微生物矿化法固结模拟放射性核素锶的研究

Abstract

Abstract: Sr²⁺ was transformed into insoluble state to provide a reference method for dealing with radionuclide strontium. Bacillus pasteurii was cultivated with medium containing urea. Enzyme of urease was produced and urea was discomposed to CO₃^2-, which could put soluble Sr²⁺ into insoluble carbonate. The particle size and morphology of the solidifying product was characterized by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and scanning electronic microscope (SEM). Factors such as pH, temperature, inoculum concentration, incubation time, concentration of Sr²⁺and urea on solidifying rate of Sr²⁺was studied. It showed that the solidifying product was composed of aggregative globular SrCO₃crystals in unequal size. The bacillus played an important role in the precipitating process. Cultivating 48 h at 30 ℃, the solidifying rate reached a peak as about 98.5% when the concentration of Sr²⁺and urea, inoculum concentration and pH was 0.02 mol/L, 20 g/L, 6.0% and pH 8.0 respectively.

Key words: microorganism, mineralization, carbonate, radionuclide strontium

CLC Number:

TL941+.19

Xiao Xiangzhu, Zhu Wenkun, Zhang Youkui, Mu Tao, Duan Tao, Nie Xiaoqin, Luo Xuegang. Study on simulated radionuclide strontium mineralized by bacteria[J].RADIATION PROTECTION, 2015, 35(2): 65-70.

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Study on simulated radionuclide strontium mineralized by bacteria

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