کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4408817 1618867 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessment of chromium-contaminated groundwater using a thiosulfate-oxidizing bacteria (TOB) biosensor
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Assessment of chromium-contaminated groundwater using a thiosulfate-oxidizing bacteria (TOB) biosensor
چکیده انگلیسی


• A biosensor is developed using thiosulfate oxidizing bacteria (TOB) for groundwater.
• Primary detection of TOB activity is with increase in electrical conductivity (EC).
• Increasing thiosulfate concentration (100–600 mg L−1) induced a lag period in EC rise.
• SOB was inhibited by 16.7–100% in the presence of Cr6+ (50–1000 μg L−1).
• Real groundwater (Cr6+ contaminated) with SOB has given EC50 of Cr6+ 78.96 μg L−1.

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 μg 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 μg Cr6+ L−1. These data demonstrate that TOB can detect less than 100 μg L−1 of Cr6+ in the groundwater and can be used as an effective bioassay for toxicity assessment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 104, June 2014, Pages 32–36
نویسندگان
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