Distribution characteristics, risk assessment, and quantitative source apportionment of typical contaminants (HMs, N, P, and TOC) in river sediment under rapid urbanization: A study case of Shenzhen river, Pearl River Delta, China

Zhang, Ying; Mao, Wei; Li, Ruohan; Liu, Yang; Wang, Peng; Zheng, Zelin; Guan, Yuntao

doi:10.1016/j.psep.2022.03.032

Cited by 13 publications

(4 citation statements)

References 38 publications

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“…This study revealed the urbanization-driven spatial pattern of P fractions in the natural-rural-suburban-urban river sediment continuum along the whole river. As urbanization accelerated, large amounts of untreated industrial and urban wastewater were directly discharged into rivers (Zhang et al 2022b). Pollutants, such as nutrients (P), are transported by rivers and are readily absorbed by sediment (internal P loading), which has caused ongoing river eutrophication for decades (Ma et al 2022, Yin et al 2022, Yu et al 2017b).…”

Section: Environmental Implicationsmentioning

confidence: 99%

“…Accompanying the rapid urbanisation in China (Zhang et al 2022a), a large number of anthropogenic activities have spawned excess industrial wastewater, municipal sewage, and agricultural runoff pollution, which threaten water quality safety and human health (Bouaroudj et al 2019, Li et al 2023, Zhang et al 2022b). As one of the most critical environmental issues, river eutrophication has not been properly resolved worldwide due to the imbalance between urbanization and water ecosystem management (Dou et al 2021, Grygoruk et al 2015, Kim et al 2020).…”

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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Section: Environmental Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Heavy metal concentrations in bottom sediment have been used to indicate environmental pollution in different ecosystems, viz., rivers 20 , 21 , streams 22 , wetlands 23 – 26 , forests 27 , grasslands 28 , and marine ecosystems 29 . The heavy metal load in bottom sediments in wetlands can indicate both natural sources and human-caused activities, as industrial waste channelled through streams, rivers, and agricultural runoff 23 , 30 – 32 . Because of their tenacity and increased intensity in agriculture 7 , 33 , 34 , heavy metals accumulate in wetland soil over the years, posing threats to the environment and human well-being as they flow through the trophic levels 35 , 36 .…”

Section: Introductionmentioning

confidence: 99%

Assessment of environmental and carcinogenic health hazards from heavy metal contamination in sediments of wetlands

Panda,

Mohanta,

Paul

et al. 2023

Sci Rep

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Sediment contamination jeopardizes wetlands by harming aquatic organisms, disrupting food webs, and reducing biodiversity. Carcinogenic substances like heavy metals bioaccumulate in sediments and expose consumers to a greater risk of cancer. This study reports Pb, Cr, Cu, and Zn levels in sediments from eight wetlands in India. The Pb (51.25 ± 4.46 µg/g) and Cr (266 ± 6.95 µg/g) concentrations were highest in Hirakud, Cu (34.27 ± 2.2 µg/g) in Bhadrak, and Zn (55.45 ± 2.93 µg/g) in Koraput. The mean Pb, Cr, and Cu values in sediments exceeded the toxicity reference value. The contamination factor for Cr was the highest of the four metals studied at Hirakud (CF = 7.60) and Talcher (CF = 6.97). Furthermore, high and moderate positive correlations were observed between Cu and Zn (r = 0.77) and Pb and Cr (r = 0.36), respectively, across all sites. Cancer patients were found to be more concentrated in areas with higher concentrations of Pb and Cr, which are more carcinogenic. The link between heavy metals in wetland sediments and human cancer could be used to make policies that limit people's exposure to heavy metals and protect their health.

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“…The concentrations and spatial contribution of metals in delta soils are influenced by various factors, including soil properties, wetland types, hydrological condition, and anthropogenic activities, among others (Zhong et al, 2020;Xu et al, 2021;Mei et al, 2022). For example, a high correlation between total organic carbon (TOC) and metals was observed in soil given that TOC acts as the main contributor to exchanged or dissolved metals in the sediment (Zhang et al, 2022). Moreover, an increase in salinity has been shown to be associated with a declining trend of As and other metal concentrations (Bai et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Characteristics and influencing factors of metal distribution in different wetlands of the Liaohe Delta, Northeastern China

Zhang

Qin

et al. 2022

Front. Mar. Sci.

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Metal distribution in different wetlands under the complex influence of natural and anthropogenic activities in the Liaohe Delta was analyzed to better protect and manage delta areas. Ninety-six soil samples were collected from six wetland types, and the levels, depth distributions, risk, and influencing factors of metals (i.e., As, Cd, Cr, Ni, Cu, Pb, Zn, Mn, Al, and Fe) were analyzed. The results showed that the concentrations of As, Cd, Cr, Ni, Zn, and Al in more than 70% of the soil samples were higher than the background value of Liaoning Province. The concentration of As decreased with distance from the estuary, while that of Cr was higher downstream of Liaohe. The spatial distributions of Cd, Ni, Cu, Pb, and Zn were similar. The concentrations of most metals in the topsoil were higher than those in the subsoil. According to the Nemerow pollution index, higher pollution was observed in the area far away from the Liaohe River and Bohai Sea for the topsoil layer, while for the subsoil layers, higher pollution was observed in the area near the Liaohe estuary. The correlation analysis showed that the wetland type was clearly correlated with Cd, Cu, Al, and S. The concentrations of Cd, Pb, Zn, C, N, P, and S and the electrical conductivity obviously decreased with soil depth, while the concentration of Mn was positively correlated with soil depth. Mn was negatively correlated with total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP), whereas Cd, Pb, and Zn showed positive correlation with TOC, TN, and total sulfur (TS). The general linear model indicated that wetland type had a significant effect on As, Cd, Ni, Cu, Pb, Zn, Al, and Fe (p< 0.01), while depth had a significant effect on Cd, Cr, and Pb (p< 0.01). The findings of this work will contribute to pollution control and ecosystem health conservation of the Liaohe Delta.

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Distribution characteristics, risk assessment, and quantitative source apportionment of typical contaminants (HMs, N, P, and TOC) in river sediment under rapid urbanization: A study case of Shenzhen river, Pearl River Delta, China

Cited by 13 publications

References 38 publications

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

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

Assessment of environmental and carcinogenic health hazards from heavy metal contamination in sediments of wetlands

Characteristics and influencing factors of metal distribution in different wetlands of the Liaohe Delta, Northeastern China

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