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Speciation of potentially mobile Si in Yangtze Estuary surface sediments: estimates using a modified sequential extraction technique

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Abstract

To improve our understanding of the Si-related biogeochemical processes that occur in estuarine ecosystems with large subaqueous deltas (e.g., the Yangtze Estuary; YE), the speciation of Si in the surface sediments of the YE was investigated. The relationships between the different Si species and sediment bulk parameters were also discussed. Based on modified sequential extraction method, we can successfully estimate the following five sedimentary potentially mobile Si pools: weak acid leachable Si (W-Si); Si bound to organic matter (H-Si); Si coprecipitated with amorphous Fe/Al oxides (O-Si); Si coprecipitated with crystalline Fe/Al oxides (Ouv-Si), and biogenic silica (B-Si). The total potentially mobile Si pool (T-Si) ranged between 1689.31 and 5487.10 μg/g, with high values observed in deltaic mud deposits. The Si fractions were closely correlated with grain size compositions, except for O-Si. In deltaic mud deposits, efficient loss of organic matters and recycling of Fe oxides probably resulted in the amorphous or poorly crystalline Fe oxides uncoupled with the clay fractions, and thus leading to the lack of correlation between O-Si and grain size. As compared with Ouv-Si, the O-Si should possess stronger mobility, which highlights the importance of quantifying the O-Si pool in deltaic sediments.

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Acknowledgments

The authors would like to acknowledge the National Science Funds for Creative Research Groups of China (No.51421006), the Program for Changjiang Scholars and Innovative Research Team in University (No.IRT13061), the National Science Fund for Distinguished Young Scholars (No.51225901), the Key Program of National Natural Science Foundation of China (No.41430751), the National Natural Science Foundation of China (No.51479065), the Fundamental Research Funds for the Central Universities (No. 2015B25314), and PAPD.

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  1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China

    Huagang Zhu, Chao Wang, Peifang Wang, Jun Hou, Jin Qian, Yanhui Ao & Cui Liu

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  1. Huagang Zhu
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  2. Chao Wang
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  3. Peifang Wang
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  6. Yanhui Ao
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  7. Cui Liu
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Correspondence to Peifang Wang.

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Figure S1

Relationship between specific surface area (SSA; m2/g) and total organic carbon (TOC)/SSA (mg/m2) in the surface sediments of the Yangtze Estuary. Figure S2 Differences between the biogenic silica contents (μg/g) determined in the present study and those determined using a two-step mild acid–mild alkaline extraction procedure (Wang et al., 2015). (DOCX 141 kb)

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Zhu, H., Wang, C., Wang, P. et al. Speciation of potentially mobile Si in Yangtze Estuary surface sediments: estimates using a modified sequential extraction technique. Environ Sci Pollut Res 23, 18928–18941 (2016). https://doi.org/10.1007/s11356-016-6944-2

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