PCB zvakawanikwa muzana remakore rechi19. Panguva iyoyo, motokari dzakatanga kushandiswa zvakanyanya uye kudiwa kwepeturu kwaiwedzera. Gasoline inonatswa kubva mumafuta asina kuchena, uye huwandu hwakawanda hwemakemikari, senge benzene, hunoburitswa mukuita. Kana benzene ichipisa, chlorine inowedzerwa kugadzira mushonga mutsva unonzi Polychlorinated biphenyls (PCB). Kusvika pari zvino, kune 209 zvinhu zvine hukama muPCB, zvakaverengerwa zvichienderana nenhamba yeklorini ion yainayo uye nekupinzwa.

Masikirwo uye Kushandiswa

PCB ikemikari yemaindasitiri ine zvinotevera zvivakwa:

1. Kutumira kupisa kwakasimba, asi hapana magetsi ekufambisa.

2. Haisi nyore kupisa.

3. Simba rakagadzikana, hapana shanduko yemakemikari.

4. Hainyungudika mumvura, is a fat soluble substance.

Nekuda kwezvivakwa izvi, PCB pakutanga yainzi godsend neindasitiri uye yaishandiswa zvakanyanya se dielectric, mumidziyo yemagetsi senge capacitor uye transformers, kana semvura inotsinhana kupisa kugadzirisa tembiricha panoshanda zviridzwa.

Mumazuva ekutanga, vanhu vaisaziva nezvehupfu hwePCBS uye havana kutora matanho ekuzvidzivirira, uye vakarasa marara akawanda ePCB mugungwa. Yakanga isiri iyo kusvikira vashandi vakagadzira PCB vatanga kurwara uye masayendisiti ezvezvakatipoteredza akawana PCB yemukati mune zvipenyu zveMarine kuti vanhu vakatanga kuterera kumatambudziko anokonzerwa nePCB.

PCB inopinda sei mumuviri

Tsvina yakawanda yePCB inoungana mumarara, ayo anogona kuburitsa gasi. Nokufamba kwenguva, tsvina inogona kuguma mumadziva kana mumakungwa. Kunyangwe PCBS isinganyungudike mumvura, inonyungudika mumafuta nemafuta, ayo anogona kuungana muZvipenyu zveMarine, kunyanya zvakakura senge shark nema dolphin. PCBS inoputirwa patinodya hove dzakadzika-dzegungwa kana chimwe chikafu chakashatiswa, kusanganisira zvigadzirwa zvemukaka, nyama nyama nemafuta. PCB yakamwiswa inonyanya kuchengetwa munyama yemunhu, inogona kutapurirwa kumwana mudumbu kuburikidza neplacenta panguva yekuzvitakura, uye zvakare kuburitswa mumukaka wemunhu.

Mhedzisiro yePCB pamuviri wemunhu

Kukuvadza kwechiropa neitsvo

Ganda rinokonzera mburwa, kutsvuka uye kukanganisa pigment

Meso akatsvuka, akazvimba, haana kugadzikana uye secretions inowedzera

Nervous system reaction retardation, kuremara maoko nemakumbo kudedera, kuderera kwendangariro, kukura kwenjere kwakavharika.

Basa rekubereka rinokanganisa kubudiswa kwehomoni uye rinoderedza kubereka kwevanhu vakuru. Vacheche vanowanzotambura nekuremara pakuberekwa uye kukura zvishoma nezvishoma muupenyu

Gomarara, kunyanya kenza yechiropa. Sangano reInternational Organisation reCancer pamusoro peCancer rakaisa PCBS seinogona kuita carcinogenic

Kudzora kwePCB

Muna 1976, Congress yakarambidza kugadzirwa, kutengesa uye kugovera PCBS.

Kubva ma1980s, nyika dzinoverengeka, dzakaita seNetherlands, Britain neGerman, dzakatemesa zvirango paPBB.

Asi kunyangwe nezvirambidzo zviripo, kugadzirwa kwepasirese kwaive kuchiri 22 miriyoni mapaundi pagore muna 1984-89. Zvinoita sezvisingaite kumisa PCB kugadzirwa pasi rese.

kugumisa

Kusvibiswa kwePCB, kwakaunganidzwa kwemakore, kunogona kunzi kune pasi rose, zvinenge zvokudya zvose zvakanyanya kana zvishoma zvakasvibiswa, zvakaoma kudzivisa zvachose. Zvatingaite ndezvekuteerera chikafu chatinodya, kusimudzira ruzivo uye kunetseka nezvekuchengetedzwa kwezvakatipoteredza, uye tinovimba kukurudzira vanogadzira mitemo kuti vatore kudzora kwakakodzera.