Parameterization and regionalization of Cd sorption characteristics of sandy soils. I. Freundlich type parameters

verfasst von

Günther Springob, Jürgen Böttcher

Abstract

Cd sorption isotherms (n = 24) were established for arable, sandy-soils of the 'Fuhrberger Feld' catchment area northeast of Hannover (Germany) using 0.01 M_c Ca(NO₃)₂ solution with Cd additions ranging from 0 to 44 μM_c Cd. Alternative fractions of initially (prior to analysis) sorbed Cd (S₀) were added to the amount sorbed during the experiments. The Freundlich equation was fitted to the resulting isotherms. The obtained retention parameters k and M varied with respect to the different S₀ fractions. Isotherms corrected with Cd_EDTA as S₀ fraction were nonlinear in their log-form. The highest degree of log-linearity is obtained if S₀ is characterized by 40% of the aqua regia extractable Cd. The corresponding k values ranged from 36 to 1275 g^1-M L^M kg^-1 (mean 338 g^1-M L^M kg^-1, cv = 92%). The Freundlich exponent M showed less variation (0.7 to 1.1, cv = 12%) with a mean of 0.88. Functions based on these parameters predicted Cd concentrations in Ca(NO₃)₂-soil suspensions well (r² = 0.96) but were hardly related to Cd concentrations of 'fresh' soil solutions (r² = 0.20).

Organisationseinheit(en)

Institut für Bodenkunde
AG Bodenbiophysik

Typ

Artikel

Journal

Journal of Plant Nutrition and Soil Science

Band

161

Seiten

681-687

Anzahl der Seiten

7

ISSN

1436-8730

Publikationsdatum

1998

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Bodenkunde, Pflanzenkunde

Elektronische Version(en)

https://doi.org/10.1002/jpln.1998.3581610612 (Zugang: Unbekannt)