Development and validation of a terrestrial biotic ligand model predicting the effect of cobalt on root growth of barley (Hordeum vulgare)

Lock, K.; De Schamphelaere, K.A.C.; Becaus, S.; Criel, P.; Van Eeckhout, H.; Janssen, C.R.

doi:/10.1016/j.envpol.2006.10.003

Development and validation of a terrestrial biotic ligand model predicting the effect of cobalt on root growth of barley (Hordeum vulgare)

Lock, K.; De Schamphelaere, K.A.C.; Becaus, S.; Criel, P.; Van Eeckhout, H.; Janssen, C.R. (2007). Development and validation of a terrestrial biotic ligand model predicting the effect of cobalt on root growth of barley (Hordeum vulgare). Environ. Pollut. 147(3): 626-633. https://dx.doi.org/10.1016/j.envpol.2006.10.003

In: Environmental Pollution. Elsevier: Barking. ISSN 0269-7491; e-ISSN 1873-6424, meer

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Trefwoorden

Bioavailability
Cobalt
Growth
Heavy metals
Models
Risk analysis
Roots
Soil pollution
Speciation
Toxicity
[WoRMS]; Hordeum vulgare L.; Spermatophyta [Zaadplanten]
Zoet water

Auteurs		Top
Lock, K., meer De Schamphelaere, K.A.C., meer Becaus, S.	Criel, P. Van Eeckhout, H., meer Janssen, C.R., meer

Abstract

A Biotic Ligand Model was developed predicting the effect of cobalt on root growth of barley (Hordeum vulgare) in nutrient solutions. The extent to which Ca²⁺, Mg²⁺, Na⁺, K⁺ ions and pH independently affect cobalt toxicity to barley was studied. With increasing activities of Mg²⁺, and to a lesser extent also K⁺, the 4-d EC50_Co²⁺ increased linearly, while Ca²⁺, Na⁺ and H⁺ activities did not affect Co²⁺ toxicity. Stability constants for the binding of Co²⁺, Mg²⁺ and K⁺ to the biotic ligand were obtained: log K_CoBL = 5.14, log K_MgBL = 3.86 and log K_KBL = 2.50. Limited validation of the model with one standard artificial soil and one standard field soil showed that the 4-d EC50_Co²⁺ could only be predicted within a factor of four from the observed values, indicating further refinement of the BLM is needed.

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