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Lo mbhodamo wamanzi elothe usengxakini ngaphezu kweenyanga ezimbini, kwaye ekugqibeleni kumiselwe ukuba “umoni okhokelayo” kukuba i-tin soldering material yomqala wobhedu iqulethe ilothe. Umbutho osebenzayo osekwe ngurhulumente waseHong Kong ukuphanda ukukhokela ngokugqithisileyo kumanzi okusela ukhuphe iziphumo zokuqala ngoSeptemba 25. Kwafunyaniswa ukuba iisampulu zeendawo zokuwelda umqala wobhedu eKang Ching House, Kai Ching Village equlethwe 41% yelothe, 585 amaxesha aphezulu kunomgangatho waseBritane. Iqela elisebenzayo alizange liphendule malunga nokuba ikontraka ebandakanyekayo iya kuphendula ngokusebenzisa amajelo asemthethweni, kodwa wenze inani leengcebiso, kubandakanywa ukusetyenziswa kokuthengwa kwe-central ye-welding materials kwixesha elizayo, ukuze kuncitshiswe ukuthenga ngempazamo ezantsi.
Kwiinyanga ezimbini ezidlulileyo, Iqela lomsebenzi lihlole isigaba sesibini seQiqing Village kunye neKwai Lian Village apho umxholo okhokelayo kumanzi okusela ugqithise umgangatho., kwaye isuswe ngaphezulu kwe 100 amacandelo enkqubo yonikezelo lwamanzi lwangaphakathi, kubandakanya 44 imibhobho yobhedu, 28 amasango, kwaye 3 Imitha yamanzi, 12 iifaucets kunye 47 izikhundla zokuwelda zahanjiswa zabuyiselwa elabhoratri kwiimvavanyo ezahlukeneyo, ngexesha apho kwakusetyenziswa imibhobho yentsimbi engatyiwa kwilali yaseHong Fuk, Yuen Long, iimvavanyo zokuthelekisa.
Iqela elisebenzayo lithe ukusukela oko lihlole iitanki zamanzi angaphantsi komhlaba kunye neetanki zamanzi eziphezu kophahla lwesigaba sesibini seKai Ching Village kunye neKwai Lian Village., kwafunyaniswa ukuba kukho ngaphantsi kwe 1 microgram yelothe ilitha nganye yamanzi, kunye nemibhobho yamanzi esuka ngaphantsi emhlabeni ukuya eluphahleni yayenziwe ngemibhobho yentsimbi. Akukho welding ebandakanyekayo, ngoko kukho isizathu sokukholelwa ukuba amanzi asuka kwimibhobho yamanzi karhulumente esiya kwizakhiwo akanalothe. Eyona nto iphambili yolu phando yimibhobho yobhedu eyehla ukusuka eluphahleni ukuya kumgangatho ngamnye.
Ilungu leqela lomsebenzi u-Chen Hanhui wachaza ukuba uvavanyo lokukhululwa kukujolela amanzi kumacandelo 24 iiyure ukubala isixa esipheleleyo kunye nobunzima obuthile belothe ekhutshiweyo kwicandelo ngalinye lekhonkco lonikezelo lwamanzi lilonke. Iziphumo zovavanyo lokukhululwa zifumene ukuba kwikhonkco lokubonelela ngamanzi eKang Ching House, Idolophana yaseKai Ching, Ilothe yakhutshwa kumasango engxubevange yobhedu, Iifoto, kunye nemibhobho yobhedu/izikhundla ezithambileyo zokuthambisa ezinobubanzi obungaphantsi 76 mm. Phakathi kwabo, isixa sokukhululwa kwezikhundla ze-soldering yayiphezulu. Uhlalutyo lwezinto ezibonakalayo lubonise ukuba umxholo ophambili wawukho 41%, eyayikho 585 amaxesha umxholo ophambili we 0.07% kumgangatho waseBritani.
Iqela elisebenzayo likwafumanise ukuba isiqulatho esikhokelayo kumanzi okusela kwezi lali zimbini singaphezulu komgangatho kwaye akubangelwa kukufakelwa kwemibhobho yobhedu.. Iqela lenze uhlalutyo lwesayensi lwe-isotope ekhokelayo kwaye lafumanisa ukuba i-isotope ekhokelayo ye-lead-tin izinto ezithengiswayo kunye ne-copper alloy fixtures ngokucacileyo ngamaqela amabini ahlukeneyo., kunye ne-isotopu yezinto ezithengiswayo ezinelothe kunye neesampulu zamanzi ezinomxholo ogqithisiweyo welothe Imindilili iyahambelana kakhulu.. Ngamanye amazwi, ilothe emanzini iphuma kwizinto zokuthambisa.
Ukwengeza, iqela labasebenzi lafumanisa ukuba ezinye iikontraka zazijikile umva. Amasango kunye neempawu zompompo ezifakwe kwezinye iindawo zezindlu zoluntu azizange zifane nezo zazingeniswe ekuqaleni kwiSebe loNikezelo lwaManzi.. Unobhala weqela kunye nomncedisi womlawuli weSebe loNikezelo lwaManzi, Leung Chung-li, ichaze ukuba uphawu lwesitshixo sesango esisetyenziswa kwilali yaseKai Ching yahlukile kuhlobo olubhengeziweyo, kunye nomxholo okhokelayo wokutshintshwa kwesango awuhambelani nomgangatho waseBrithani. Iqela liya kulandelelanisa umthengisi wezinto eziphathekayo ofanelekileyo. Musa ukukhuphela ngaphandle kokuyisusa kuluhlu oluvunyiweyo.
Ukwenzela ukuthintela ukwenzeka kwelothe kumanzi okusela, igqiza lenze iqela leengcebiso, kubandakanywa nokuhlolwa kwesiza okwaneleyo nokwarhoqo kwenziwa ngabantu abaqeqeshiweyo beSebe leZakhiwo; ukusetyenziswa kovavanyo olukhokelela ngokukhawuleza okanye i-X-ray fluorescence spectrometers kwizikhundla ze-welding; kunye nemfuneko yelayisenisi Abatywini kunye nabantu abagunyazisiweyo bongeze iiparamitha ezine ezintsha kuvavanyo lomgangatho wamanzi wenkqubo yonikezelo lwamanzi lwangaphakathi esanda kugqitywa., ezizezi lead, chromium, cadmium kunye nickel; kucetyiswa ukuba uGunyaziwe weZindlu afunde ngokusetyenziswa kwezinto zokuwelda ezithengwa kumbindi; kwaye kucetyiswa ukuba iGunya laManzi liphonononge ngokutsha umthetho ofanelekileyo.
Eli gqiza kulindeleke ukuba lipapashe ingxelo yalo yokugqibela yophando phakathi ku-Okthobha. Iqela elisebenzayo liye lavavanya ukukhutshwa kwezinye iintsimbi ezintathu ezinzima, kuquka i-cadmium, chromium kunye ne-nickel kuzo zonke iindawo zenkqubo yokubonelela ngamanzi. Iziphumo zabonisa ukuba kwabhaqwa nickel ekhitshini kunye neempompo zomatshini wokuhlamba weyunithi yeKangqing House eKai Ching Village.. Nangona kunjalo, kukho umlinganiselo omncinci wamanzi kumpompo, kwaye i-nickel inokuhlanjwa emva kwesibini okanye ezimbini. Iziphumo zovavanyo lokukhutshwa kwe-cadmium kunye nechromium kwisixhobo ngasinye zingaphantsi kwinqanaba elinokubonwa, yiyo i, umxholo ungaphantsi 1 microgram nganye ilitha yamanzi.
