Ecotoxicological services


We carry out standardized and specialized tests concerning biodegradability, toxicity and bioaccumulation of chemical substances, products and complex mixtures including waste water.

Biodegradability
The biodegradability of chemical substances is examined by use of various methods dependent on the purpose of the investigation, e.g. ready, inherent or anaerobic biodegradability and biodegradability in seawater. Apart from these standardized tests, specific tests are performed with e.g. the aim of determining the biodegradability under environmentally realistic conditions by use of low concentrations of the test substance (simulation tests).

Toxicity tests
In toxicity tests, the acute or chronic effects on selected species of aquatic and terrestrial plants and animals are investigated in accordance with international standardized test methods, e.g.:

Microorganisms

  • Microtox (Vibrio fisheri)
  • Sludge, inhibition of respiration
  • Inhibition of nitrification

Plants

  • Algal growth inhibition: Skeletonema, Pseudokirchneriella (the former Selenastrum), Desmodesmus, Microcystis
  • Seed germination: Lactuca
  • Higher plants: Duck weed (Lemna)

Animals

  • Crustaceans: Acartia, Daphnia, Americamysis
  • Sediment-living crustaceans: Corophium, Nitocra
  • Worms: Dinophilus
  • Fish: Zebra fish, rainbow trout, cod, herring, turbot, fathead and sheepshead minnow
  • Soil-living invertebrates: Spring-tails, enchytraeids and earth-worms
  • Bivalves: Crassostrea, Ostrea
  • Echinoderm: Strongylocentrotus

Bioaccumulation
The ability of an organic substance to bioaccumulate depends on the lipophilic properties of the substance. Bioaccumulation is measured indirectly by use of the HPLC method for log POW or directly by means of bioconcentration in fish or crustaceans.

Ecotoxicological test methods
We regularly participate in the development and standardization of new test methods (e.g. OECD and ISO methods) and thus also in international ring tests.

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DHI Laboratory

lab-dk@dhigroup.com