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- W2986449579 abstract "Phosphorus (P) as an essential macronutrient, plays a crucial role in the regulation of biological productivity and biogeochemical cycling of other biogenic elements in aquatic environments. Different geochemical fractions of sedimentary P were separated and quantified using the sequential extraction (SEDEX) method to evaluate the abundance, sources, distribution, bioavailability and ecological risk of P in surface sediments of the Cross River estuary system (CRES) and adjacent shelf. Sediment grain size composition and bulk organic carbon were also determined. Total P (TP) ranged from 9.21–18.2 μmol/g (average, 13.30 ± 2.08 μmol/g), and comprised mostly of inorganic P (IP) (IP/TP = ~87%). Generally, authigenic P (Ca-P) was the dominant IP fraction (Ca-P/IP = ~37 ± 11.1%), representing an important long-term P reservoir. The range of organic carbon (OC) to organic P (OP) ratio (OC/OP) indicated the predominance of terrestrial OC, and that leachable OP (Le-OP) may be the major OP form in surface sediments of the study area. The partitioning and distribution of different sedimentary P fractions were controlled by the biogeo- and physicochemical conditions favorable for P transformation, sediment grain size composition and sources of sedimentary organic matter. The ratio (Fe/P) of the extractable Fe in citrate-dithionite-bicarbonate solution (FeCDB) to ferric oxide-bound P(Fe-P) revealed the presence of reactive Fe- matrices having strong sorption capacity for P. The contents of potential bioavailable P (BAP) (~34–60% of TP) indicated that P amount in the overlying water column may increase substantially if released from surface sediments. The Fe-P was the major component of BAP, and the relationship between BAP and extractable FeCDB highlighted the significant impact of Fe(III) (oxyhdr)oxides on P mobility and bioavailability. The estimated P enrichment index (PEI) indicated that surface sediment is less impacted by anthropogenic P and poses less ecological risk with respect to sedimentary TP load in the study area." @default.
- W2986449579 created "2019-11-22" @default.
- W2986449579 creator A5044004985 @default.
- W2986449579 creator A5057080389 @default.
- W2986449579 creator A5088462702 @default.
- W2986449579 date "2020-01-01" @default.
- W2986449579 modified "2023-10-16" @default.
- W2986449579 title "Geochemical fractionation, potential bioavailability and ecological risk of phosphorus in surface sediments of the Cross River estuary system and adjacent shelf, South East Nigeria (West Africa)" @default.
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