Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.2134/jeq2002.5390
Titel (primär) Combination effect of light and toxicity in algal tests
Autor Cleuvers, M.; Altenburger, R.; Ratte, H.T.
Quelle Journal of Environmental Quality
Erscheinungsjahr 2002
Department BIOTOX
Band/Volume 31
Heft 2
Seite von 539
Seite bis 547
Sprache englisch
Abstract The sensitivity of Scenedesmus subspicatus against potassium dichromate is positively correlated to the photon flux density during the algal growth inhibition test. Low photon flux densities led to significantly reduced maximum effects and higher EC50 levels. To improve the testing of colored substances, we distinguished between the toxic effect (chemical part, represented by potassium dichromate) and the shading effect (physical part, simulated by reduced light intensities during the test) of a hypothetical light absorbing substance. The contribution of these single effects to the total inhibition varied greatly. At high concentrations of potassium dichromate (1.6 and 3.2 mg L-1) the physical part never exceeded 25% of the total inhibition, not even at strongest light reduction, while at low concentrations (0.2 and 0.4 mg L-1) the physical effect became more prominent when halving the amount of available light. Further, the combination effect of the chemical and the physical effect could be calculated well only by using the concept of independent action. Thus, if chemical and physical effects are measured in combination, as is the case in tests with dyestuffs, the current test protocol for the algal growth inhibition test may lead to incorrect estimations of the toxic potential.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=5422
Cleuvers, M., Altenburger, R., Ratte, H.T. (2002):
Combination effect of light and toxicity in algal tests
J. Environ. Qual. 31 (2), 539 - 547 10.2134/jeq2002.5390