Effect of Soluble Sulfide on the Activity of Luminescent Bacteria

Molecules

Ying Shao¹  Ling-Ling Wu¹  Hong-Wen Gao¹ 

[1] ¹Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 20092, China ²State Key Laboratory of Environmental Pollution and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

关键词: sulfide solution;    light emission;    inhibition ratios;    EC₅₀;    hormesis-effect;   

DOI  :  10.3390/molecules17056046

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.