Abstract：
:A biotic ligand model (BLM) was developed to predict nickel toxicity, affecting root growth of barley (Hordeum vulgare), in nutrient solutions. The extent to which Ca(2+), Mg(2+), Na(+), K(+) ions and pH each influenced nickel toxicity was determined. Higher activities of Mg(2+) linearly increased the 4d EC50 Ni (2+) , while Ca(2+), Na(+), K(+) and H(+) activities did not significantly influence Ni(2+) toxicity. Stability constants for the binding of Ni(2+) and Mg(2+) to the biotic ligand were obtained: logK(NiBL)=5.27 and logK(MgBL)=3.47. Further, it was calculated that on average 57% of the biotic ligand sites needed to be occupied by nickel to induce 50% root growth inhibition. Auto-validation of the BLM indicated that predicted EC50s differed from the observed EC50s by a factor of less than 2, indicating that the BLM concept may also be used to predict metal toxicity to terrestrial plants.
journal_name
Chemospherejournal_title
Chemosphereauthors
Lock K,Van Eeckhout H,De Schamphelaere KA,Criel P,Janssen CRdoi
10.1016/j.chemosphere.2006.07.008subject
Has Abstractpub_date
2007-01-01 00:00:00pages
1346-52issue
7eissn
0045-6535issn
1879-1298pii
S0045-6535(06)00863-0journal_volume
66pub_type
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