HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Web of Science (6) Citing Articles via Google Scholar Google Scholar Articles by Lehto, N. J. Articles by Tych, W. Search for Related Content PubMed PubMed Citation Articles by Lehto, N. J. Articles by Tych, W. Agricola Articles by Lehto, N. J. Articles by Tych, W. Related Collections Soil Kinetics Plant and Soil Interactions Heavy Metals

Theoretical Comparison of How Soil Processes Affect Uptake of Metals by Diffusive Gradients in Thinfilms and Plants

Environmental Science Department, Lancaster University, Bailrigg, Lancaster, LA1 4YQ

View larger version (18K): [in a new window]   Fig. 1. Components of the dynamic model of a DGT soil system, (a) DIFS and (b) dynamic plant-soil system.

View larger version (20K): [in a new window]   Fig. 2. Total zinc uptake by DGT (g = 0.293 cm and 0.1 cm) compared to Thlaspi arvense and Thlaspi caerulescens, when a high rate of water ingress (10–5 cm s–1) into the root is present, at different initial soil solution concentrations (mol cm–3).

View larger version (12K): [in a new window]   Fig. 3. Dependence of mass per unit area accumulated by DGT in 24 h on diffusion layer thickness. Diffusion layer thicknesses are shown that correspond to the flux deduced from Michaelis-Menten parameters for Zn accumulated by: Thlaspi arvense (shown by the dotted line) and Thlaspi caerulescens (shown by the solid line) (Lasat et al., 1996).

View larger version (9K): [in a new window]   Fig. 4. The change in solution phase Zn concentrations with distance from the DGT device after a 24 h deployment for devices with diffusion layer thicknesses that mimic uptake by T. arvense and T. caerulescens (initial equilibrium concentration of 0.1 nmol cm–3).

View larger version (13K): [in a new window]   Fig. 5. Modeled effect of changing the soil response time on the amount of Zn accumulated by DGT in a 24 h deployment time (diffusion layer thickness of 0.1 cm).

View larger version (17K): [in a new window]   Fig. 6. Effect of solid phase reservoir size, as expressed by Kd, and soil response time, Tc, on concentration of (a) metal in solution and (b) metal in solid phase with distance in the soil. The simulation is for a 24 h deployment time where the diffusion layer is 0.04 cm thick.