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Microcalorimetric study the toxic effect of hexavalent chromium on microbial activity of Wuhan brown sandy soil: An in vitro approach

2007; Elsevier BV; Volume: 69; Issue: 2 Linguagem: Inglês

10.1016/j.ecoenv.2007.02.005

1090-2414

Jun Yao, Lin Tian, Yanxin Wang, Atakora Djah, Fei Wang, Huilun Chen, Chunli Su, Rensheng Zhuang, Yong Zhou, Martin M. F. Choi, Emilia Bramanti,

Analytical chemistry methods development

A multi-channel thermal activity monitor was applied to study soil microbial activity in Wuhan brown sandy soil in the presence of different concentrations of hexavalent chromium (K2Cr2O7). In order to stimulate the soil microbial activity, 5.0 mg of glucose and 5.0 mg of ammonium sulfate were added to a 1.20-g soil sample under a controlled humidity of 35%. The results show that the poisonous species of K2Cr2O7 at an half inhibitory concentration (IC50) value of 4.27μgmL-1 against soil microbe, and an increase of the amount of hexavalent chromium is associated to a decrease in the microbial activity of the soil, probably due to an increase in the toxicity of hexavalent chromium, affecting strongly the life in this soil microbial environment. Our work also suggests that microcalorimetry is a fast, simple and more sensitive method that can be easily performed to study the toxicity of different species of heavy metals on microorganism compared to other biological methods.