Strontium-90 (⁹⁰Sr) is an artificial radioisotope produced by nuclear fission, with a relatively long half-life of 29 years. This radionuclide is released into the environment in the event of a nuclear incident, posing a serious risk to human and ecosystem health. There is a need to develop new efficient methods for the remediation of ⁹⁰Sr, as current techniques for its removal have significant technical limitations and involve high energy and economic costs. Recently, several species of green microalgae within the class Chlorodendrophyceae have been found to form intracellular mineral inclusions of amorphous calcium carbonate (ACC), which can be highly enriched in natural (non-radiogenic) Sr. As bioremediation techniques are an attractive option to address radioactive pollution, we investigated the capacity of the unicellular alga Tetraselmis chui (class Chlorodendrophyceae) to sequester ⁹⁰Sr. The ⁹⁰Sr uptake capacity of T. chui cells was assessed in laboratory cultures by monitoring the time course of radioactivity in the culture medium using liquid scintillation counting (LSC). T. chui was shown to effectively sequester ⁹⁰Sr, reducing the initial radioactivity of the culture medium by up to 50%. Thus, this study demonstrates the potential of the microalga T. chui to be used as a bioremediation agent against ⁹⁰Sr pollution.

中文翻译：

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绿色微藻 Tetraselmis chui 可对锶 90 污染进行生物修复

锶90（^90Sr）是一种由核裂变产生的人造放射性同位素，半衰期相对较长，为29年。发生核事故时，这种放射性核素会释放到环境中，对人类和生态系统健康构成严重风险。需要开发新的有效方法来修复⁹⁰ Sr，因为当前的去除 90 Sr 的技术具有显着的技术局限性，并且涉及高能源和经济成本。最近，人们发现绿树藻纲中的几种绿色微藻可形成无定形碳酸钙 (ACC) 的细胞内矿物内含物，这种矿物内含物富含天然（非放射性）Sr。生物修复技术是解决这一问题的一个有吸引力的选择。放射性污染，我们研究了单细胞藻类Tetraselmis chui（绿树藻纲）螯合⁹⁰ Sr的能力。通过使用液体监测培养基中放射性的时间过程，在实验室培养物中评估了T. chui细胞的⁹⁰ Sr 吸收能力闪烁计数（LSC）。T. chui被证明可以有效隔离⁹⁰ Sr，使培养基的初始放射性降低高达 50%。因此，这项研究证明了微藻T. chui作为生物修复剂对抗⁹⁰ Sr 污染的潜力。