Ha maemo a phahameng a trace element molybdenum (mah-LIB-den-um) a ne a sibolloa lilibeng tsa metsi a nooang ka boroa-bochabela ho Wisconsin, libaka tse ngata tsa sebaka sa ho lahlela molora oa mashala li ne li bonahala e le mohloli oa tšilafalo.

Empa mosebetsi o mong oa bofokisi o entsoeng hantle o etelletsoeng pele ke bafuputsi ba Duke University le The Ohio State University o senotse hore matangoana, a nang le mesaletsa ea mashala a chesitsoeng litsing tsa motlakase, ha se mohloli oa tšilafalo.

E tsoa mehloling ea tlhaho ho e-na le hoo.

"Ho ipapisitsoe le liteko tse sebelisang "fingerprinting" tsa forensic isotopic le mekhoa ea ho ratana le lilemo, liphetho tsa rona li fana ka bopaki bo ikemetseng ba hore molora oa mashala ha se mohloli oa tšilafalo ka metsing," ho boletse Avner Vengosh, moprofesa oa thuto ea geochemistry le boleng ba metsi Sekolong sa Duke's Nicholas. Tikoloho.

"Haeba metsi ana a nang le molybdenum a ne a tsoa moloreng oa mashala, a ka be a le manyenyane, a kentsoe hape ka har'a metsi a ka tlas'a lefatše a tsoang sebakeng sa molora oa mashala lilemong tse 20 kapa tse 30 tse fetileng," ho boletse Vengosh. "Sebakeng seo, liteko tsa rona li bonts'a hore e tsoa botebong ba lefatše mme e feta lilemo tse 300."

Liteko li boetse li senotse hore menoana ea isotopic ea metsi a silafetseng - likarohano tse nepahetseng tsa boron le strontium isotopes - ha li tsamaellane le menoana ea isotopic ea masala a mashala a tukang.

Liphuputso tsena li "de-link" molybdenum ho tloha libakeng tsa ho lahlela molora oa mashala 'me ho e-na le hoo li fana ka maikutlo a hore ke phello ea mekhoa ea tlhaho e hlahang matrix a aquifer's rock, ho boletse Jennifer S. Harkness, mofuputsi oa postdoctoral Ohio State ea ileng a etella pele thuto e le karolo. ea lengolo la hae la bongaka ho Duke.

Bafuputsi ba phatlalalitse pampiri ea bona e hlahlobiloeng ke lithaka khoeling ena koranteng ea Environmental Science & Technology.

Bongata bo bonyenyane ba molybdenum bo bohlokoa bophelong ba liphoofolo le limela, empa batho ba e jang haholo ba kotsing ea ho ba le mathata a kenyeletsang phokolo ea mali, bohloko ba manonyeletso le ho thothomela.

Tse ling tsa liliba tse lekiloeng ka boroa-bochabela ho Wisconsin li ne li e-na le li-micrograms tse 149 tsa molybdenum ka litha e le ngoe, e fetang habeli tekanyetso ea boemo bo sireletsehileng ba ho noa ea Mokhatlo oa Lefatše oa Bophelo, e leng li-microgram tse 70 ka litha e le ngoe. Setsi sa Tšireletso ea Tikoloho sa US se beha moeli le ho feta ho li-microgram tse 40 ka litha e le ngoe.

Ho khanna thuto e ncha, Harkness le basebetsi-'moho le eena ba ile ba sebelisa li-tracers tsa forensic ho fumana hore na boron le strontium isotopes e 'ngoe le e 'ngoe ea metsi ke efe. Ba boetse ba lekanya sampole e 'ngoe le e 'ngoe ea tritium le helium radioactive isotopes, tse nang le litekanyetso tse sa khaotseng tsa ho bola 'me li ka sebelisoa ho lekola lilemo tsa sampuli, kapa "nako ea ho lula" metsing a ka tlas'a lefatše. Ka ho kopanya lihlopha tsena tse peli tsa liphuputso, bo-rasaense ba ile ba khona ho kopanya boitsebiso bo qaqileng ka histori ea metsi a ka tlas'a lefatše, ho akarelletsa le ha a qala ho kenella ka metsing, le hore na ke mefuta efe ea majoe ao a neng a sebelisana le 'ona ha nako e ntse e feta.

“Tlhahlobo ena e senotse hore metsi a phahameng a molybdenum ha a tsoe moloreng oa mashala ka holim’a metsi, empa a bakoa ke liminerale tse nang le molybdenum tse ngata sebakeng sa aquifer matrix le maemo a tikoloho sebakeng se tebileng sa metsi a lumellang hore molybdenum ena e lokolloe. metsi a ka tlas’a lefatše,” Harkness a hlalosa.

"Se ikhethang ka morero ona oa lipatlisiso ke hore o kopanya mekhoa e 'meli e fapaneng - menoana ea isotopic le lilemo tsa ho intša - thutong e le' ngoe," o boletse joalo.

Leha boithuto bo ne bo tsepamisitse maikutlo lilibeng tsa metsi a nooang Wisconsin, liphuputso tsa eona li kanna tsa sebetsa libakeng tse ling tse nang le libaka tse tšoanang tsa jeoloji.

Thomas H. Darrah, motlatsi oa moprofesa oa saense ea lefats'e Ohio State, ke moeletsi oa postdoctoral oa Harkness oa Ohio State 'me e ne e le mongoli-'moho le eena oa thuto e ncha.