Zhang, Carl2020-04-172020-04-172013Zhang, J, Ding, T, Zhang C (2013), Biosorption and toxicity responses to arsenite (As[III]) in Scenedesmus quadricauda, Chemosphere, 92:1077-1084https://hdl.handle.net/10657.1/2262Toxicity and biosorption responses to arsenite (As[III]) were examined in a 96-h exposure study using Scenedesmus quadricauda, one of the most popular green algae distributed in freshwaters in China. Results indicated that the pH-dependent distribution of two arsenite species (H2AsO3(-) and H3AsO3) played an important role in biosorption and toxicity. The undissociated H3AsO3 was more toxic than its monoanionic H2AsO3(-) through comparison of algal cell numbers, chlorophyll-a contents, and algal ultrastructural changes observed with transmission electron microscopy. An effective biosorption of 89.0mgg(-1) at 100mgL(-1) As[III] was found in the treatments with an initial pH of 9.3 and 25.2μgg(-1) at 0.03mgL(-1) As[III] at an initial pH of 8.2 as a result of the predominant species of H2AsO3(-) under the ambient pH and Eh conditions. Our results imply that S. quadricauda may provide a new means for the removal of toxic arsenite species present in contaminated surface water.Adsorption Anions/chemistry Arsenic/chemistry Arsenic/toxicity Arsenites/chemistry Arsenites/toxicity Chlorophyll/metabolism Chlorophyll A Fresh Water/chemistry Hydrogen-Ion Concentration Scenedesmus/drug effects Scenedesmus/metabolism Scenedesmus/ultrastructure Spectroscopy, Fourier Transform Infrared Water Pollutants, Chemical/chemistry Water Pollutants, Chemical/toxicityArticle