Assessment of chromium-contaminated groundwater using a thiosulfate-oxidizing bacteria (TOB) biosensor

作者：Qambrani Naveed Ahmed; Shin Beom Soo; Cho Ju Sik^*; Oh Sang Eun

来源：Chemosphere, 2014, 104: 32-36.

DOI：10.1016/j.chemosphere.2013.10.032

• Thiosulfate-oxidizing bacteria (TOB)
• Cr6+ toxicity in groundwater
• Heavy metal
• Toxicity assessment
• Sulfur oxidation

The effect of Cr6+-contaminated groundwater was assessed using thiosulfate-oxidizing bacteria (TOB). Electrical conductivity (EC), pH, and sulfate production were determined based on thiosulfate oxidation. Final pH values in the different test treatments of Cr6+-contaminated groundwater (50-1000 mu g Cr6+ L-1) ranged from 2.02 +/- 0.09 to 7.76 +/- 0.07 and EC ranged from 5.95 +/- 0.03 to 3.63 +/- 0.03 mS cm(-1). Inhibition of TOB due to Cr6+ was between 16.7% and 100%, with higher levels of inhibition occurring at higher Cr6+ concentrations. The median effective concentration (EC50) was 78.96 mu g Cr6+ L-1. These data demonstrate that TUB can detect less than 100 mu g L-1 of Cr6+ in the groundwater and can be used as an effective bio-assay for toxicity assessment.

• 出版日期2014-6