Epithermal Neutron Activation Analysis of Cr(VI)-Reducer Basalt-Inhabiting Bacteria
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- 作者：Nelly Yasonovna Tsibakhashvili ; Marina Vladimirovna Frontasyeva ; Elena Ivanovna Kirkesali ; Nadezhda Gennadievna Aksenova ; Tamaz Levanovich Kalabegishvili ; Ivana Georgievich Murusidze ; Ligury Mikhailov
- 刊名：Analytical Chemistry
- 出版年：2006
- 出版时间：September 15, 2006
- 年：2006
- 卷：78
- 期：18
- 页码：6285 - 6290
- 全文大小：137K
- 年卷期：v.78,no.18(September 15, 2006)
- ISSN：1520-6882
文摘
Epithermal neutron activation analysis (ENAA) has beenapplied to study elemental composition of Cr(VI)-reducerbacteria isolated from polluted basalts from the Republicof Georgia. Cr(VI)-reducing ability of the bacteria wasexamined by electron spin resonance, demonstrating thatthe bacteria differ in their rates of Cr(VI) reduction. A well-pronounced correlation between the ability of the bacteriato accumulate Cr(V) and their ability to reduce Cr(V) toCr(III) observed in our experiments is discussed. Elemental analysis of these bacteria also revealed thatbasalt-inhabiting bacteria are distinguished by relativecontents of essential elements such as K, Na, Mg, Fe, Mn,Zn, and Co. A high rate of Cr(III) formation correlates witha high concentration of Co in the bacterium. ENAAdetected some similarity in the elemental composition ofthe bacteria. The relatively high contents of Fe detectedin the bacteria (140-340 
g/g of dry weight) indicatebacterial adaptation to the environmental conditions typical of the basalts. The concentrations of at least 12-19different elements were determined in each type ofbacteria simultaneously starting with the major to ultratrace elements. The range of concentrations spans over8 orders of magnitude.
g/g of dry weight) indicatebacterial adaptation to the environmental conditions typical of the basalts. The concentrations of at least 12-19different elements were determined in each type ofbacteria simultaneously starting with the major to ultratrace elements. The range of concentrations spans over8 orders of magnitude.