PMID: 15382851Sep 24, 2004Paper

Molybdenum scavenging by iron monosulfide

Environmental Science & Technology
George R HelzMani D Kahn

Abstract

Molybdenum profiles in dated sediment cores provide useful historical information about anoxia in anthropogenically impacted natural waters but would be of greater service if Mo fixation mechanisms were better understood. Here, we explore Mo scavenging by precipitated FeS in a model system consisting of an FeIII-bearing kaolinite (KGa-1B) dispersed in NaHS solutions. Test solutions contain 18 microM thiomolybdates (mainly MoOS3(2-)). Optically measuring dissolved polysulfides monitors the rate of FeS production from FeIII minerals. Even though the exposed clay surface area is large (450 m2/L), the clay itself sorbs little Mo at pH 8.6. As FeS forms, Mo is taken up in initial Mo/Fe mole ratios of 0.04-0.06, irrespective of HS- concentration (4-40 mM range). After about a day, Mo expulsion from the solids begins, accompanied by net polysulfide consumption. These changes reflect recrystallization of amorphous FeS to more ordered products such as greigite. FeS captures some MoO4(2-) but captures thiomolybdates more effectively. Kaolinite accelerates conversion of MoOS3(2-) to MoS4(2-), as predicted previously, and thiomolybdates facilitate reduction of FeIII minerals in the clay compared to Mo-free solutions. FeS is a potentially e...Continue Reading

Citations

Jul 12, 2014·Environmental Monitoring and Assessment·P L SmedleyD J Lapworth
Feb 28, 2015·Environmental Monitoring and Assessment·Mustafa Al KuisiAbdulkader M Abed
Mar 5, 2013·Biochimica Et Biophysica Acta·Wolfgang NitschkeMichael J Russell
Aug 29, 2018·Life·Michael J Russell
Jan 29, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·J J LianP A Peng
Feb 9, 2019·Free Radical Biology & Medicine·Florence MusEric S Boyd
Mar 20, 2021·The Science of the Total Environment·Anja ReckhardtHans-Jürgen Brumsack
Mar 28, 2021·The Science of the Total Environment·Linqi TianHelong Jiang

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