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Molecules 2012, 17(5), 6046-6055; doi:10.3390/molecules17056046

Effect of Soluble Sulfide on the Activity of Luminescent Bacteria

1,* , 2
Received: 23 February 2012 / Revised: 11 May 2012 / Accepted: 14 May 2012 / Published: 21 May 2012
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Sulfide is an important water pollutant widely found in industrial waste water that has attracted much attention. S2−, as a weak acidic anion, is easy hydrolyzed to HS and H2S in aqueous solution. In this study, biological tests were performed to establish the toxicity of sulfide solutions on luminescent bacteria. Considering the sulfide solution was contained three substances—S2−, HS and H2S—the toxicity test was performed at different pH values to investigate which form of sulfide increased light emission and which reduced light emission. It was shown that the EC50 values were close at pH 7.4, 8.0 and 9.0 which were higher than pH 5 and 10. The light emission and sulfide concentrations displayed an inverse exponential dose-response relationship within a certain concentration range at pH 5, 6.5 and 10. The same phenomenon occurred for the high concentration of sulfide at pH 7.4, 8 and 9, in which the concentration of sulfide was HS >> H2S > S2−. An opposite hormesis-effect appeared at the low concentrations of sulfide.
Keywords: sulfide solution; light emission; inhibition ratios; EC50; hormesis-effect sulfide solution; light emission; inhibition ratios; EC50; hormesis-effect
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Shao, Y.; Wu, L.-L.; Gao, H.-W.; Wang, F. Effect of Soluble Sulfide on the Activity of Luminescent Bacteria. Molecules 2012, 17, 6046-6055.

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