摘要
为研究细菌促进碳酸盐矿物形成的机理,在B4培养基中对一株分离自土壤的赖氨酸芽孢杆菌GW-2菌株进行了为期40 d的培养实验,同时完成了一组加灭活菌的对照实验.在实验过程中,对培养液中的细菌数量、pH、Ca~(2+)浓度、沉淀物重量等进行测定.用X-射线衍射仪(X-ray diffraction,XRD)对矿物种类进行测定,用扫描电子显微镜(Scanning Electron Microscopy,SEM)对矿物形态进行观察.实验结果表明:(1)GW-2菌株具有促进碳酸盐矿物生成的能力,且随着培养时间的延长,沉淀物的重量逐渐增加;(2)GW-2菌株诱导下形成的矿物经历方解石→方解石+球霰石的转化;(3)矿物形态主要为由三角板片构成的碗状和由花瓣状构成的半球.
In order to understand the formation mechanism of carbonate minerals mediated by bacteria,culture experiments with a duration of 40 days were performed under the mediation of sinibacillus sp.(strain GW-2)isolated from soils using B4 medium. At the same time,the same medium with autoclaved bacteria was done as the control. During the cultivation,bacterial density,pH value,calcium concentration,precipitate quantities were measured. X-ray diffraction(XRD)was used to determine mineral species,and scanning electron microscopy(SEM)was used to observe mineral morphologies. The results were as follows:(1)Strain GW-2 could induce the precipitation of carbonate minerals,the quantities of carbonate gradually increased with incubation time.(2)The minerals induced by strain GW-2 experienced from calcite to calcite and vaterite with culture time.(3)The morphologies were almost bowl-shaped with a lot of triangle on their surface and hemisphere with petaline shape.
引文
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