کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4414462 1307713 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Predicting radium availability and uptake from soil properties
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Predicting radium availability and uptake from soil properties
چکیده انگلیسی

The results of a potted soil experiment to determine the soil and plant factors ruling radium availability and uptake by ryegrass and clover are described. Nine soils with distinct soil characteristics were spiked with 226Ra. They were thoroughly characterized and the solid liquid partitioning coefficient, Kd, was determined. Kd ranged from 38 l kg−1 to 446 l kg−1 (average: 188 ± 156 l kg−1) and was linearly related to cation exchange capacity (CEC) and organic matter (OM) content. The soil-to-plant transfer factor (TF) was significantly affected by the chemical properties of the soils and ranged from 0.054 kg kg−1 to 0.719 kg kg−1 for ryegrass and from 0.034 kg kg−1 to 1.494 kg kg−1 for clover. Overall, no significant difference in TF between ryegrass and clover was observed. TF was related to Kd, to CEC, OM (for ryegrass only when excluding one soil) and the calcium concentration in the soil solution (for both plants if excluding one soil).Radium flux were calculated from the radium concentration in the soil solution and the evapotranspiration, to predict total radium uptake derived from shoot radium concentration and biomass yield. It was found that radium uptake could be predicted from the radium flux (R2 = 0.61 and 0.83 for ryegrass and clover, respectively). Higher predictability (R2 = 0.70 and 0.91 for ryegrass and clover, respectively) was obtained when relating total radium uptake to a radium flow considering competition effects at the root surface by bivalent cations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 69, Issue 4, September 2007, Pages 664–674
نویسندگان
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