Nzira itsva yekuongorora, inozivikanwa nekunyatsojeka uye kunzwa kwakasimba, yakagadzirwa zvinobudirira kuti ionekwe 4,4′-methylene-bis-(2-chloroaniline), inozivikanwa se "MOCA," muweti yemunhu. Zvakakosha kuziva kuti MOCA ikenza inowanikwa zvakanaka, ine humbowo hwehupfu hunosimbisa kuti ine kenza mumhuka dzemurabhoritari dzakadai semakonzo, mbeva, nembwa.
Vasati vashandisa nzira iyi itsva munzvimbo dzebasa chaidzo, chikwata chevaongorori chakatanga chaita ongororo yenguva pfupi vachishandisa makonzo. Chinangwa chikuru chechidzidzo ichi chepamberi pekuongororwa kwaive kuona nekujekesa zvimwe zvinhu zvakakosha zvine chekuita nekubuda kweMOCA muweti mumuenzaniso wemhuka—kusanganisira zvinhu zvakaita sehuwandu hwekubuda, nzira dzemuviri, uye nguva yemazinga anoonekwa—vachiisa hwaro hwakasimba hwesainzi hwekushandiswa kwenzira iyi mumienzaniso yevanhu.
Mushure mekupedzwa nekusimbiswa kwechidzidzo chepamberi pekuongororwa, nzira iyi yekuona weti yakashandiswa zviri pamutemo kuongorora huwandu hwekusangana neMOCA pabasa pakati pevashandi mumakambani emaindasitiri ekuFrance. Ongororo iyi yakafukidza mhando mbiri huru dzezviitiko zvebasa zvine chekuita neMOCA: imwe yaive nzira yekugadzira maindasitiri yeMOCA pachayo, uye imwe yaive kushandiswa kweMOCA semushonga wekuporesa mukugadzira ma polyurethane elastomers, mamiriro akajairika muindasitiri yemakemikari nezvinhu.
Kuburikidza nekuongororwa kukuru kwemasampuli eweti akaunganidzwa kubva kuvashandi mumamiriro ezvinhu aya, timu yekutsvagisa yakawana kuti huwandu hweMOCA hunobuda muweti hwakaratidza kusiyana kwakasiyana-siyana. Kunyanya, huwandu hwehuburi hunobva pamazinga asingaonekwe—anotsanangurwa seari pasi pe0.5 microgram pa litre—kusvika pa1,600 microgram pa litre. Pamusoro pezvo, apo N-acetyl metabolites yeMOCA yaivepo mumasampuli eweti, huwandu hwayo hwaive hwakaderera zvakanyanya uye hwakafanana pane huwandu hweparent compound (MOCA) mumasampuli mamwe chete, zvichiratidza kuti MOCA pachayo ndiyo fomu yekutanga inobuda muweti uye chiratidzo chakavimbika chekupinda.
Zvose zvataurwa, zvakawanikwa kubva muongororo iyi yakakura yekusangana nevashandi vakaongororwa zvakaita sezviri kuratidza mazinga eMOCA evashandi vakaongororwa, sezvo mazinga ekubvisa akaonekwa aienderana zvakanyanya nemhando yebasa ravo, nguva yekusangana nevashandi, uye mamiriro enzvimbo yekushanda. Uyezve, chinhu chakakosha kubva muchidzidzo ichi ndechekuti mushure mekunge ongororo dzaitwa uye matanho ekudzivirira akatarwa aitwa munzvimbo dzebasa—senge kuvandudza masisitimu ekufema, kusimudzira kushandiswa kwemidziyo yekudzivirira (PPE), kana kugadzirisa mashandiro ekushanda—mazinga ekubvisa weti yeMOCA muvashandi vakakanganiswa aiwanzoratidza kudzikira kuri pachena uye kwakakosha, zvichiratidza kushanda kwemaitiro aya ekudzivirira mukuderedza kusangana neMOCA pabasa.
Nguva yekutumira: Gumiguru-11-2025