PMID: 11931445Apr 5, 2002Paper

Combination effect of light and toxicity in algal tests

Journal of Environmental Quality
Michael CleuversHans Toni Ratte

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 dye-stuffs, the current test protocol for the algal growth inhibition test...Continue Reading

Citations

Apr 7, 2007·Bulletin of Environmental Contamination and Toxicology·M Türker Saçan, N Ozkovalak
Jul 11, 2002·Water Research·Michael Cleuvers, Hans Toni Ratte
May 20, 2003·Water Research·Michael Cleuvers, Arnd Weyers

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