| 硅酸盐细菌对磷矿石风化作用机理的探讨 |
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| 引用本文： | 谌书.硅酸盐细菌对磷矿石风化作用机理的探讨[J].安徽农业科学,2008,36(33). |
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| 作者姓名： | 谌书 |
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| 作者单位： | 固体废物处理与资源化省部共建教育部重点实验室(西南科技大学),四川绵阳,621010;中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳,550002 |
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| 基金项目： | 国家重点基础研究发展计划项目
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中国科学院重要方向重大项目
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| 摘 要： | 目的]以1株硅酸盐细菌为例研究微生物对磷矿石的风化作用。方法]在装有100目磷矿石粉的液体培养基中接种硅酸盐细菌,按不同时间取样处理后,用原子吸收光谱仪测定培养液上清液中Ca2+的质量浓度,磷钼比色法测定水溶性磷(DP)的质量浓度;细菌作用后的残留物用电子探针、透射电镜和能谱仪进行分析。结果]结果表明,硅酸盐细菌对磷矿石粉风化后,培养液中Ca2+和DP的质量浓度随作用时间延长而增加,细菌作用后的矿粉颗粒浑圆,边缘模糊不清,菌体及有机物对矿物有较强的剥蚀作用。结论]经分析认为细菌对磷矿石的风化作用源自细菌生长导致的机械破坏作用、胞外分泌物的生化降解作用以及多种因素之间的协同作用。
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| 关 键 词： | 硅酸盐细菌 风化作用 磷矿石 机理 |
Discussion on the Weathering Mechanism of Silicate Bacteria on Phosphorite |
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| CHEN Shu.Discussion on the Weathering Mechanism of Silicate Bacteria on Phosphorite[J].Journal of Anhui Agricultural Sciences,2008,36(33). |
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| Authors: | CHEN Shu |
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| Abstract: | Objective] The aim of the research was to study the weathering effect of microorganism on phosphorite ore by taking a strain of silicate bacteria as an example.Method] Silicate bacteria was inoculated in the liquid culture medium loaded with 100 mesh phosphorite ore.After samples were treated for different time,the mass concentration of Ca2+ in the supernatant of culture liquid was determined by using atomic absorption spectrophotometer.And the mass concentration of dissolved phosphorus(DP) was determined by phospho-molybdenum colorimetry.The residues were analyzed by electron probe,TEM and EDS after being treated with bacteria.Result] The results indicated that the mass concentrations of Ca2+ and DP in the culture liquid increased with the prolonging of inoculation time after the withering of phosphorite ore by silicate bacteria.After withering by the bacteria,the ore powder particles were perfectly round and the edge was fuzzy after the action of bacteria.The bacteria and the organic compounds had stronger erosion action on minerals.Conclusion] Through the analysis,it was thought that the withering of bacteria on phosphorite ore was from the mechanical breakage of the bacteria growth,the bio-degradation of extracellular secretion and the synergistic action of many kinds of factors. |
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| Keywords: | Silicate bacteria Weathering Phosphorite ore Mechanism |
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