Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 509382
Title Effects of linuron on a rooted aquatic macrophyte in sediment-dosed test systems
Author(s) Arts, G.H.P.
Source In: 7th Euro-Global summit on Toxicology & Applied Pharmacology October 24-26, 2016 Rome, Italy. - Rome : - p. 72 - 72.
Event Rome : 7th Euro-global summit on Toxicology & applied pharmacology, Rome, 2016-10-24/2016-10-26
Department(s) Alterra - Environmental risk assessment
Publication type Contribution in proceedings
Publication year 2016
Abstract Effects of linuron on the sediment-rooted aquatic macrophyte Myriophyllum spicatum L. Were studied in sediment-dosed test systems following an OECD test 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 aft er 48 h. Overlying water concentrations increased over time, but did not reach equilibrium with pore water concentrations and were 1000 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. Modeling supported the conclusions that high concentrations in the shoots could be explained by translocation of linuron by the roots to the shoots. The fluxes calculated for linuron support this interpretation.
At the experimental start, several pathways played a role, i.e. linuron fl uxes from pore water to overlying water and from pore water to roots. The flux from pore water to overlying water decreased later, while the translocation fl uxes from roots to shoots increased. Hence, eff ects on macrophytes in this type of sediment toxicity test should be expressed in terms of pore water concentrations. Sensitivity of water- and sediment-dosed test systems will be discussed in the light of compound properties.
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