Radium and uranium levels in vegetables grown using different farming management systems

Vegetables grown with phosphate fertilizer (conventional management), with bovine manure fertilization (organic management) and in a mineral nutrient solution (hydroponic) were analyzed and the concentrations of 238U, 226Ra and 228Ra in lettuce, carrots, and beans were compared. Lettuce from hydropo...

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Bibliographic Details
Published in:Journal of environmental radioactivity 2009-02, Vol.100 (2), p.176-183
Main Authors: Lauria, D.C., Ribeiro, F.C.A., Conti, C.C., Loureiro, F.A.
Format: Article
Language:English
Subjects:
Agricultural and farming systems
Agriculture
Agronomy. Soil science and plant productions
Biological and medical sciences
Daucus
Daucus carota - metabolism
Fabaceae - metabolism
Farming management
Fundamental and applied biological sciences. Psychology
General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping
General agronomy. Plant production
Generalities. Agricultural and farming systems. Agricultural development
Lactuca - metabolism
Radium
Radium - analysis
Radium - metabolism
Soil and water pollution
Soil science
Transfer factor
Uranium
Uranium - analysis
Uranium - chemistry
Vegetables - metabolism
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Summary:Vegetables grown with phosphate fertilizer (conventional management), with bovine manure fertilization (organic management) and in a mineral nutrient solution (hydroponic) were analyzed and the concentrations of 238U, 226Ra and 228Ra in lettuce, carrots, and beans were compared. Lettuce from hydroponic farming system showed the lowest concentration of radionuclides 0.51 for 226Ra, 0.55 for 228Ra and 0.24 for 238U (Bq kg −1 dry). Vegetables from organically and conventionally grown farming systems showed no differences in the concentration of radium and uranium. Relationships between uranium content in plants and exchangeable Ca and Mg in soil were found, whereas Ra in vegetables was inversely correlated to the cation exchange capacity of soil, leading to the assumption that by supplying carbonate and cations to soil, liming may cause an increase of U and a decrease of radium uptake by plants. The soil to plant transfer varied from 10 −4 to 10 −2 for 238U and from 10 −2 to 10 −1 for 228Ra.
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2008.11.006