Iqela lophando laseTshayina liqukumbela kuphononongo lwakutsha nje ukuba imichiza eyingxaki ayizange ivavanywe ngokwaneleyo kwixesha elidlulileyo. Uphononongo lubonisa ukuba iikhompawundi eziguquguqukayo zeklorini eziguquguqukayo kumasuntswana othuli lwezimbiwa kwi-atmosfera inokuguqulwa ibe yi-polychlorinated dibenzo-p-dioxins enetyhefu kakhulu kunye ne dibenzofurans phantsi kokukhanya kwelanga.
Iikhemikhali ezinobungozi zihlala zivavanywa kwimimiselo yelizwe kunye neyezizwe ngezizwe ezijolise ngokukodwa kwiipropati zabo ezinobuthi, ukunyamezela kokusingqongileyo, kunye nokuqokelela kwizinto eziphilayo. Utshintsho abalwenzayo kwi-atmosfera luqwalaselwa kancinci okanye alunakwathathelwa ngqalelo, nangona iimveliso zenguqu yesibini zinokubonisa ubutyhefu obuphezulu kunye nokuzingisa. Uvavanyo olwaneleyo lwemingcipheko yokusingqongileyo kunye nempilo yeekhemikhali zorhwebo, olu tshintsho kufuneka lucaciswe.
Ukusuka kulo mbono, iqela elikhokelwa nguXiaole Weng ovela kwiYunivesithi yaseZhejiang (i-Hangzhou, eChina) ihlolisise i-voltative chlorinated organic compounds (CVOCs). Ezi zikhemikhali ezibalulekileyo zorhwebo ezisetyenziswa ngokubanzi kwishishini kunye nezolimo kwaye zisetyenziselwa, umzekelo, kwiipende kunye ne-varnishes, ukucoca okomileyo, okanye ukuqhutyelwa phambili kwi-pesticides. Amaziko okutshisa inkunkuma kunye neendawo zokulahla inkunkuma zezinye zemithombo yokukhutshwa kwenkunkuma. Ngokukhula kwemizi-mveliso, ukukhutshwa kwe-CVOC kuya kuqhubeka nokunyuka, ngakumbi kumazwe asakhasayo. Ii-CVOCs zaziwa njengezandulela kwiikhompawundi ze-dioxin kwiinkqubo zokutsha kwimizi-mveliso. Umzekelo, i-chlorobenzenes, i-catalyzed yi-fly ash, ingatshintshwa ibe yi-polychlorinated dibenzo-p-dioxins kunye ne dibenzofurans (PCDD/Fs). Amalungu amaninzi eli qela lezinto ziyityhefu kunye ne-carcinogenic, njengoko isaziwa ngokubanzi ukususela kwingozi yekhemikhali etshabalalisayo e-Seveso ngo-1976. Nangona kunjalo, kusekho idatha encinci malunga nekamva kunye neenguqu ezinokuthi zibe khona zee-CVOCs emoyeni.
Iincinci ze-atmospheric ziqulethe, phakathi kwezinye izinto, isinyithi kunye neeminerali ze-aluminium, ezinokuthi zisebenze ngokukhawuleza. Iqela licinge ukuba ezi zinokubangela ukuguqulwa kwee-CVOCs kwi-PCDD/Fs phantsi kokukhanya kwelanga kwaye ngaloo ndlela ibe ngumthombo obalulekileyo, ongahoywanga we-dioxins. Ukuvavanya le ngcamango, abaphandi baqhube iimvavanyo zaselabhoratri kwiintlobo ezahlukeneyo zeeminerali kwaye bachonga iindlela zokusabela ezinokwenzeka usebenzisa izibalo zekhompyutha. Emva koko, uvavanyo lwentsimi kunye nomoya ojikelezayo kunye nomlotha wokuwa lwenziwa kwipaki yoshishino, eqinisekisa ukwenzeka kokuguqulwa kweefotochemical kwi-atmosphere yangempela.
Iziphumo zibonisa ukuba ii-CVOC ezifumaneka kuyo yonke indawo, ezifana ne-monochlorobenzene, i-dichloromethane, kunye ne-perchloroethylene, zinokuba zizinto ezingcolisayo ezingakhange ziqwalaselwe ze-PCDDs/Fs. Ii-iron oxides (α-Fe₂O₃) zidlala indima ebaluleke kakhulu ekwakhiweni kwee-chlorophenols kunye nee-dioxin compounds. Uvavanyo kwiimpuku lukwabonise ukuba uthuli lwe-iron oxide lubangele umonakalo omkhulu kwizicubu zemiphunga kunye nobuchopho emva kwe-photochemical reaction.
Uphononongo luqaqambisa imfuneko yokuphinda kuphononongwe ubutyhefu bezinto ezingcolisayo ze-atmospheric precursor, ezifana nee-CVOCs zorhwebo, kunye notshintsho lwazo.
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