Effect of pH on Arsenate and Arsenite Toxicity to Luminescent Bacteria (Vibrio fischeri)
作者： E. Fulladosa , J. C. Murat , M. Martínez , I. Villaescusa
DOI: 10.1007/S00244-003-2291-7
关键词:
摘要: Arsenic is an abundant metalloid and a dangerous pollutant when in solution under the arsenate or arsenite forms—As(V) As(III), respectively. Since its biological effects are expected to depend on oxidation state speciation, effect of pH either As(V) As(III) speciation resulting toxicity was investigated using Microtox bioassay based change light emission by luminescent bacteria Vibrio fischeri. Within 5.0–8.0 range, EC50 values for were found decrease as became basic, reflecting increase toxicity; whereas case almost unchanged within 6.0–8.0 range lowered only at 9.0. HAsO42− H2AsO3− be most toxic species. A statistical approach testing null hypothesis additive revealed antagonistic between chemical At low concentrations, regularly more than independent value. Conversely, high both chiefly pH, consequence strong influence this parameter speciation.
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