Effect of bacterial siderophore on cesium dissolution from biotite
Effect of bacterial siderophore on cesium dissolution from biotite
复制标题
细菌铁载体对黑云母中铯溶解的影响
DOI：
10.1016/j.chemosphere.2021.130121
复制
发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Yoneda Minoru
中科院分区：
文献类型：
--
作者：
Kimura Tatsuki;Fukutani Satoshi;Ikegami Maiko;Sakamoto Fuminori;Kozai Naofumi;Grambow Bernd;Yoneda Minoru
在这项研究中，铯（Cs）的黑云母吸附和溶解的Cs轴承黑云母使用铁载体的目的是有助于阐明放射性铯在土壤环境中的迁移机制进行了研究。因此，从假单胞菌的培养基中提取并纯化了铁载体，并将纯化的铁载体用于黑云母样品的五个连续溶解实验。在溶解实验之前，Cs被吸附在几乎不风化的黑云母粉末样品上。黑云母的主要成分（铝，铁，镁）溶解几乎化学计量，强烈表明铁载体选择性地溶解黑云母的破碎边缘。溶解Cs的量随着溶解实验重复次数的增加而减少。因此，当铁载体溶解断裂边缘时，吸附在断裂边缘上的Cs快速溶解，然后，吸附在黑云母颗粒的外平坦表面上的Cs缓慢溶解，因为铁载体不直接溶解黑云母的外平坦表面，而是溶解表面边缘。
In this study, the adsorption of cesium (Cs) on biotite and dissolution of Cs from Cs-bearing biotite using a siderophore were investigated aiming to contribute to the elucidation of radiocesium migration mechanisms in the soil environment. Thus, a siderophore was extracted and purified from the culture medium ofPseudomonassp., and the purified siderophore was used in five consecutive dissolution experiments of biotite samples. Prior to the dissolution experiments, Cs was adsorbed on a hardly weathered biotite powder sample. The major components of the biotite (Al, Fe, and Mg) were dissolved almost stoichiometrically, strongly suggesting that the siderophore selectively dissolves the broken edges of the biotite. The amount of the dissolved Cs decreased by increasing the repetition times of the dissolution experiment. Therefore, the Cs adsorbed on the broken edges was dissolved rapidly as the siderophore dissolved the broken edges, and then, the Cs adsorbed on the outer planar surface of the biotite particles was slowly dissolved because the siderophore did not directly dissolve the outer planar surface of the biotite but dissolved the surface edge.