inkunkuma, ezinokukhupha igesi. Ngokuhamba kwexesha, inkunkuma inokuphelela emachibini okanye elwandle. Nangona i-PCBS inganyibiliki emanzini, iyanyibilika kwi-oyile kunye namafutha, anokuthi aqokelele kwizinto eziphilayo zaseLwandle, ngakumbi ezinkulu ezifana nookrebe kunye namahlengesi. I-PCBS iyatsalwa xa sisitya intlanzi enzulu yolwandle okanye okunye ukutya okungcolisekileyo, kuquka iimveliso zobisi, amafutha enyama kunye namafutha. Ukufakwa kwe-PCB kugcinwa ikakhulu kwizicubu zomntu, zinokudluliselwa kwimveku engekazalwa nge-placenta ngexa lokukhulelwa, kwaye ikhutshwe kubisi lomntu.

Iziphumo zePCB kumzimba womntu

Ukonakala kwesibindi kunye nezintso

Ulusu lubangela induna, bomvu kwaye luchaphazela ibala

Amehlo abomvu, adumbile, akhululekile kwaye imfihlo yanda

Inkqubo yokuphendula ngokudodobala kwengqondo, ukukhubazeka kwezandla kunye neenyawo ukungcangcazela, ukuncipha kwememori, ukukhula kobukrelekrele kuvaliwe

Umsebenzi wokuzala uphazamisa ukukhuselwa kwehomoni kwaye unciphisa ukuchuma kwabantu abadala. Iintsana zidla ngokuba neziphene ekuzalweni kwazo kwaye zikhule kade ekuhambeni kwexesha

Umhlaza, ngakumbi umhlaza wesibindi. Umbutho waMazwe ngaMazwe woPhando ngoMhlaza uye wahlela i-PCBS njengenokuba yi-carcinogenic

Ulawulo lwe-PCB

Ngo-1976, iCongress yalela ukwenziwa, ukuthengiswa kunye nokusasazwa kwePCBS.

Ukusukela ngeminyaka yoo-1980, amazwe aliqela anjengeNetherlands, iBritani neJamani, abeke imiqathango kwi-PCB.

Kodwa nangona kukho izithintelo, imveliso yehlabathi yayisengama-22 ezigidi zeeponti ngonyaka ngo-1984-89. Akubonakali kunokwenzeka ukumisa imveliso ye-PCB kwihlabathi liphela.

siphelo

Ungcoliseko lwe-PCB, oluqokelelwe kwiminyaka, lunokuthiwa jikelele, phantse konke ukutya kuninzi okanye kuncinci, kunzima ukukuphepha ngokupheleleyo. Into esinokuyenza kukunikela ingqalelo ekutyeni esikutyayo, siphakamise ulwazi kunye nenkxalabo malunga nokukhuselwa kwendalo, kwaye sinethemba lokukhuthaza abenzi bomgaqo-nkqubo ukuba bathathe ulawulo olufanelekileyo.