Document of bibliographic reference 128628

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Toxicological availability of nickel to the benthic oligochaete Lumbriculus variegatus

Abstract

It is generally accepted that the bioavailability of metals in sediments is influenced by the presence of acid volatile sulfides (AVS). The pore water hypothesis predicts that, if the molar concentration of simultaneously extracted metals (SEM) in a sediment is smaller than the molar concentration of AVS, the free metal ion activity in the pore water is very small and that consequently no metal toxicity in short-term toxicity tests is observed. In this study we examined (1) if this concept can be extended to predict the absence of chronic Ni toxicity to the oligochaete deposit-feeding worm Lumbriculus variegatus and (2) if the organic carbon normalized excess SEM; i.e. [SEM-AVS]/f_OC predicts the magnitude of Ni toxicity to L. variegatus. A 28-day toxicity experiment was performed in which biomass production of L. variegatus was determined in two natural sediments with different [AVS] and f_OC, spiked at different Ni concentrations. The absence of toxicity is predicted correctly by the [SEM-AVS] < 0 criterion when only the 0-1 cm surface layer of the sediment is considered, but not when the whole bulk sediment is considered (0-3 cm). In both sediments, the same [SEM-AVS]/f_OC at the surface corresponds with a similar decrease in L. variegatus biomass. Thus, [SEM-AVS]/f_OC in the surface layer accurately predicts the magnitude of toxicity. This measure is therefore a good estimator of toxicologically available Ni. On the other hand, the free Nⁱ²⁺ ion activity in the overlying water appeared to be an equally good predictor of the magnitude of toxicity. Consequently, it was not possible to determine the relative importance of the overlying water and pore water exposure route with the semi-static laboratory experiments.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000248273700003

Bibliographic citation

Vandegehuchte, M.B.; Roman, Y.E.; Nguyen, L.T.H.; Janssen, C.R.; De Schamphelaere, K.A.C. (2007). Toxicological availability of nickel to the benthic oligochaete Lumbriculus variegatus. Environ. Int. 33(6): 736-742. https://dx.doi.org/10.1016/j.envint.2007.02.006

Topic

Fresh water

Is peer reviewed

true