Ravi Kukkadapu

Characterization of Mercury Reduction by Fe(II) Minerals

Lead Institution

Rutgers University

Principal Investigator

Nathan Yee

Project type

Large-Scale EMSL Research

Mercury is a key contaminant of concern found in Department of Energy sites. Because the chemical form of Hg strongly affects its toxicity and subsurface transport, there is significant interest in…

Coupling of Fe and Tc Speciation in Subsurface Sediments: Implications to Long-Term Tc Immobilization (Zachara NABIR-Fe/Tc, PNNL Scope # 40761)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Creating an in-situ bio-barrier containing sediment-bound, biogenic FE(II) to reduce and collect mobile Tc(VII)O4 - The research objective is to provide scientific insights on the rates of reductive…

Structure and Chemical Mapping of Soil Organic Matter on Mineral Surfaces

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Ravi Kukkadapu

Secreted and decomposing soil organic matter (SOM) containing carbon, nitrogen, phosphorus, and metals form the basis of many bio/organic matter-mineral interactions in soils. These compounds are …

Biogeochemical Processes Responsible for the Enhanced Transport of Plutonium under Transient Unsaturated Condtions.

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Ravi Kukkadapu

Project type

Large-Scale EMSL Research

Plutonium is an element of concern because of its radiotoxicity. At Savannah River Site (SRS), as a result of processing Pu for nuclear weapons, some ~60 Ci of 238Pu and 239Pu was released into…

Remediation & Closure Science Project/ Subsurface Science Tasks (Zachara/Freshly, EM-closure, PNNL Scope #47040). [was aka S & T Road Mapping for Needs From All Sources (PNNL Scope #30998)].

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Hanford Remediation and Closure Science Project The Hanford Site Groundwater Protection Program, formerly the Groundwater/ Vadose Zone Integration Project, was established in 1997 to develop the…

The mechanism of pyrite formation: Implications for metal mobility during iron-sulfide transformations

Lead Institution

University of California, Riverside

Principal Investigator

Timothy Lyons

Project type

Large-Scale EMSL Research

Sulfidic sediments are a key sink for many potentially toxic trace elements in marine settings, with much of these elements ultimately being concentrated into the mineral pyrite. Pyrite can be an…

EMSL Science Overview

Ravi Kukkadapu

Projects

Characterization of Mercury Reduction by Fe(II) Minerals

Coupling of Fe and Tc Speciation in Subsurface Sediments: Implications to Long-Term Tc Immobilization (Zachara NABIR-Fe/Tc, PNNL Scope # 40761)

Structure and Chemical Mapping of Soil Organic Matter on Mineral Surfaces

Biogeochemical Processes Responsible for the Enhanced Transport of Plutonium under Transient Unsaturated Condtions.

Remediation & Closure Science Project/ Subsurface Science Tasks (Zachara/Freshly, EM-closure, PNNL Scope #47040). [was aka S & T Road Mapping for Needs From All Sources (PNNL Scope #30998)].

The mechanism of pyrite formation: Implications for metal mobility during iron-sulfide transformations