Xa amanqanaba aphezulu e-trace element molybdenum (mah-LIB-den-um) afunyanwa kumaqula amanzi okusela kumzantsi-mpuma weWisconsin, iindawo ezininzi zokulahla uthuthu lwamalahle kulo mmandla zibonakala ngathi zingumthombo wosulelo.

Kodwa umsebenzi othile wokuhlola owenziwe kakuhle okhokelwa ngabaphandi abavela kwiYunivesithi yaseDuke kunye neYunivesithi yaseOhio State uye watyhila ukuba amachibi, aqulethe iintsalela zamalahle atshiswe kwizityalo zamandla, ayingomthombo wongcoliseko.

Isuka kwimithombo yendalo endaweni yoko.

"Ngokusekwe kuvavanyo olusebenzisa i-isotopic ye-forensic isotopic 'yokuprinta iminwe' kunye nobuchule bobudala, iziphumo zethu zibonelela ngobungqina obuzimeleyo bokuba umlotha wamalahle awungomthombo wongcoliseko emanzini," utshilo u-Avner Vengosh, unjingalwazi we-geochemistry kunye nomgangatho wamanzi kwi-Duke's Nicholas School of. indlela eyiyo.

“Ukuba la manzi atyebileyo e-molybdenum ebevele ekugxobhozweni kothuthu lwamalahle, ebeya kuba mancinci ngokwentelekiso, aphinde agalelwa kumanzi aphantsi komhlaba ale ngingqi esuka kwidiphozithi yothuthu lwamalahle phezu kweminyaka engama-20 okanye engama-30 kuphela eyadlulayo,” utshilo uVengosh. Endaweni yoko, iimvavanyo zethu zibonisa ukuba iphuma ngaphantsi komhlaba kwaye ingaphezulu kweminyaka engama-300 ubudala.

Uvavanyo lukwaveze ukuba umnwe wamanzi angcolisekileyo we-isotopic-umlinganiselo ochanekileyo we-boron kunye ne-strontium isotopes-awuhambisani neminwe ye-isotopic yentsalela yokutsha kwamalahle.

Ezi ziphumo “de-link” i molybdenum ukusuka kwiindawo zokulahla uthuthu lwamalahle kwaye endaweni yoko icebisa ukuba sisiphumo seenkqubo zendalo ezenzeka kwi-matrix yelitye le-aquifer, utshilo uJennifer S. Harkness, umphandi we-postdoctoral e-Ohio State okhokele isifundo njengenxalenye. kwisifundo sakhe sobugqirha eDuke.

Abaphandi bapapashe iphepha labo elihlaziywe ngontanga kule nyanga kwiphephancwadi iSayensi yeNdalo kunye neTekhnoloji.

Izixa ezincinci zemolybdenum zibalulekile kuzo zombini izilwanyana kunye nezityalo, kodwa abantu abayitya kakhulu basengozini yeengxaki ezibandakanya i-anemia, iintlungu zamalungu kunye nokungcangcazela.

Amanye amaqula avavanyiweyo kumzantsi-mpuma weWisconsin aqulathe ukuya kuthi ga kwi-149 micrograms ye-molybdenum ilitha, kancinane kancinane kunomgangatho wokusela okhuselekileyo weWorld Health Organisation, oyi-70 micrograms ilitha nganye. I-Arhente yoKhuseleko lweNdalo yase-US ibeka umda nangaphantsi kwi-microgram ye-40 ilitha.

Ukuqhuba isifundo esitsha, uHarkness kunye noogxa bakhe basebenzisa iitrayisi ze-forensic ukumisela umlinganiselo we-boron ukuya kwi-strontium isotopes kwisampuli nganye yamanzi. Baye balinganisa i-tritium nganye kunye ne-helium radioactive isotopes, ezinemilinganiselo yokubola rhoqo kwaye zingasetyenziselwa ukuvavanya ubudala besampulu, okanye "ixesha lokuhlala" kumanzi aphantsi komhlaba. Ngokudibanisa ezi seti zimbini zezinto ezifunyenweyo, izazinzulu ziye zakwazi ukuhlanganisa ulwazi oluneenkcukacha malunga nembali yamanzi aphantsi komhlaba, kubandakanywa nokungena okokuqala kwi-aquifer, kwaye zeziphi iindidi zamatye eziye zadibana nazo ekuhambeni kwexesha.

“Olu hlalutyo lubonise ukuba amanzi e-molybdenum ephezulu akasuki kwiidiphozithi zothuthu lwamalahle phezu komhlaba, koko abe sisiphumo seminerali ene-molybdenum etyebileyo kwi-aquifer matrix kunye neemeko zokusingqongileyo kwi-aquifer enzulu evumela ukukhululwa kwale molybdenum kwi-aquifer matrix. amanzi aphantsi komhlaba,” watsho uHarkness.

"Yintoni ekhethekileyo ngale projekthi yophando kukuba idibanisa iindlela ezimbini ezahlukeneyo-iminwe ye-isotopic kunye neminyaka yobudala-kwisifundo esinye," watsho.

Nangona uphononongo lujolise kumaqula amanzi okusela eWisconsin, iziphumo zalo zinokuthi zisebenze kwezinye iingingqi ezinejoloji ezifanayo.

UThomas H. Darrah, uprofesa onxulumene nesayensi yomhlaba kwi-Ohio State, ungumcebisi we-postdoctoral we-Harkness kwi-Ohio State kwaye wayengumbhali-mbhali wesifundo esitsha.