铀
化学
微生物
电位滴定法
滴定法
生物量(生态学)
环境化学
锕系元素
放射化学
无机化学
细菌
有机化学
生态学
离子
材料科学
遗传学
冶金
生物
作者
Shunzhang Chen,Yanxia Cheng,Qian Zeng,Ting Zhu,Feize Li,Tu Lan,Yuanyou Yang,Jijun Yang,Jiali Liao,Ning Liu
出处
期刊:Radiochimica Acta
[Oldenbourg Wissenschaftsverlag]
日期:2022-09-22
标识
DOI:10.1515/ract-2022-0037
摘要
Abstract Although bioreduction induced by microorganisms has been considered to play an important role in the chemical and migration behaviors of uranium in nature, the accurate determination of tetravalent uranium reduced by microorganisms is still difficult to achieve. In this work, potentiometric titration via K 2 Cr 2 O 7 was used to quantitatively determine the microorganism reduced tetravalent uranium (U(IV)) for the first time. By evaluating the influence of microorganism substance content on the titration of U(IV), the appropriate determination range of U(IV) and biomass was confirmed, and U(IV) induced by bioreduction in three microorganisms was determined. With this method, U(IV) of more than 0.12 mg in microorganisms can be quantitatively measured with an accuracy of 2.2% and a precision of 1.3%, which has been established with the premise that the pretreatment biomass and quantity of U(IV) are in an appropriate range. Compared with the estimated values via the changes in hexavalent uranium (U(VI)) concentration in the bioreduction system, the results obtained by this method can more accurately reflect the quantity of U(IV) in microorganisms. This work can help us to better understand the bioreduction behavior of uranium in the environment.
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