skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Radionuclide complexation in xylem exudates of plants

Abstract

The plant xylem is the primary avenue for transport of nutrient and pollutant elements from the roots of aerial portions of the plant. It is proposed that the transport of reactive or hydrolyzable ions is facilitated by the formation of stable/soluble complexes with organic metabolites. The xylem exudates of soybean (Glycine max cv. Williams) were characterized as to their inorganic and organic components, complexation patterns for radionuclides, both in vivo and in vitro, and for class fractions of exudates using thin-layer electrophoresis. The radionuclides Pu-238 and Fe-59 were found primarily as organic acid complexes, while Ni-63 and Cd-109 were associated primarily with components of the amono acid fraction. Technetium-99 was found to be uncomplexed and transported as the pertechnetate ion. It was not possible to duplicate fully complexes formed in vivo by back reaction with whole exudates or class fractions, indicating the possible importance of plant induction processes, reaction kinetics and/or the formation of mixed ligand complexes. 28 refs., 4 figs.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest Labs., Richland, WA (USA)
OSTI Identifier:
5607826
Report Number(s):
PNL-SA-12549; CONF-850473-3
ON: DE85013446
DOE Contract Number:
AC06-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Seminar on the speciation of fission products in the environment, Oxford, UK, 16 Apr 1985
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; CADMIUM 109; TRANSLOCATION; GLYCINE HISPIDA; RADIONUCLIDE KINETICS; IRON 59; NICKEL 63; PLUTONIUM 238; TECHNETIUM 99; CHEMICAL COMPOSITION; COMPLEXES; ELECTROPHORESIS; EXPERIMENTAL DATA; ISOMERIC NUCLEI; PLANT SAP; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BIOLOGICAL MATERIALS; CADMIUM ISOTOPES; DATA; DAYS LIVING RADIOISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI; HOURS LIVING RADIOISOTOPES; INFORMATION; INTERMEDIATE MASS NUCLEI; IRON ISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LEGUMINOSAE; MATERIALS; NICKEL ISOTOPES; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; PLANTS; PLUTONIUM ISOTOPES; RADIOISOTOPES; TECHNETIUM ISOTOPES; YEARS LIVING RADIOISOTOPES; 560173* - Radiation Effects- Nuclide Kinetics & Toxicology- Plants- (-1987)

Citation Formats

Cataldo, D.A., McFadden, D.M., Garland, T.R., and Wildung, R.E.. Radionuclide complexation in xylem exudates of plants. United States: N. p., 1985. Web.
Cataldo, D.A., McFadden, D.M., Garland, T.R., & Wildung, R.E.. Radionuclide complexation in xylem exudates of plants. United States.
Cataldo, D.A., McFadden, D.M., Garland, T.R., and Wildung, R.E.. 1985. "Radionuclide complexation in xylem exudates of plants". United States. doi:.
@article{osti_5607826,
title = {Radionuclide complexation in xylem exudates of plants},
author = {Cataldo, D.A. and McFadden, D.M. and Garland, T.R. and Wildung, R.E.},
abstractNote = {The plant xylem is the primary avenue for transport of nutrient and pollutant elements from the roots of aerial portions of the plant. It is proposed that the transport of reactive or hydrolyzable ions is facilitated by the formation of stable/soluble complexes with organic metabolites. The xylem exudates of soybean (Glycine max cv. Williams) were characterized as to their inorganic and organic components, complexation patterns for radionuclides, both in vivo and in vitro, and for class fractions of exudates using thin-layer electrophoresis. The radionuclides Pu-238 and Fe-59 were found primarily as organic acid complexes, while Ni-63 and Cd-109 were associated primarily with components of the amono acid fraction. Technetium-99 was found to be uncomplexed and transported as the pertechnetate ion. It was not possible to duplicate fully complexes formed in vivo by back reaction with whole exudates or class fractions, indicating the possible importance of plant induction processes, reaction kinetics and/or the formation of mixed ligand complexes. 28 refs., 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1985,
month = 4
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Functional groups of lignins, fulvic and humic acids can be quantitatively characterized by derivatization with C-14-radio-labeled compounds. Utilizing this information, selected functional groups can be blocked off via specific chemical reactions. The comparison of partially blocked and unblocked humic materials using capillary electrophoresis, thermochromatography, pyrolysis gas chromatography and IR spectroscopy yields information of the compounds` functionality and structure. The complexation behavior of these well characterized materials with uranium is investigated by laser-induced fluorescence spectroscopy. The novel laser system is very user-friendly because it uses a parametric oscillator instead of the commonly used dyes. Peak deconvolution allows the determination of themore » species` characteristic fluorescence lines and the life times. First results will be given for complexation constants of the system uranium/lignins/humic acids.« less
  • Simplified surface complexation models, based on a uniform set of model parameters have been developed to address complex radionuclide sorption behavior. Existing data have been examined, and interpreted using numerical nonlinear least-squares optimization techniques to determine the necessary binding constants. Simplified modeling approaches have generally proven successful at simulating and predicting radionuclide sorption on (hydr)oxides and aluminosilicates over a wide range of physical and chemical conditions.
  • This paper presents the results of a literature survey that examined radionuclide emissions from coal-fired power plants. Literature references from both the US and foreign countries are presented. Emphasis is placed on references from the US because the radionuclide emissions from coal-fired power plants are related to radionuclide concentrations in the coal, which vary widely throughout the world. The radionuclides were identified and quantified for various existing power plants reported in the literature. Applicable radionuclide emissions criteria discovered in the literature search were then applied to a proposed circulating fluidized bed boiler power plant. Based upon the derived radionuclide emissionmore » rates applied to the proposed power plant, an air quality modeling analysis was performed. The estimated ambient concentrations were compared to the most relevant existing regulatory ambient levels for radionuclides.« less
  • In the framework of a CEC-research program in radiation protection, the uptake and subsequent translocation of radionuclides in potato plants is studied. Results from these studies will be used to further refine computational models applied in calculating doses and in decision making after a potential nuclear fallout. Potatoes are an important staple food crop in western European countries. Foliar absorption of radionuclides plays a major role for the contamination of agricultural products during the first vegetation period after a nuclear fallout. This study aims at investigating the influence of the time-point of contamination on crop radionuclide content. Three groups ofmore » potato plants were of contaminated with an aqueous solution {sup 134}CsCl at three different time-points: Group A: First leaves were fully developed. Group B: Immediately before onset of flowering (4 weeks after group A). Group C: Onset of senescence (8 weeks after group A). Plants were harvested 7, 14, 21, and 28 days after each contamination, and after full tuber development. The distribution of {sup 134}Cs within the plants was studied in three compartments: contaminated part, newly grown part, and subterranean part (roots and tubers). A steady translocation of {sup 134}CS from the contaminated parts into the other parts of the plants was observed in all three groups. The highest radionuclide content of the crop was observed in group B, i.e. in fully developed plants: 58 {+-} 3% (n = 4) of the originally applied radioactivity was found in the tubers. This experiment clearly identified the beginning of tuber formation to be the most critical time for a foliar contamination. These results serve as an important experimental verification of parameters used in computational radioecological models of radionuclide transport through the biosphere.« less
  • To provide the NRC with an actual data base of residual radionuclide measurements within nuclear power plants, Pacific Northwest Laboratory (PNL) has conducted a comprehensive sampling and analysis program at seven nuclear power plants. The objectives of these studies are to: (1) provide information on the range of composition, quantities, and locations of radionuclide residues likely to be encountered in retired reactor power stations (exclusive of the neutron activated portions of the reactor pressure vessel) and in the immediate station environs; (2) identify the origin of the radionuclide contamination, and correlate observed radionuclide inventories with reactor operating histories and procedures;more » (3) develop, to the degree possible, predictive capabilities to permit generic assessments of residual radionuclide contamination in nuclear power plants; and (4) provide a data base for use in formulating policies and strategies for decommissioning retired nuclear power plants. The nuclear power stations which have been studied include four boiling water reactors (BWR) and three pressurized water reactors (PWR).« less