Temporal Decrease of Trivalent Chromium Concentration in a Standardized Algal Culture Medium: Experimental Results and Implications for Toxicity Evaluation
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The fate of two trivalent chromium salts (nitrate and chloride) in ISO algal culture medium was followed over 72 h; i.e., the typical duration of algal toxicity tests. Fifty percent of the initial Cr spikes was lost from the solutions by 24 h, with losses up to 90% after 72 h. Monitoring of the temporal variability of Cr(III) concentrations in algal culture media appears necessary to better characterize the toxicity of trivalent chromium to algae.
KeywordsTrivalent chromium Algal ISO medium Chromium toxicity Chromium speciation
This research was partially supported by the Swiss National Science Foundation (grant 200020-101844). Dr. Pierre-Yves Favarger (Institut F.-A. Forel) helped with ICP-MS analysis and Sandra Levai (University of Geneva) with the search of primary literature sources.
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