Abstract：
:The toxicities of Cr (III) and Cr (VI) in water were evaluated using sulfur-oxidizing bacterial (SOB) bioassays both in batch and fed-batch conditions. Two days were enough for a quick buildup of SOB consortium in the master culture reactor (MCR). At concentrations up to 100 mg L(-1), Cr (III) was found to be nontoxic in both conditions, while Cr (VI) at very low concentrations (0.1-2 mg L(-1)) was very toxic to the SOB. Literature review suggested that the nontoxic nature of Cr (III) might be due to the absence of the iron uptake pathway in Acidithiobacillus caldus (the predominant bacteria in our reactors), which is required for Cr (III) uptake. The 2-h median effective concentration (EC50) values obtained for Cr (VI) in the batch and fed-batch tests were 2.7 mg L(-1) and 1.5 mg L(-1), respectively.
journal_name
Chemospherejournal_title
Chemosphereauthors
Qambrani NA,Hwang JH,Oh SEdoi
10.1016/j.chemosphere.2016.06.090subject
Has Abstractpub_date
2016-10-01 00:00:00pages
342-8eissn
0045-6535issn
1879-1298pii
S0045-6535(16)30848-7journal_volume
160pub_type
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