Kinetic characterization of reactivity of iron dissolution and phosphorus release in surface sediments of the Changjiang (Yangtze)  River Estuary and the adjacent East China Sea

Xiao Li; Wang Di; Ma Weiwei; Li Wenjun; Li Tie; Zhu Maoxu

doi:10.3969/j.issn.0253-4193.2019.12.001

Volume 41 Issue 12

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Xiao Li，Wang Di，Ma Weiwei, et al. Kinetic characterization of reactivity of iron dissolution and phosphorus release in surface sediments of the Changjiang (Yangtze) River Estuary and the adjacent East China Sea[J]. Haiyang Xuebao，2019, 41(12)：1–13，doi:10.3969/j.issn.0253−4193.2019.12.001

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Kinetic characterization of reactivity of iron dissolution and phosphorus release in surface sediments of the Changjiang (Yangtze) River Estuary and the adjacent East China Sea

doi: 10.3969/j.issn.0253-4193.2019.12.001

College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2018-10-20
Rev Recd Date: 2019-12-17

Available Online: 2021-04-21

Publish Date: 2019-12-25

Abstract

Abstract

Kinetic dissolution and the reactive continuum model were combined to characterize the reactivity of iron (Fe) and phosphorus (P) in surface sediments of the Changjiang (Yangtze) River Estuary and the adjacent East China Sea. Two kinetic parameters, i.e., theoretical amounts (m₀) and apparent rate constant (k) of reactive Fe, were extracted by fitting kinetic dissolution data to the reactive continuum model. Results showed that Fe(Ⅱ) phases occurred in all surface sediments studies, which could be ascribed to rapid reduction of highly reactive organic-bound Fe(Ⅲ) flocculated/precipitated to the sediments. It is inferred that Fe(Ⅱ) occurs mainly as FeCO₃ in both the Changjiang (Yangtze )River Estuarine sediments and the adjacent East China Sea sediments. The m₀ and k values of Fe(Ⅱ) were controlled mainly by total organic carbon (TOC) contents and clay fractions. Simultaneous release of Fe(Ⅱ) and associated P (mainly exchangeable P and authigenic P) resulted in similar pattern of dissolution kinetics. Relative to P adsorbed on surfaces of Fe(Ⅱ) solid phases, coprecipitated P with Fe(Ⅱ) phases has higher m₀ but lower k. In fine-grained sediments with high TOC contents, Fe(Ⅲ) oxides have lower m₀ values but higher k in comparison with those in coarse-grained sediments with lower TOC contents, which is caused by different processes of Fe redox cycling. Overall, the dissolution reactivity of P associated with Fe(Ⅲ) phases is largely controlled by the reductive reactivity of Fe(Ⅲ) phases. Our kinetic characterization indicates that flocculation/precipitation has caused reactive Fe enrichment in the estuarine sediments, occurring mainly in a narrow zone of low salinity, but the enrichment could not be revealed by conventional Fe speciation.
- iron,
- phosphorus,
- reactivity,
- dissolution kinetics,
- flocculation,
- precipitation,
- Changjiang(Yangtze) River Estuary,
- East China Sea

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