Radionuclide Coefficients for the BNL Site: For the Saturated and Unsaturated Zones

PDF Version Also Available for Download.

Description

The partition coefficient (K{sub d}) is defined as the concentration of a species of interest on the solid phase divided by the concentration of that species in the liquid phase, at steady-state. Therefore the lower the K{sub d}, the less sorption takes place. It is a parameter that is readily incorporated in chemical transport models. The K{sub d} approach to the partitioning of contaminants between soil and water in groundwater flow systems, is based on the assumption that sorption reactions are in equilibrium and are reversible. As a contaminant plume advances along flow paths, the movement of the front is ... continued below

Creation Information

Fuhrmann,M. February 1, 1999.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

The partition coefficient (K{sub d}) is defined as the concentration of a species of interest on the solid phase divided by the concentration of that species in the liquid phase, at steady-state. Therefore the lower the K{sub d}, the less sorption takes place. It is a parameter that is readily incorporated in chemical transport models. The K{sub d} approach to the partitioning of contaminants between soil and water in groundwater flow systems, is based on the assumption that sorption reactions are in equilibrium and are reversible. As a contaminant plume advances along flow paths, the movement of the front is retarded (relative to the movement of the groundwater) as a result of transfer of part of the contamination mass to the solid phase. If the input of contaminant mass to the system is discontinued, contaminants will be transferred back to the liquid phase as lower-concentration water flushes through the previously contaminated zone. Several sets of soil/water partition coefficients (K{sub d}) have been measured using BNL site specific soils and groundwater (with tracers added). They were all reported earlier through internal memos or reports. The K{sub d}s obtained for various radionuclides are determined experimentally with soils taken from different locations and depths around site. In each experiment the site specific soil and water taken from that same geoprobe boring were used. Generally tracer radionuclides were used. However, for samples from the BGRR area, water taken from the sump was used for Cs-137 and Sr-90 Kd experiments. Values of K{sub d} in the saturated zone are summarized in Table 1, as ranges and an average. Soil sample identifications, locations, and descriptions are provided in Table 2 and Figure 1. Other experiments, specific to the unsaturated zone at the BGRR, are discussed below. In addition, each data source, including methods, is reproduced in Appendix A, including figures documenting isotherm experiments for the various soil samples used. The values of n above are the number of different locations or depths from which soil was sampled for K{sub d} evaluations. Each K{sub d} value (and n) may be the result of three to five individual experiments which are used to construct an isotherm. Average values reported above include skewed to high values. This is the result of preferential uptake of some elements on the fine-grained detritus, weathering products and Fe oxides found at the surface. The one set of measurements of K{sub d} of surface soil was made with soil from the 650 sump outfall. Best estimates for samples at the surface and at depth (in the saturated zone of the subsurface) are also given above. Please bear in mind that these values represent an average of samples from selected locations. Overall, for samples at depth, I believe they approach reasonable sitewide averages. However, the surface soil values should only be applied to the 650 sump outfall. Locally, values may vary depending on mineralogy and grain size of the soil, as well as composition of the water flowing through it.

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: BNL--82426-2009-IR
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/968302 | External Link
  • Office of Scientific & Technical Information Report Number: 968302
  • Archival Resource Key: ark:/67531/metadc929027

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • February 1, 1999

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Usage Statistics

When was this report last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Fuhrmann,M. Radionuclide Coefficients for the BNL Site: For the Saturated and Unsaturated Zones, report, February 1, 1999; United States. (digital.library.unt.edu/ark:/67531/metadc929027/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.