Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Temporal variability of solution Cd²⁺ concentration in metal-contaminated soils as affected by soil temperature: consequences on lettuce (Lactuca sativa L.) exposure

J. Y. Cornu, L. Denaix, A. Schneider and S. Pellerin
Plant and Soil
Vol. 307, No. 1/2 (June 2008), pp. 51-65
Published by: Springer
Stable URL: http://www.jstor.org/stable/42951860
Page Count: 15
  • More info
  • Cite this Item
Temporal variability of solution Cd²⁺ concentration in metal-contaminated soils as affected by soil temperature: consequences on lettuce (Lactuca sativa L.) exposure
Preview not available

Abstract

The aim of this study was to assess how the solubility and the speciation of Cd in soil solution were affected over time by the soil temperature for three metal-contaminated soils. The changes of solution Cd concentration (either total or free ionic) and other physico-chemical parameters (e.g. pH, ionic strength, the concentrations of $NO_3^ - $, $SO_4^{2 - }$, Ca, Mg and dissolved organic carbon) were monitored over a 28-day culture of lettuce (Lactuca sativa L.) in soils incubated at 10°C, 20°C or 30°C. The major result of this study was that Cd²⁺ concentration greatly varied over time in soil solution. The Cd²⁺ concentration declined over time in soil solution as did the concentration of cations that may compete for adsorption (Ca²⁺, Mg²⁺). The rise in soil temperature primarily impacted on the concentration of Cd²⁺ via promoting the microbial C-degradation and, thus, the complexation of Cd in soil solution. The integration of the temporal variations in Cd²⁺ concentration through the calculation of the root exposure to solution Cd (ECd) provided a fairly close and robust prediction of Cd concentration in lettuce roots. The present work thus provided new insights on the fate of Cd in contaminated soils that may be relevant for predicting the root uptake of Cd.

Page Thumbnails

  • Thumbnail: Page 
[51]
    [51]
  • Thumbnail: Page 
52
    52
  • Thumbnail: Page 
53
    53
  • Thumbnail: Page 
54
    54
  • Thumbnail: Page 
55
    55
  • Thumbnail: Page 
56
    56
  • Thumbnail: Page 
57
    57
  • Thumbnail: Page 
58
    58
  • Thumbnail: Page 
59
    59
  • Thumbnail: Page 
60
    60
  • Thumbnail: Page 
61
    61
  • Thumbnail: Page 
62
    62
  • Thumbnail: Page 
63
    63
  • Thumbnail: Page 
64
    64
  • Thumbnail: Page 
65
    65