Distribution and transport of heavy metals in estuarine–inner shelf regions of the East China Sea

Wang, Chenglong; Zou, Xinqing; Feng, Ziyue; Hao, Zhe; Gao, Jianhua

doi:10.1016/j.scitotenv.2018.06.383

Cited by 54 publications

(15 citation statements)

References 45 publications

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“…The total concentration of the 16 PAHs (ΣPAH) in the ECS reported by Lin et al () from 2006 ranged from 38–308 ng g −1 (dry weight (dw); all further results refer to this), with a mean of 122 ± 60 ng g −1 (Figure a and Table ) , while those in our results from 2018 ranged from 8–414 ng g ‐1 , with a mean value of 112 ± 77 ng g ‐1 (Figure d and Table ). The mean value of ΣPAH in 2018 was lower than that in 2006, but the concentration range was larger, which is surprising because PAHs mainly originate from human activities and their concentration in the environment has a good correlation with socioeconomic development (Liu et al, ; Wang et al, ). Between 2006 and 2018, China's economy developed rapidly, especially in the Changjiang (Yangtze) River catchment, which should have released increasing amounts of PAHs into the environment.…”

Section: Resultsmentioning

confidence: 97%

“…We conducted grain‐size analysis using the methods described in Wang et al (). Briefly, all samples were treated to remove organic matter using H 2 O 2 solution (10%) and calcium carbonate using hydrochloric acid (10%), then dispersed in sodium metaphosphate for 24 hr.…”

Section: Methodsmentioning

confidence: 99%

“…Briefly, after extraction, the extract was concentrated and further purified on a 1:1 alumina/silica gel glass column (8 mm diameter) and finally concentrated to exactly 1 ml. The 16 EPA priority PAHs (naphthalene (Nap), acenaphthene (Ace), acenaphthylene ( We conducted grain-size analysis using the methods described in Wang et al (2018). Briefly, all samples were treated to remove organic matter using H 2 O 2 solution (10%) and calcium carbonate using hydrochloric acid (10%), then dispersed in sodium metaphosphate for 24 hr.…”

Section: Laboratory Analysismentioning

confidence: 99%

“…In addition to dam construction, the Water and Soil Conservation Project implemented in the high sediment yield region of the upper Changjiang basin in the 1980s could be another factor resulting in abrupt reductions in sediment loads (Dai & Lu, ). Such drastic reductions in sediment discharge have caused significant changes in the sedimentary environment and hydrodynamics of the ECS's estuarine‐inner shelf regions (Gao et al, ; Wang et al, ; Yang et al, ). In addition, reservoir interception of coarse‐grained sediment from upper reaches has induced channel erosion in the middle and lower reaches, substantially changing the sediment component reaching the ECS (Gao et al, ; Yang et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Shifts in the Distribution and Fate of Sedimentary Polycyclic Aromatic Hydrocarbons Within the Estuarine‐Inner Shelf Areas of the East China Sea: Response to Human‐Induced Catchment Change

et al. 2020

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Human-induced changes in river catchments, such as damming, can affect estuarine depositional settings and further affect the transport of sediments and associated pollutants. Polycyclic aromatic hydrocarbons (PAHs) in surface sediments from the East China Sea (ECS) at two time nodes (2006 and 2018) were compared to understand the response of PAHs to human-induced catchment changes. PAH concentrations in the ECS ranged from 8-414 ng g −1 (dry weight), with a mean value of 112 ± 77 ng g −1 , relatively low than that in 2006 (38-308 ng g −1 , with a mean of 122 ± 60 ng g −1 ). Sharp decreases in sediment loads have triggered erosion in subaqueous delta and changed the distribution of sediment components, which may eventually influence the distribution pattern of PAHs. The obvious spatial differentiation of PAHs between 2006 and 2018 suggested that the depositional center of PAHs shifted from the estuary to the inner shelf area. PAH deposition patterns in the ECS were primarily influenced by riverine input before 2006 but are now dominated by winnowing processes related to long-distance transport due to sharply decreased sediment loads. Dam construction in the river catchment intercepted large amounts of sediments and PAHs, shifting the Changjiang-derived PAH depositional center from the ocean to reservoirs. Overall, depositional patterns of PAHs in the ECS were largely altered by human-induced catchment changes, which may cause significant impacts on the region's biogeochemical cycles and ecosystem health. Plain Language SummaryCoastal oceans are usually considered important sinks of terrestrial materials, especially river-dominated coastal margins. However, river-derived terrestrial materials have decreased drastically in the last several decades worldwide, due to intensified human activities that have changed the local sedimentary environment. In this study, changes in the surface sediment grain size within the East China Sea from 2006 to 2018 indicated that the sedimentary environment in this region was clearly altered. Similarly, the distributions and compositions of PAHs in surface sediments changed from 2006 and 2018. Based on combined analysis of grain size and PAHs, we found that PAH dynamics in this region were primarily influenced by riverine inputs before dam construction in the Changjiang (Yangtze) River basin but are now dominated by winnowing processes related to long-distance transport due to sharply decreased sediment loads. Therefore, intensified human-induced catchment changes have significant influenced the fate of PAHs in the East China Sea.

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Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Laboratory Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shifts in the Distribution and Fate of Sedimentary Polycyclic Aromatic Hydrocarbons Within the Estuarine‐Inner Shelf Areas of the East China Sea: Response to Human‐Induced Catchment Change

et al. 2020

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“…erefore, the spatial patterns of heavy metals are closely related to sediment types [9]. e spatial distributions of heavy metals are often consistent with those of fine-grained sediments [10]. Most heavy metals become part of the sediment through different biogeochemical processes, which trigger precipitation and deposition [11].…”

Section: Introductionmentioning

confidence: 94%

Spatial Variations and Potential Risks of Heavy Metals in Seawater, Sediments, and Living Organisms in Jiuzhen Bay, China

Sun

Liu

et al. 2020

Journal of Chemistry

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Coastal waters are polluted by heavy metals to varying degrees, posing potential risks to marine ecology and human health. In May 2006, the pollution levels, sources, and ecological risks of heavy metals (Cu, Pb, Zn, Cd, Hg, and As) in seawater, surface sediments, and living organisms were studied in Jiuzhen Bay in Fujian, China. This study identified Hg (0.26–0.72 µg/L) and As (20.3–31.5 µg/L) pollution in the seawater of Jiuzhen Bay. In sediments, heavy Pb pollution (946 µg/g dw) was only detected at one station at a level posing very serious potential risk, while Hg pollution (0.052–0.087 µg/g dw) was observed at three stations at a level posing serious potential risk. No heavy metal pollution was detected in sediments at other stations. The concentrations of five heavy metals (Cu, Zn, As, Cd, and Pb) exceeded the corresponding National Quality Standards for oysters, indicating heavy pollution, based on an ecological risk assessment. In clams, two heavy metals (Pb and As) exceeded the standards, indicating light pollution, based on an ecological risk assessment. No heavy metal pollution was found in fish or shrimps. The heavy metals in the seawater and sediments of Jiuzhen Bay are mainly derived from the river discharges of Luxi and Wujiang Rivers although sewage discharge along the coast of Jiuzhen Bay is another source of heavy metal pollution at some stations. Given the pollution of Pb, Hg, and As in seawater and sediments at some stations within the bay, the potential risks of Pb, Hg, and As in living organisms to both the marine ecology and human health deserve increased attention.

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Heavy metals in sediments of Yellow Sea and East China Sea: Chemical speciation, distribution, influence factor, and contamination

et al. 2021

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Ecological purifi cation in a reservoir is an important strategy to control the level of nutrients in water. The bacterial community of such a reservoir is the main agent for pollutant degradation, which has not been fully documented. Taking the Jinze Reservoir, a freshwater source for Shanghai, China as the case, its spatial distributions of water and sediment bacteria were determined using 16S rRNA gene-based Illumina MiSeq sequencing , and the environmental parameters were analyzed. The reservoir takes natural river water and functions as an ecological purifi cation system, consisting of three functional zones, i.e., pretreatment zone, ecological purifi cation zone, and ecological sustaining zone. Results show that the concentrations of both total nitrogen (TN) and total phosphorus (TP) decreased considerably after the ecological treatment, and the concentration of dissolved oxygen (DO) in the ecological purifi cation zone was boosted from that before pretreatment. In addition, patterns of bacterial communities in both water and sediment were similar and consisted of mainly Proteobacteria, Actinobacteria, and Bacteroidetes. However, diff erence in water bacterial composition was distinct in each functional zone, whereas the bacterial communities in sediment changed only slightly among sediment samples. Network analysis revealed nonrandom co-occurrence patterns of bacterial community composition in water and sediment, and Pseudomonas , unclassifi ed Comamonadaceae, Variovorax , and Dechloromonas were the key taxa in the co-occurrence network. The bacterial taxa from the same module of the network had strong ecological connections, participated in C-cycles, and shared common trophic properties. PICRUSt analysis showed that bacteria were involved potentially in various essential processes; and the abundance of predicted xenobiotic biodegradation genes showed a decreasing trend in water samples from the inlet to the outlet of the reservoir. These results improve our current knowledge of the spatial distribution of bacteria in water and sediment in ecological purifi cation reservoirs.

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Distribution and transport of heavy metals in estuarine–inner shelf regions of the East China Sea

Cited by 54 publications

References 45 publications

Shifts in the Distribution and Fate of Sedimentary Polycyclic Aromatic Hydrocarbons Within the Estuarine‐Inner Shelf Areas of the East China Sea: Response to Human‐Induced Catchment Change

Shifts in the Distribution and Fate of Sedimentary Polycyclic Aromatic Hydrocarbons Within the Estuarine‐Inner Shelf Areas of the East China Sea: Response to Human‐Induced Catchment Change

Spatial Variations and Potential Risks of Heavy Metals in Seawater, Sediments, and Living Organisms in Jiuzhen Bay, China

Heavy metals in sediments of Yellow Sea and East China Sea: Chemical speciation, distribution, influence factor, and contamination

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