Coupled Kinetics Model for Microbially Mediated Arsenic Reduction and Adsorption/Desorption on Iron Oxides: Role of Arsenic Desorption Induced by Microbes,Environmental Science & Technology

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Coupled Kinetics Model for Microbially Mediated Arsenic Reduction and Adsorption/Desorption on Iron Oxides: Role of Arsenic Desorption Induced by Microbes
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-06-27 , DOI: 10.1021/acs.est.9b00109
Jingyi Lin _{1,

2} , Shiwen Hu _{1,

2} , Tongxu Liu ₃ , Fangbai Li ₃ , Lanfang Peng _{1,

2} , Zhang Lin _{1,

2} , Zhi Dang _{1,

2} , Chongxuan Liu ₄ , Zhenqing Shi _{1,

2}

Affiliation

The dynamic behavior of arsenic (As) species is closely associated with iron mineral dissolution/transformation in the environment. Bacterially induced As(V) desorption from iron oxides may be another important process that facilitates As(V) release from iron oxides without significant reductive dissolution of iron oxides. Under the impact of bacterially induced desorption, As kinetic behavior is controlled by both the microbial reduction of As(V) and the As(III)&As(V) reactions on iron oxide surfaces. However, there is still a lack of quantitative understanding on the coupled kinetics of these processes in complex systems. We developed a quantitative model that integrated the time-dependent microbial reduction of As(V) with nonlinear As(III)&As(V) adsorption/desorption kinetics on iron oxides under the impact of bacterially induced As(V) desorption. We collected and modeled literature data from 11 representative studies, in which microbial reduction reactions occurred with minimal iron oxide dissolution/transformation. Our model highlighted the significance of microbially induced As(V) desorption and time-dependent changes of microbial reduction rates. The model can quantitatively assess the roles and the coupling of individual reactions in controlling the overall reaction rates. It provided a basis for developing comprehensive models for As cycling in the environment by coupling with other chemical, physical, and microbial processes.

中文翻译：

微生物介导的砷在铁氧化物上的还原和吸附/解吸的耦合动力学模型：微生物诱导的砷解吸的作用

砷（As）物种的动态行为与环境中铁矿物质的溶解/转化密切相关。细菌从氧化铁中解吸的As（V）可能是另一个重要的过程，可促进As（V）从氧化铁中释放出来，而不会明显还原氧化铁。在细菌引起的解吸作用下，As动力学行为受微生物在氧化铁表面上的As（V）的还原和As（III）＆As（V）反应的控制。但是，对于复杂系统中这些过程的耦合动力学仍然缺乏定量的理解。我们开发了一个定量模型，将As（V）随时间变化的微生物还原与非线性As（III）和在细菌诱导的As（V）解吸的影响下，As（V）在氧化铁上的吸附/解吸动力学。我们从11项代表性研究中收集并建模了文献数据，其中微生物还原反应发生的氧化铁溶解/转化最少。我们的模型强调了微生物诱导的As（V）解吸和微生物还原速率随时间变化的重要性。该模型可以定量评估各个反应在控制总体反应速率中的作用和耦合。它通过与其他化学，物理和微生物过程相结合，为开发环境中砷循环的综合模型提供了基础。其中微生物还原反应发生，氧化铁溶解/转化最小。我们的模型强调了微生物诱导的As（V）解吸和微生物还原速率随时间变化的重要性。该模型可以定量评估各个反应在控制总体反应速率中的作用和耦合。它通过与其他化学，物理和微生物过程相结合，为开发环境中砷循环的综合模型提供了基础。其中微生物还原反应发生，氧化铁溶解/转化最小。我们的模型强调了微生物诱导的As（V）解吸和微生物还原速率随时间变化的重要性。该模型可以定量评估各个反应在控制总体反应速率中的作用和耦合。它通过与其他化学，物理和微生物过程相结合，为开发环境中砷循环的综合模型提供了基础。

更新日期：2019-06-29

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