NDLI: Manganese and iron oxide-coated redox bars as a tool to in situ study the element sorption in wet soils

Content Provider	Springer Nature Link
Author	Dorau, Kristof Mansfeldt, Tim
Copyright Year	2015
Abstract	When studying redox conditions in soils with manganese (Mn) and iron (Fe) oxide-coated redox bars, we observed the formation of Fe oxides along the Mn oxide coating and assumed sorption of other elements from soil solution to oxide surface. The objective of this study was to investigate the formation of Fe oxides along Mn redox bars and to analyze element sorption from soil solution to either Mn or Fe oxide along redox bar coatings.We protruded Mn redox bars into solutions with defined Fe$^{2+}$ concentrations and removed the bars at distinct time intervals. The Mn oxide coating and potential Fe oxides were extracted using dithionite-citrate-bicarbonate (DCB). To investigate in situ element sorption behavior, we used previously field-installed redox bars, protruding these Mn redox bars into acidified hydroxylamine hydrochloride (AAH) to selectively extract Mn oxide and afterwards into DCB to dissolve the remaining Fe oxide coating. This two-step extraction procedure enabled the differentiation of elements bonded to either Mn or Fe oxide. Additionally, we analyzed the redox bar coatings at a very small scale (<1 mm$^{2}$) via energy-dispersive x-ray spectroscopy (EDX).Iron oxides precipitated along the Mn oxide coating at low concentrations of 0.05 mg Fe$^{2+}$ L$^{−1}$, but did not trigger a color change. Although a change in color did occur instantaneously at 500 mg Fe$^{2+}$ L$^{−1}$, it is expected that Fe$^{2+}$ concentrations are significantly lower under field conditions because ferrous Fe auto-oxidized within the artificial setup. Whereas Mn oxide sorbed cationic elements from the soil solution in the order Cu > Pb > Zn, Fe oxide preferentially sorbed oxyanions with As > P > Mo > V, respectively. “Field”-Fe oxides precipitating along the Mn redox bars sorbed elevated levels of As and P compared with the action of synthesized “lab”-Fe oxides along Fe redox bars, a finding which we attribute to short-range-ordered Fe phases with elevated sorption capacity.Besides providing information regarding the monitoring of soil redox status, the developed sequential two-step extraction procedure enables the differentiation of the selective sorption of elements in the soil solution to the coating of Mn and Fe redox bars. The collection of Fe oxides formed naturally along the Mn redox bar coatings further enables the investigation of temporally and spatially diverse Fe oxide-forming processes.
Starting Page	976
Ending Page	986
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	16
Issue Number	3
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ferrous iron Iron oxide Manganese oxide Metal element sorption Redox conditions Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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