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Different Mercury Species Partitioning and Distribution in the Water and Sediment of a Eutrophic Estuary in Northern Taiwan
 
 
Article

Distribution of Geochemical Species of P, Fe and Mn in Surface Sediments in the Eutrophic Estuary, Northern Taiwan

Department of Marine Environmental Informatics, College of Marine Science and Resource, National Taiwan Ocean University, Keelung 202, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Ramon J. Batalla
Water 2021, 13(21), 3075; https://doi.org/10.3390/w13213075
Received: 24 September 2021 / Revised: 21 October 2021 / Accepted: 26 October 2021 / Published: 2 November 2021
(This article belongs to the Special Issue The Geochemical Behavior of Trace Elements in Inshore Environments)
The Danshuei River Estuary (DRE) in northern Taiwan is a seriously eutrophic estuary due to the domestic effluent discharge. Surface sediment samples were collected from the DRE to study the concentrations and spatial distributions of different fractions of phosphorus through the five-step sequential extraction method which chemically divides the sedimentary P into five fractions: PSORB, PCDB, PCFA, PDET, and PORG. The Fe and Mn contents in the extracted solution were also determined. The total organic carbon (TOC) and grain size in sediment samples were analyzed as well. The sedimentary total P (TP) concentrations ranged within 537–1310 mg/kg and mostly exceeded 800 mg/kg, suggesting that the DRE sediments were moderately polluted by phosphorus. The PCDB was the dominant fraction of P, averagely contributing 58% of TP, followed by PDET 31%. The contributions of the PSORB and PCFA fractions to the TP were relatively minor. Two fractions, FeCDB and FeORG, of sedimentary Fe equally shared approximately 70% of total Fe, followed by FeDET with 22%. The contribution of different fractions of sedimentary Mn followed the sequence: MnCDB (36%) > MnCFA (29%) > MnORG (14.7%) > MnDET (14.5%) > MnSORB (5.3%). The sedimentary P, Fe, and Mn within the DRE are easily mobilized because they were mainly present in the reducible fraction. The concentrations of sedimentary TP positively correlated with the TOC contents and inversely negatively correlated with grain size, suggesting that the TOC and grain size play the crucial roles in influencing the distribution of sedimentary P within the DRE. Finally, the Fe(III) (hydro)oxides seems to play an important carriers to adsorb dissolved P because PCDB positively correlated with FeCDB. View Full-Text
Keywords: phosphorus; iron; manganese; TOC; sequential extraction method phosphorus; iron; manganese; TOC; sequential extraction method
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MDPI and ACS Style

Fang, T.-H.; Wang, C.-W. Distribution of Geochemical Species of P, Fe and Mn in Surface Sediments in the Eutrophic Estuary, Northern Taiwan. Water 2021, 13, 3075. https://doi.org/10.3390/w13213075

AMA Style

Fang T-H, Wang C-W. Distribution of Geochemical Species of P, Fe and Mn in Surface Sediments in the Eutrophic Estuary, Northern Taiwan. Water. 2021; 13(21):3075. https://doi.org/10.3390/w13213075

Chicago/Turabian Style

Fang, Tien-Hsi, and Cheng-Wen Wang. 2021. "Distribution of Geochemical Species of P, Fe and Mn in Surface Sediments in the Eutrophic Estuary, Northern Taiwan" Water 13, no. 21: 3075. https://doi.org/10.3390/w13213075

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