Toxicity of copper and cadmium in combinations to Duckweed analyzed by the biotic ligand model

Environmental Toxicology
Ayumi Hatano, Ryo Shoji

Abstract

The biotic ligand model (BLM) of acute toxicity to aquatic organisms is based on the concept that metals binding onto biotic ligand may cause toxic effect on the organism. The BLM can take into incorporation between metal speciation and the protective effects of competing cations account. The demonstrated BLM can provide a good estimation of the amount of single metal effect under various conditions such as pH, coexistence of other non toxic cations. However, toxic metals are often found as mixture in nature. This study estimated combined toxicity of Cu and Cd examined by growth inhibition of Duckweed (Lemna paucicostata) by using single toxicity data as toxic unit (TU) derived by three types of model, BLM and two conventional models, free ion activity model (FIAM), and total metal concentration model. According to our results, single toxicity data derived by the BLM can estimate combined toxicity described as a function of TU. Particularly under the high level of heavy metals stress, BLM clearly predicted toxicity of heavy metals compared with other two models. According to numeric correlation (R(2), root mean square error), the order is BLM (R=0.83, RMSE=13.5)> total metal concentration model (R=0.41, RMSE=24.9)> FIAM (R=0.36...Continue Reading

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Citations

Mar 21, 2012·Chemosphere·Paula M C AntunesHeather D Roshon
May 4, 2011·Environmental Toxicology and Chemistry·Eun Hea JhoKyoungphile Nam
Oct 17, 2014·Environmental Toxicology and Chemistry·Edward Tipping, Stephen Lofts
Oct 18, 2014·Environmental Toxicology and Chemistry·Yuichi IwasakiWataru Naito
Oct 30, 2014·Environmental Toxicology and Chemistry·Joseph S MeyerEmily R Garman
Jan 24, 2015·Environmental Toxicology and Chemistry·Charlotte NysKarel A C De Schamphelaere
Nov 18, 2008·Environmental Pollution·Nimisha Singh, Andrew Turner
Sep 23, 2020·Ecotoxicology and Environmental Safety·Xuedong WangRavi Naidu

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