Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River

Zhao, Qinghe; Ding, Shengyan; Hong, Zhendong; Ji, Xiaoyu; Wang, Shuoqian; Lu, Mengwen; Jing, Yaru

doi:10.1016/j.ecoenv.2021.112943

Cited by 17 publications

(4 citation statements)

References 41 publications

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“…Furthermore, As and Cr concentrations, which showed quadratic variations in the reservoir in the later season, should be attributed to the releasing effect of the Sanmenxia Reservoir and the trapping effect of the XLD Reservoir, which led to high values of As and Cr occurring downstream near the Sanmenxia Dam and in the XLD reservoir before the dam. Pb concentrations in the downstream also showed quadratic variations in the later season, which should be attributed to the exogenous input from agricultural practices further downstream the XLD [31]. Additionally, the HM concentrations obtained in this study were comparable to those of the other water bodies in China, for example, the Three Gorges Reservoir [14,22], Taihu Lake [50], and Wen-Rui Tang River [42].…”

Section: Spatial-temporal Variation In Concentration Of Heavy Metals ...supporting

confidence: 69%

“…Meanwhile, the downstream reach of the XLD Reservoir is famously referred to as a "suspended river" with its riverbed 7-13 m higher than the surrounding landscape and a large area of riparian zones bounded by levees [24,30]. Since the implementation of the WSRS in 2002, drastic alterations in the hydrodynamic conditions of the reservoir area and the downstream reach have occurred [31], which has fundamentally altered the resuspension and redeposition of HMs in water, as well as the interaction and exchange between the riverbed and the water column.…”

Section: Study Areamentioning

confidence: 99%

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Concentration, Health Risk, and Hydrological Forcing of Heavy Metals in Surface Water Following Water-Sediment Regulation of the Xiaolangdi Dam in the Yellow River

Zhao

Ding

Geng

et al. 2022

IJERPH

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Water and sediment regulation aimed at aquatic ecosystems and preserving reservoir capacity to minimize the negative consequences of dams can fundamentally change the distribution of heavy metals (HMs) in the reservoir and downstream reaches. However, the effects of water and sediment regulation on variation in HMs are still poorly understood. In this study, the variations in concentration, contamination, human health risk, potential sources, and influencing factors of the metalloid As and HMs (Cr, Hg, Ni, Pb, and Zn) in surface water in the reservoir and the downstream reach of the Xiaolangdi Dam (XLD) following the operation of the water-sediment regulation scheme (WSRS) were determined. These results indicate that HM concentrations in the two post-WSRS seasons were much lower than the water quality standards, but were significantly increased over time due to the trapping effects of the XLD (p < 0.05, except for Zn). However, As concentration in the reservoir was significantly lower than that observed in downstream reaches, likely due to anthropogenic input from agricultural activities. Meanwhile, HM concentrations varied with distance to the dam, which displayed a distinct accumulation closer to the dam in the post-WSRS II season. The contamination of HMs, the carcinogenic risk of exposure to As, and the noncarcinogenic risks associated with exposure to Hg, Ni, Pb, and Zn via the direct ingestion pathway of drinking water were all within acceptable levels following the WSRS, but increased over time. The carcinogenic risk of Cr in the post-WSRS II season was at an unacceptably high level, particularly at sites near the dam. Hydrological characteristics (water level and flow rate) were the dominant factors in determining the distribution of HMs. These results can provide new insight for a better understanding of the variations in HMs following the water and sediment regulation practices, and guide future management in regulating the trapping effects of dams.

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Section: Spatial-temporal Variation In Concentration Of Heavy Metals ...supporting

confidence: 69%

Section: Study Areamentioning

confidence: 99%

Concentration, Health Risk, and Hydrological Forcing of Heavy Metals in Surface Water Following Water-Sediment Regulation of the Xiaolangdi Dam in the Yellow River

Zhao

Ding

Geng

et al. 2022

IJERPH

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“…Artificial dams tend to decrease the flow velocity of a river and consequently promote the settling of suspended particles such as silt, clay or Fe and Al oxides/hydroxides onto the upstream bed sediments (Jeong et al, 2014; Shim et al, 2015; Zhao et al, 2021). In consequence, metal (loids) fixed onto these suspended particles tend to accumulate in the sediments, leading to an enrichment.…”

Section: Introductionmentioning

confidence: 99%

Environmental risk assessment of the contamination of river water and sediments from the Bor mining area, East Serbia―Secondary Cu enrichment at the reservoir site

et al. 2023

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The study area is within the Bor copper mining region, Eastern Serbia, where wastewaters from the Bor metallurgical/smelting facilities have caused serious copper (Cu) and arsenic (As) contamination to the Timok river system. The operating conditions at smelting facilities control the pH of the river waters, resulting in highly acidic waters in 2019 than 2015. This study compares the mobility of Cu and As and risk assessment of river water contamination during both years as well as assessing the risks of riverbed sediments contamination and investigating the origins of Cu and As pollution. In the river system, As generally existed as a particulate species in the entire study area during both years and was widely removed from river waters by sorption onto the hydrous ferric oxides (HFO), whereas dissolved Cu was removed from river waters only at neutral pH conditions with hydrous aluminum oxides (HAO) and HFO at the downstream reservoir site of Timok River. Despite the similarity in Cu mobility during both years, the lower pH of river waters in 2019 than 2015 enabled dissolved Cu species to be transported farther downstream, resulting in a higher level of river water pollution. The contamination factor (CF), used to estimate levels of sediment pollution, had higher values for Cu and As compared to Zn, Pb, Co, and Ni. The CF values of Cu were the highest in sediments near the Bor metallurgical/smelting facilities and at downstream reservoir site, whereas the CF values of As were generally high in the entire research field. Additionally, the ecological risk potential (Er) values of Cu were the highest in sediments of the Bor River and Timok River, reflecting an enrichment of Cu at these sites. Finally, a clarification on the origin of Cu pollution and risks of mobilization was inferred from the sequential extraction test. The predominant Cu species in sediments of the upstream region were oxidizable and residual, hosted by copper sulfides originating from the flotation tailings, suggesting a relatively low risk of Cu release from these sediments. However, at the downstream site (especially reservoir sediments), the contribution of acid‐soluble Cu was 34.8%, suggesting a higher risk of Cu release. The highest contributions of acid‐soluble and reducible Cu (18%) at the reservoir site were promoted by the effective settlement of Cu‐sorbing HAO and HFO. The Cu contents of these two fractions were 0.86 wt%, almost three times higher than that of Cu ore in Veliki Krivelj open pit mine.

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“…Based on studies of heavy metals in reservoir sediments, heavy metals in sediments have seriously threatened aquatic ecosystems in China (Zhao et al 2021;Yang et al 2022), posing a signi cant health risk to humans through the food chain, and that Cd and Hg contributed 90% to RI in the water reservoir of Irrigation-T (Deng et al 2020). Enrichment factor (EF) and geo-accumulation index (I geo) were applied to assess the enrichment status of heavy metals of Mi yun Reservoir by Wu et al (2017), indicating that heavy metals in the sediments mainly originated from non-point source pollution and soil-water erosion.…”

Section: Introductionmentioning

confidence: 99%

Distribution, risk assessment of heavy metals in sediments, and their potential risk on water supply safety of a drinking water reservoir, middle China

Liu

Zhou

Gong

et al. 2023

Environ Sci Pollut Res

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Heavy metals in reservoir sediments were analyzed to assess the pollution level and to understand the potential risk on water supply safety. Heavy metals in sediments will enter the biological chain through bio-enrichment and bio-ampli cation in water and eventually pose a threat to the safety of drinking water supply. Analysis of eight sampling sites in JG (Jian gang) drinking water reservoir of the sediments showed that from Feb-2018 to Aug-2019 heavy metals including Pb, Ni, Cu, Zn, Mo and Cr increased by 1.09%-17.2%. Vertical distributions of heavy metals indicated that the concentrations increased gradually by 9.6%-35.8%. Risk assessment code analysis indicated that Pb, Zn and Mo were of high risk in the main reservoir area. What's more, enrichment factors of Ni and Mo were 2. 76-3.81 and 5.86-9.41, respectively, showing the characteristics of exogenous input. The continuous monitoring results of the bottom water showed that the concentration of heavy metals in the bottom water exceeded the environmental quality standard value of surface water in China, and exceeded the standard by 1.76 times (Pb), 1.43 times (Zn), 2.04 times (Mo), respectively. Heavy metals in the sediments of JG Reservoir, especially in the main reservoir area, have a potential risk of release from the sediment to the overlying water. Water supply reservoir as a source of drinking water, its quality is directly related to human health and production activities. Therefore, this rst study on JG Reservoir is of great signi cance for the protection of drinking water safety and human health.

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Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River

Cited by 17 publications

References 41 publications

Concentration, Health Risk, and Hydrological Forcing of Heavy Metals in Surface Water Following Water-Sediment Regulation of the Xiaolangdi Dam in the Yellow River

Concentration, Health Risk, and Hydrological Forcing of Heavy Metals in Surface Water Following Water-Sediment Regulation of the Xiaolangdi Dam in the Yellow River

Environmental risk assessment of the contamination of river water and sediments from the Bor mining area, East Serbia―Secondary Cu enrichment at the reservoir site

Distribution, risk assessment of heavy metals in sediments, and their potential risk on water supply safety of a drinking water reservoir, middle China

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