Effects of linuron on a rooted aquatic macrophyte in sediment-dosed test systems.

Autor: Burešová H; Alterra, Wageningen University and Research Centre, P.O. Box 47, 6700 AA Wageningen, The Netherlands. Helena.Buresova@vscht.cz, Crum SJ, Belgers JD, Adriaanse PI, Arts GH
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2013 Apr; Vol. 175, pp. 117-24. Date of Electronic Publication: 2013 Jan 30.
DOI: 10.1016/j.envpol.2012.12.030
Abstrakt: Effects of linuron on the sediment-rooted aquatic macrophyte Myriophyllum spicatum L. were studied in sediment-dosed test systems following a proposed guideline with extended test duration. Sediment, pore water, overlying water and macrophyte shoots were sampled weekly for chemical analyses. Linuron was stable in the sediments. Sediment and pore water concentrations were in equilibrium after 48 h. Overlying water concentrations increased over time, but did not reach equilibrium with pore water concentrations and were 100 times lower. Mass balances showed a rapid uptake of linuron by macrophyte roots. Known pathways and the compound's properties support the conclusion that Myriophyllum takes up linuron from pore water directly through the roots. Hence, effects on macrophytes in this type of sediment toxicity test should be expressed in terms of pore water concentrations. Pore water concentration is the most relevant parameter for describing effects on macrophytes.
(Copyright © 2013 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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