Toxiciteitsmetingen m.b.v. de Microtox-methode aan oppervlaktewater en oppervlaktewaterconcentraten van de Maas in 1993
de Zwart D Polman HJG
de Zwart D
Polman HJG
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Series / Report no.
Open Access
Type
Report
Language
nl
Date of publication
1994-06-30
Year of publication
Research Projects
Organizational Units
Journal Issue
Title
Toxiciteitsmetingen m.b.v. de Microtox-methode aan oppervlaktewater en oppervlaktewaterconcentraten van de Maas in 1993
Translated Title
[Microtox toxicity of water and concentrates from the River Meuse in 1993.]
Published in
Abstract
This report presents the results of a bimonthly evaluation of the organic toxicity contained in water of the rivers Rhine (3 stations) and Meuse (8 stations) in 1993. The toxicity of untreated water samples as well as selectively concentrated organic constituents was measured with the luminescent bacteria test, Microtox. The toxicity is expressed as the so-called pT-value (10log (EC20,t=.../100)), relating toxicity to environmental acceptability criteria. According to preformulated acceptability criteria, hardly any of the observed pT-values reflects favourable conditions. Throughout the year, the concentrated organic toxicity contained in the water of the River Meuse shows the same tendency of low toxicity at the most upstream station in France, to high toxicity around the city of Liege in Belgium, generally followed by a slight and gradual decrease of toxicity in the downstream Dutch stretch of the river. In the untreated water samples, only one (June, Eijseden, NL) demonstrated a quantifiable toxicity producing 20% reduction of the bacterial luminescence when the sample was diluted to about 20%. The toxicity as observed in water of the River Meuse is of the same order of magnitude as the toxicity observed in Rhine water.<br>
Description
Publisher
Rijksinstituut voor Volksgezondheid en Milieu RIVM
Sponsors
RIVM