In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation.

In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Research Abstract Details 

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In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Abstract Text:

Ralph D Ludwig,Chunming Su,Tony R Lee,Richard T Wilkin,Steven D Acree,Randall R Ross,Ann Keeley,

A field study was conducted to evaluate the performance of a ferrous iron based in situ redox zone for the treatment of a dissolved phase Cr(VI) plume at a former industrial site. The ferrous iron based in situ redox zone was created by injecting a blend of 0.2 M ferrous sulfate and 0.2 M sodium dithionite into the path of a dissolved Cr(VI) plume within a shallow medium to fine sand unconfined aquifer formation. Monitoring data collected over a period of 1020 days after more than 100 m of linear groundwater flow through the treatment zone indicated sustained treatment of dissolved phase Cr(VI) from initial concentrations between 4 and 8 mg/L to less than 0.015 mg/L. Sustained treatment is assumed to be primarily due to the reduction of Cr(VI) to Cr(III) by ferrous iron adsorbed to, precipitated on, and/or incorporated into aquifer iron (hydr)oxide solid surfaces within the treatment zone. Precipitated phases likely include FeCO3 and FeS based on saturation index considerations and SEM/EDS analysis. The detection of solid phase sulfites and thiosulfates in aquifer sediments collected from the treatment zone more than 2 years following injection suggests dithionite decomposition products may also play a significant role in the long-term treatment of the dissolved phase Cr(VI).

In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Publishing Authors By Initials

RD Ludwig,C Su,TR Lee,RT Wilkin,SD Acree,RR Ross,A Keeley,

For similar complex mixtures: soil research abstracts see: complex mixtures: soil research

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In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Environmental science & technology

VOLUME: 41

Page Numbers: 5299-305

Journal Abbreviation: Environ. Sci. Technol.

ISSN: 0013-936X

DAY: 1

MONTH: Aug

YEAR: 2007

In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Information

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LANGUAGE: eng

NlmUniqueID: 213155

In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Keywords Mesh Terms:

KEYWORDS: Soil

MESH TERMS: analysis

Chemical & Substance for Abstract: In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation. Information

Substance Name: ferrous sulfate

Registry Number: 7720-78-7

Grant and Affiliation Information for In situ chemical reduction of Cr(VI) in groundwater using a combination of ferrous sulfate and sodium dithionite: a field investigation.

AFFILIATION: United States Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, 919 Kerr Research Drive, Ada, Oklahoma 74820, USA. ludwig.ralph@epa.gov

Country: United States

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MEDLINETA: Environ Sci Technol

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