脱氮硫杆菌的筛选及其对锶离子的矿化作用

Isolation and Strontium Mineralization of Thiobacillus Denitrificans

放射性污染日益严重,其中锶污染作为土壤典型污染之一成为研究热点。土壤中存在着一些矿化菌,能够对锶离子进行矿化固定。本实验对从土壤中分离的3株脱氮硫杆菌的特性及其对Sr^(2+)的矿化行为进行了研究,发现该菌对1.0g/L模拟Sr^(2+)污染的去除率可达80%。扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)等结果显示,矿化产物为硫酸锶。可见,利用脱氮硫杆菌治理土壤中Sr^(2+)污染具有可行性,该方法将会有一定应用前景。

Radioactive pollution is increasingly serious,and strontium contamination is a research hot point as one of the typical radioactive pollution.There are some mineralization bacteria in soil which can immobilize the heavy metal ion in the soil.3strains was isolated from soil and its characterization and mineralization to Sr^2＋was carried on.Results show that the removal rate of strains to 1.0g/L simulated Sr^2＋is up to 80%.Scanning electron microscope（SEM）,energy spectrum analysis（EDS）,X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR）results show that mineral products is strontium sulfate.This study demonstrate that using Thiobacillus denitrificans for Sr^2＋pollution removal in the soil is feasible,and the method will have some application prospect.