edbyanumberofauthors,andagoodsummaryofthiosulfateleachingexperimentsundertakeninthepresenceandabsenceofairspargingarepresentedbySenanayake().Sincetheadditionorcontrolofoxygenundergroundislikelytobedifficult,thecopper-ammoniasystemisunlikelytobeeffectiveforaninsituleachingenvironment.Howevertwopromisingiron(III)oxidantshavebeenindependentlydeveloped;oneusingethylenediaminetetraaceticacid(formingFe(EDTA)_)(Zhangetal.,),andtheotherusingoxalate(formingFe(CO)_)(ChandraandJeffrey,).Bothofthesecomplexesareverystable,withlogb(Fe(EDTA)_)=.(SmithandMartell,)andlogb(Fe(CO))=.(SmithandMartell,).Themainadvantageinusingiron(III)basedoxidantsisthattheyhavebeenclaimedtounreactivetowardsthiosulfate(comparedtocopper(II)ammineTherefore,theymaypotentiallybeusedinananaerobicenvironment,sinceoxygenmaynotberequiredtoregeneratetheoxidant.Anotheradvantageoftheiron(III)oxidantsisthatam到证实。
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