【摘 要】
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Manganese is ubiquitous in terrestrial environ-ments and most studies have focused on dissolution of Mn oxides,but aluminosilicates also release Mn.Here,we eval
【机 构】
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Department of Geosciences,University of Massachusetts,Morrill Science Center 3,611 North Pleasant St
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Manganese is ubiquitous in terrestrial environ-ments and most studies have focused on dissolution of Mn oxides,but aluminosilicates also release Mn.Here,we evaluated oxic Mn dissolution from six rocks and minerals(amphibolite,anorthosite,kaolinite,kyanite,muscovite,orthoclase feldspar)and soils from four Critical Zone Observatories(CZOs)under four LMWOLs treatments(catechol,citric acid,oxalic acid,control).Overall rock and mineral Mn mass-normalized release was 1.4±0.5 nM μM-1 14 d-1 and dissolution rate was 2403±935 nM m-2 d-1×103.Overall CZO soil Mn release was 16.7±5.1 nM μM-1 14 d-1 and dissolution rate was 7010±2570 nM m-2 d-1×103.Anorthosite and kyanite had the highest Mn dissolution rates but kaolinite and kyanite had the highest Mn mass-normalized release rates.We hypothesize the structural location of Mn,surface area,and potential inclusions of highly-weather-able-phases control Mn dissolution for rocks and minerals.CZO soils with the highest solid phase Mn had the highest Mn release and dissolution rates.Citric acid and catechol had higher Mn release and dissolution rates than the control while oxalic acid did not.For rocks and minerals,we found pH 4 had higher Mn release and dissolution rates than pH 6,but not for control treatments without LMWOL.Our study highlights that the abundance of Mn drove Mn release in soils but not rocks and minerals.Moreover,LMWOLs are important for Mn dissolution,even under acidic pH conditions.
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