Geochemical distribution and forms of phosphorus in the surface sediment of Netravathi-Gurupur estuary, southwestern coast of India

Saha, Ajoy; Vijaykumar, M. E.; Das, Basanta Kumar; Samanta, Srikanta; Khan, M. Feroz; Kayal, Tania; Jana, Chayna; Chowdhury, Arnab Roy

doi:10.1016/j.marpolbul.2022.114543

Cited by 11 publications

(2 citation statements)

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“…P in sediments may signi cantly affect water quality in the river or lake systems after reducing external loads (Barik et al 2019). To assess the degree of P pollution in the study areas, the single-factor stand index (PPI) has been widely used to estimate the P pollution level and predict the ecological risk of P (Ke et al 2022, Qiu et al 2023, Saha et al 2023. Which was calculated in Eq.…”

Section: Calculation Of Phosphorus Pollution Index (Ppi)mentioning

confidence: 99%

“…P enters rivers primarily through external sources such as wastewater discharge, surface runoff, and internal loadings released from sediments (Smolders et al 2017, Xia et al 2023. Rapid urbanization is one of the key causes of in P accumulation in sediments (Saha et al 2023). In recent years, numerous techniques and strategies have been implemented globally to reduce external P loadings, address eutrophication in rivers and lakes, and signi cantly enhance water quality (Ma et al 2022, Yu et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

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Spatial dynamics of phosphorus in the natural-rural-suburban-urban river sediment continuum (Qinhuai River basin, China): Insights into concentration, fractionation, and environmental risk assessment of phosphorus

Cao,

Zhu,

Gao

et al. 2023

Preprint

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Rapid urbanisation, due to an imbalance in fitness with technological levels, has resulted in the accumulation of phosphorus (P) in river sediments, which is prone to environmental problems such as eutrophication of water bodies. However, little is known about phosphorus's geochemical composition and environmental risks in the natural-rural-suburban-urban river sediment continuum, which is an urgent need. This study investigated the concentration and fractionation of P using sequential P extraction and their influencing factors by introducing the PLS-SEM model (Partial Least Squares Structural Equation Model) along this continuum from the Qinhuai River. The results showed that the sedimentary TP concentrations and P fractions nearly increased dramatically with increasing the urbanization gradient. This spatial heterogenicity of P along a river was attributed mainly to land use patterns and sediment properties (nutrients ＞metals ＞ grain size). In addition, the highest values of TP, BAP (biologically active P) and PPI (P pollution index) were found in urban sediments among four regions, indicating a higher environmental risk of P release, which may increase the risk of eutrophication in overlying water bodies. Collectively, this work improves the understanding of the spatial dynamics of P in the natural-rural-urban river sediment continuum, highlights the need to control P pollution in urban sediments and provides a scientific basis for the future usage and disposal of P in sediments.

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