Toxicity Assessment Of Effluents
Author(s)
T. Tišler & J. Zagorc-Končan
Abstract
Experiences have shown that the effective control of effluent discharges has
contributed to continuous improvement of the receiving waters. An important
intrinsic property of effluent is toxicity, which should be properly evaluated to
protect the aquatic ecosystems. Previous experiences have shown that
identification of individual potentially toxic substances has many limitations.
Nowadays, an integrated strategy is used in programmes for monitoring the
quality of effluent discharges, which involves chemical determinations as well as
toxicity tests. In Slovenian regulations, acute toxicity assessment using water
fleas is a standard part of the monitoring programme for effluents discharging
into receiving streams if toxic compounds in the effluent are expected. The aim
of this study was to assess the adequacy of the daphnid acute toxicity test for
characterisation of effluents containing different hazardous chemicals. In most
cases Daphnia magna was found to be very sensitive to toxic effluents in
comparison to luminescent bacteria Vibrio fischeri, algae Desmodesmus
subspicatus and fish Danio rerio. However, in some cases, other organisms were
more sensitive than daphnids, for example algae D. subspicatus when exposed to
effluent from the chemical industry. Our results show that using a battery of test
species and endpoints results in more reliable and comprehensive quality
assessment of effluents discharging into receiving streams.
Keywords: Danio rerio, Daphnia magna, Desmodesmus subspicatus effluent
quality, monitoring programme, regulation, toxicity, Vibrio fischeri.
1 Introduction
Effluents, either from industrial or municipal sources, are very important sources
of chemicals entering aquatic ecosystems. They may contain hundreds to
Keywords
Danio rerio, Daphnia magna, Desmodesmus subspicatus effluent
quality, monitoring programme, regulation, toxicity, Vibrio fischeri.
Related Book
Other papers in this volume
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