Daniel Kaplan

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…

Influence of Rhizosphere Iron on Carbon Cycling in a Wetland Environment

Lead Institution

Savannah River National Laboratory

Principal Investigator

Daniel Kaplan

Project type

Large-Scale EMSL Research

About 20% of the earth's carbon resides in wetlands and another 20% of the organic carbon in sediment is associated to reactive iron phases, either existing in wetlands or elsewhere. This…

Rhizosphere Iron and Carbon Influence on Uranium Redox Cycling in a Wetland Environment

Lead Institution

Savannah River National Laboratory

Principal Investigator

Daniel Kaplan

Project type

Special Science

All mobile contaminants in the upper aquifer eventually resurface in wetland areas. Due to their unique redox gradients and elevated microbial and organic carbon levels, wetlands tend to immobilize…

Radionuclide Immobilization in Reducing Cementitious Materials

Lead Institution

Savannah River National Laboratory

Principal Investigator

Daniel Kaplan

Project type

Large-Scale EMSL Research

Reducing cementitious materials are used as waste forms and engineered barriers for low-level radioactive waste disposal in the vadose zone. These materials are specifically formulated to contain…

Stream Floc Processes Involving Ferrous Iron Oxidation in a Riparian Wetland

Lead Institution

Savannah River National Laboratory

Principal Investigator

Daniel Kaplan

Project type

Limited Scope

One of the defining characteristics of wetlands is the permanent or intermittent presence of standing water. They provide many critical ecosystem services, including water storage, and fertilizer and…

Enhance Plutonium Mobility During Long-Term Transport Through an Unsaturated Subsurface Environment: Iron and Manganese Oxide Characterization

Lead Institution

Savannah River National Laboratory

Principal Investigator

Daniel Kaplan

Project type

Exploratory Research

Plutonium mobility in the subsurface environment is significantly influenced by its oxidation state: Pu(V/VI) is 500 times more mobile than Pu(III/IV). Plutonium (IV) and Pu(VI) were placed in…

EMSL Science Overview

Daniel Kaplan

Projects

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

Influence of Rhizosphere Iron on Carbon Cycling in a Wetland Environment

Rhizosphere Iron and Carbon Influence on Uranium Redox Cycling in a Wetland Environment

Radionuclide Immobilization in Reducing Cementitious Materials

Stream Floc Processes Involving Ferrous Iron Oxidation in a Riparian Wetland

Enhance Plutonium Mobility During Long-Term Transport Through an Unsaturated Subsurface Environment: Iron and Manganese Oxide Characterization