2005
DOI: 10.1021/es048534d
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Desorption Kinetics of Cd, Zn, and Ni Measured in Soils by DGT

Abstract: DGT (diffusive gradients in thin films) was used to measure the distribution and rates of exchange of Zn, Cd, and Ni between solid phase and solution in five different soils. Soil texture ranged from sandy loam to clay, pH ranged from 4.9 to 7.1, and organic carbon content ranged from 0.8% to 5.8%. DGT devices continuously remove metal to a Chelex gel layer after passage through a well-defined diffusion layer. The magnitude of the induced remobilization flux from the solid phase is related to the pool size of … Show more

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Cited by 163 publications
(105 citation statements)
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“…Acid soils have relatively high soil solution metal concentrations but small pool sizes of metals in the solid phase, and this leads to large disturbance induced by removal of metals to the DGT. The long response time in acid soils and short response times in calcareous soils are consistent with previous studies (Zhang et al, 2006;Ernstberger et al, 2005). After repeated phytoextraction the response time of Zn and Cd in all soils changed markedly and showed large decreases in the acid soils but there were clear increases in the calcareous soils (Fig.…”
Section: Metal Desorption Kinetics Based On the Difs Modelsupporting
confidence: 91%
See 1 more Smart Citation
“…Acid soils have relatively high soil solution metal concentrations but small pool sizes of metals in the solid phase, and this leads to large disturbance induced by removal of metals to the DGT. The long response time in acid soils and short response times in calcareous soils are consistent with previous studies (Zhang et al, 2006;Ernstberger et al, 2005). After repeated phytoextraction the response time of Zn and Cd in all soils changed markedly and showed large decreases in the acid soils but there were clear increases in the calcareous soils (Fig.…”
Section: Metal Desorption Kinetics Based On the Difs Modelsupporting
confidence: 91%
“…The kinetic information can be obtained by the model of DGT induced fluxes in soils (DIFS). The DIFS model has been used to study the metal desorption kinetics of contaminated soils (Ernstberger et al, 2005;Zhang et al, 2006) and changes in metal desorption kinetics induced by hyperaccumulators (Fitz et al, 2003). In the present study the changes in soil metal desorption kinetics during the repeated phytoextraction of four metal-contaminated soils with contrasting soil properties were investigated using the DIFS model.…”
Section: Introductionmentioning
confidence: 99%
“…The DGT technique was used in this way to estimate the K d and sorption kinetics for Cd, Zn and Ni. [67,70,71] Note the parallel with the use of the DGT technique to measure dissociation kinetics of complexes in solution (see above). The ratio of c DGT to total concentration in solution, R, has been used to estimate the dissociation rates of complexes in solution, a low R value pointing to slow dissociation kinetics.…”
Section: The Dgt Techniquementioning
confidence: 99%
“…R value (ratio of CDGT to Csol) reflects the resupply potential of an element to the soil solution, providing an additional measure of the ability of a soil to maintain the CDGT flux [43]. Comparison of the soil R values (0.06-0.09) from this study with those for other metals (Cd, Zn, Ni and As), encompassing a wide range of soil types [54][55][56][57], shows that typically W resupply is relatively poorly sustained. This is further supported by the high (>90%) non-available residual fraction of W observed in acidic and neutral soils [10,18,58].…”
Section: Measurement Of W In Soils Using Pz Pf and Sf Dgt'smentioning
confidence: 98%