Method of diffusive gradients in thin films (DGT) compared with other soil testing methods to predict uranium phytoavailability
The measurement of diffusive gradients in thin films (DGT) has been proposed as a surrogate for metal uptake by plants. A small-scale experiment was performed to test the predictive capacity of the DGT method with respect to uranium availability and uptake by ryegrass. Correlation analysis was performed to compare the results obtained with the DGT device with more conventional bioavailability indices: concentration of uranium in pore water or in selective extractants. Six soils with different histories of uranium contamination and with distinct soil characteristics were used for the availability tests and the uptake experiment. The four uranium bioavailability indices that we screened were highly correlated, indicating that uranium pools assessed were at least partially comparable. Uranium concentration in the pore water was a better predictor for uranium uptake by ryegrass than amount of uranium recovered following extraction with 0.11M CH3COOH or 0.4 M MgCl2. The concentration measured with DGT concentration, CDGT, was also highly correlated with plant uptake. However, the significance level was sensitive to the value of the diffusion coefficient (pH dependent or not) used to calculate CDGT. From the results obtained,we could not conclude that the DGT method would have additional value in assessing uranium bioavailability.
Bioavailability DGT Soil test Uranium
H. Vandenhove K. Antunes J. Wannijin L. Duquene Y. Thiry M. Van Hees
Belgian Nuclear Research Centre, Radiation Protection Research, Laboratory of Radioecology, Boeretan Katholieke Hogeschool Kempen, Kleinboefstraat 4, 2440 Geel, Belgium
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
718-719
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）