Helmholtz-Zentrum Dresden-Rossendorf (HZDR) Study of the Interaction of Eu3+ with Microbiologically Induced Calcium Carbonate Precipitates using TRLFS
Helmholtz-Zentrum Dresden-Rossendorf (HZDR) Study of the Interaction of Eu3+ with Microbiologically Induced Calcium Carbonate Precipitates using TRLFS
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发表时间：
2020
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通讯作者：
E. Johnstone;S. Hofmann;A. Cherkouk;Moritz Schmidt
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作者：
E. Johnstone;S. Hofmann;A. Cherkouk;Moritz Schmidt
7利用时间分辨激光诱导荧光光谱（TRLFS）和各种物理化学技术研究了在三价铕（一种三价锕系元素的替代物）存在下，利用尿素分解菌8巴氏孢子八叠球菌（Sporosarcina pasteurii）9微生物诱导碳酸钙的生物矿化。结果表明：11尿素的细菌水解为CaCO3沉淀和Eu3+吸收提供了有利条件，但随后12尿素的水解导致了当地环境中NH4 +和pH值的升高。结晶形态的特征13生物形成的碳酸钙和相应的矿物相组成一致。一天后观察到球文石与一些方解石的形成，一周后观察到方解石与一些球文石的形成，两周后观察到纯方解石的形成。还鉴定和量化了与矿物相关的有机材料16的存在。TRLFS被用于跟踪17页1的35 ACS Paragon Plus环境环境科学与技术
7 The microbial induced biomineralization of calcium carbonate using the ureolytic bacterium 8 Sporosarcina pasteurii in the presence of trivalent europium, a substitute for trivalent actinides, 9 was investigated by time resolved laser-induced fluorescence spectroscopy (TRLFS) and a 10 variety of physicochemical techniques. Results showed that the bacterial-driven hydrolysis of 11 urea provides favorable conditions for CaCO3 precipitation and Eu 3+ uptake due to subsequent 12 increases in NH4 + and pH in the local environment. Precipitate morphologies were characteristic 13 of biogenically formed CaCO3 and consistent with the respective mineral phase compositions. 14 The formation of vaterite with some calcite was observed after one day, calcite with some 15 vaterite after one week, and pure calcite after two weeks. The presence of organic material 16 associated with the mineral was also identified and quantified. TRLFS was used to track the 17 Page 1 of 35 ACS Paragon Plus Environment Environmental Science & Technology