Reduction in labile copper in the 7-day Ceriodaphnia dubia toxicity test due to the interaction with zooplankton food

Chemosphere
J F Hauri, Alex J Horne

Abstract

Due to the increased popularity of zooplankton toxicity tests, it is important to investigate potential confounding factors. Though zooplankton food has been studied extensively to meet the nutritional needs of the zooplankton, less research has been done on whether food addition reduces the toxicity of metals in the tested sample. This investigation combines toxicity tests and metal speciation analysis to determine whether the EPA recommended food of YCT (yeast, cerophyll, and trout chow) and Pseudokirchneriella subcapitata (formerly Selenastrum capricornutum) reduces copper toxicity by decreasing the concentration of labile copper. Toxicity tests were performed with Ceriodaphnia dubia on culture water spiked with 0, 787, and 1574 nM copper with five different food levels. A Chelex-100 cation exchange resin and a graphite furnace-atomic absorption spectrophotometer were used in conjunction with the toxicity tests to measure the amount of labile copper in the culture water. At the EPA recommended food dosage, the C. dubia food has a chelating capacity of approximately 500 nM Cu. For both concentrations of spiked culture water, the toxicity to C. dubia was reduced with increasing food level, which seemed to be both from a decrea...Continue Reading

Citations

Feb 26, 2010·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Luciano Scarponi, Daniele Del Buono
Oct 16, 2007·Ecotoxicology and Environmental Safety·Suzelei Rodgher, Evaldo Luiz Gaeta Espíndola
Feb 27, 2007·Ecotoxicology and Environmental Safety·L ViganòR Pagnotta
Sep 28, 2016·Ecotoxicology·Miriam Hernández-ZamoraRosa Olivia Cañizares-Villanueva
Jul 29, 2008·Brazilian Journal of Biology = Revista Brasleira De Biologia·S Rodgher, E L G Espíndola
Jan 25, 2008·Environmental Toxicology·Ana PicadoRobert Hernan
Jun 6, 2007·Environmental Science & Technology·Brajesh DubeyGabriel Bittont

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