Targeting Remediation Dredging by Ecological Risk Assessment of Heavy Metals in Lake Sediment: A Case Study of Shitang Lake, China

Understanding the spatial distribution and pollution characteristics of heavy metals in lake sediment is crucial for studying deposition and migration processes, assessing lake conditions, and determining the extent of remediation dredging. The present work is a case study of heavy metal pollution in Shitang Lake in Anhui province, China. Heavy metal concentrations were determined in sediment at locations across the lake to a depth of 100 cm, and pollution levels were assessed on the basis of the Geoaccumulation Index (Igeo) and Potential Ecological Risk Index (RI). Hg and Cd were the predominant heavy metals in the sediment, and the Igeo and RI indicated high pollution levels in the northern and southern zones of the lake. These findings can be used to guide the prioritization of dredging operations.

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Historical Evolution of Sources and Pollution Levels of Heavy Metals in the Sediment of the Shuanglong Reservoir, China

Water ◽

10.3390/w12071855 ◽

2020 ◽

Vol 12 (7) ◽

pp. 1855 ◽

Cited By ~ 1

Author(s):

Zike Zhou ◽

Yongping Wang ◽

Haowei Teng ◽

Hao Yang ◽

Aiju Liu ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Ecological Risk ◽

Metal Content ◽

Risk Index ◽

Potential Ecological Risk ◽

Heavy Metal Content ◽

Ecological Risk Index ◽

Potential Ecological Risk Index ◽

Pollution Levels

In this study, the concentrations of seven heavy metals (Cr, Ni, Cu, Zn, As, Hg, and Pb) and Pb isotope in a sediment core from the Shuanglong reservoir, Southwestern China, were investigated. Based on the constant rate of supply (CRS) model, the age span of a 60 cm sediment sample was determined to range from the years 1944 to 2015. Combined with chronology and heavy metal content, the evolution of the sources and pollution levels of heavy metals showed a changing trend composed of various stages. The sources of heavy metals transitioned from natural origins in 1944–1964 to industrial origins in 1965–2004. The subsequent reduction in heavy metal content was mainly due to the vigorous implementation of environmental protection policies from 2005 to 2012. In recent years (2013–2015), the heavy metal content has increased due to frequent human activity. Principal component analysis (PCA), correlation analysis, and the coefficient of variation (CV) analysis indicated that Cr, Ni, Cu, Zn, and As were derived from natural processes, Pb mainly came from automobile manufacturing, and Hg was mainly from industrial sources. The values of the geo-accumulation index (Ig), single pollution index (Pi), and single potential ecological risk index (Er) showed that the contamination of Hg and Pb was slight to moderate. Moreover, the values of the potential ecological risk index (RI), pollution load index (PLI), and Nemerow index (PN) indicated that the Shuanglong reservoir is under low ecological risk.

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Assessment of Heavy Metal Pollution Levels in Sediments and of Ecological Risk by Quality Indices, Applying a Case Study: The Lower Danube River, Romania

Water ◽

10.3390/w13131801 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1801

Author(s):

Valentina Andreea Calmuc ◽

Madalina Calmuc ◽

Maxim Arseni ◽

Catalina Maria Topa ◽

Mihaela Timofti ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Ecological Risk ◽

Metal Pollution ◽

Heavy Metal Pollution ◽

Surface Sediments ◽

Risk Index ◽

Potential Ecological Risk ◽

Danube River ◽

Pollution Indices

It is a well–known fact that heavy metal pollution in sediments causes serious problems not only in the Danube basin, but also in the large and small adjacent river streams. A suitable method for assessing the level of heavy metals and their toxicity in sediments is the calculation of pollution indices. The present research aims to assess heavy metal pollution in the Lower Danube surface sediments collected along the Danube course (between 180 and 60 km) up to the point where the Danube River flows into the Danube Delta Biosphere Reserve (a United Nations Educational, Scientific and Cultural Organization – UNESCO, protected area). In addition, this monitored area is one of the largest European hydrographic basins. Five heavy metals (Cd, Ni, Zn, Pb, Cu) were analyzed in two different seasons, i.e., the autumn of 2018 and the spring of 2019, using the Inductively Coupled Plasma Mass Spectrometry (ICP– MS) technique. Our assessment of heavy metal pollution revealed two correlated aspects: 1. a determination of the potential risks of heavy metals in sediments by calculating the Potential Ecological Risk Index (RI), and 2. an evaluation of the influence of anthropogenic activities on the level of heavy metal contamination in the surface sediments, using three specific pollution indices, namely, the Geo–Accumulation Index (Igeo), the Contamination Factor (CF), and the Pollution Load Index (PLI). The results of this pioneering research activity in the region highlighted the presence of moderate metal (Ni and Cd) pollution and a low potential ecological risk for the aquatic environment.

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Evaluation of Ecological Risk on Soil Heavy Metals Pollution of Qingyuan

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.928 ◽

2012 ◽

Vol 610-613 ◽

pp. 928-931 ◽

Cited By ~ 1

Author(s):

Hui Min Zhang ◽

Hui Zhang ◽

Ai Min Song ◽

Jian Qiao Qin ◽

Ming Wei Song

Keyword(s):

Heavy Metals ◽

Ecological Risk ◽

Risk Index ◽

Potential Ecological Risk ◽

Average Concentration ◽

Single Element ◽

Index Method ◽

Ecological Risk Index ◽

Heavy Metals Pollution

This paper was seleced Qingyuan as a case study, in order to analyze Hg, As, Cu, Zn, Pb, Cd, Ni, Cr concentrations of the soil samples. And used the Hakanson potential ecological risk index method to assess the potential ecological risks of concentrations of heavy metals in soil. The results shows that the average concentration of Hg, As, Cu, Zn, Pb, Cd, Ni, Cr in soil is 6.45, 0.26, 20.25, 119.11, 181.67, 189.22, 0.27, 32.92, 201.35 mg•kg-1 respectively. The rank by severity of ecological risk as Hg > Cu > Pb > As > Cr > Cd > Ni > Zn, based on their single-element indexes. Heavy metals in several samples of the soil have posed a serious threat on the ecosystem.

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Distribution and Potential Ecological Risk of Heavy Metals in Water, Sediments, and Aquatic Macrophytes: A Case Study of the Junction of Four Rivers in Linyi City, China

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16162861 ◽

2019 ◽

Vol 16 (16) ◽

pp. 2861 ◽

Cited By ~ 5

Author(s):

Xiuling Li ◽

Henglun Shen ◽

Yongjun Zhao ◽

Weixing Cao ◽

Changwei Hu ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Plant Species ◽

Ecological Risk ◽

Metal Pollution ◽

Heavy Metal Pollution ◽

Aquatic Macrophyte ◽

Risk Index ◽

Potential Ecological Risk ◽

Metal Concentrations

The Yi River, the second longest river in Shandong Province, China, flows through Linyi City and is fed by three tributary rivers, Beng River, Liuqing River, and Su River in the northeastern part of the city. In this study, we determined the concentrations of five heavy metals (Cr, Ni, Cu, Zn, and Pb) in water, sediment, and aquatic macrophyte samples collected from the junction of the four rivers and evaluated the potential ecological risk of heavy metal pollution. Most of the heavy metals in water were in low concentrations with the water quality index (WQI) below 1, suggesting low metal pollution. The sediments showed low heavy metal concentrations, suggesting a low ecological risk based on the potential ecological risk index (RI) and the geo-accumulation index (Igeo). The aquatic plant species Potamogeton crispus accumulated considerable amounts of heavy metals, which were closely related to the metal concentrations of the sediment. The plant species Salvinia natans also showed an excellent metal accumulation capability. Based on our results, the junction of the four rivers is only slightly polluted in terms of heavy metals, and the plant species P. crispus is a suitable bioindicator for sediment heavy metal pollution.

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Application of Principal Component Analysis for the Estimation of Source of Heavy Metal Contamination in Sugarcane Soil

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.651-653.1402 ◽

2014 ◽

Vol 651-653 ◽

pp. 1402-1409

Author(s):

Gui Ping Xu ◽

Xiao Fei Wang ◽

Li Jun Chen

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Principal Component Analysis ◽

Ecological Risk ◽

Metal Contamination ◽

Heavy Metal Contamination ◽

Risk Index ◽

Principal Component ◽

Component Analysis ◽

Potential Ecological Risk

Concentrations of heavy metals in sugarcane soil of Guangxi were determined and the potential ecological risk index was used simultaneously to evaluate the extent of heavy metals enrichment contamination. Results showed that the pollution extent of heavy metals in sugarcane soil by potential ecological risk followed the order: Cd>Pb>Cu>Zn, Cu and Zn were slightly polluted, with small potential ecological harm, while Pb and Cd were above moderately polluted, with heavy potential ecological harm. Principal component analysis was applied to estimate the sources of heavy metals contamination, the results indicated that the first two components accounted for 61.016% and 26.920% of the total variance respectively, 4 kinds of heavy metal elements had similar sources, tailing dam lead-zinc concentrator upstream along the coast was the main sources of heavy metal contamination.

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Heavy Metal Loading in Surface Sediments along the Kawere Stream, Tarkwa, Ghana

Ghana Mining Journal ◽

10.4314/gm.v20i2.9 ◽

2020 ◽

Vol 20 (2) ◽

pp. 77-85

Author(s):

S. A. Ndur ◽

S. Y. Nyarko ◽

I. Quaicoe ◽

L. B. Osei

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Ecological Risk ◽

Anthropogenic Activities ◽

Risk Index ◽

Sediment Quality ◽

Ecological Integrity ◽

Pollution Assessment ◽

Well Being ◽

Potential Ecological Risk

Sediment contamination by heavy metals resulting from anthropogenic activities is increasingly becoming a global concern due to the risk it poses to human well-being and ecological integrity at large. The purpose of this study was to assess the heavy metals loading in sediment along the Kawere stream. Ten sediment samples were collected, acid digested and analysed for copper (Cu), lead (Pb), cadmium (Cd), manganese (Mn), zinc (Zn), nickel (Ni), chromium (Cr), cobalt (Co) and iron (Fe) using a Varian AA240FS Atomic Absorption Spectrometer (AAS). The Australian and New Zealand Environment and Conservation Council (ANZECC) guidelines for freshwater sediment quality was used as the benchmark against which the measured metal concentrations were compared. Nemerow’s pollution and potential ecological risk indices were used to evaluate the pollution status and ecological risk levels of the heavy metals in the stream. The results obtained indicated that, except Cu which exceeded the ANZECC trigger value of 65 mg/kg at three sampling sites (K01=171.29 mg/kg, K05=170.83 mg/kg and K07=113.31 mg/kg), all other measured heavy metals concentrations were below their corresponding ANZECC values. Heavy metal pollution assessment showed that three samples (K01, K05 and K07) were slightly polluted, suggesting the likelihood of posing a health threat to the aquatic organisms and humans. Calculated Ecological Risk Index (RI) ranged from 3.229 to 19.750 (RI < 150), representing a low ecological risk. As such, the metals, Cu, Ni, Cd, Pb, Cr, and Zn pose a low ecological risk to the aquatic ecosystem. Although the ecological risk is low based on the current results, constant monitoring of the stream quality is recommended due to the increasing human activities along the stream as well as the sediments ability to accumulate and remobilise heavy metals back into the water column and possibly transferring them through the food chain. Keywords: Heavy Metals, Sediment, Ecological Risk Assessment, Pollution, Stream

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Evaluation of Heavy Metal Pollutants From Plateau Mines in Wetland Surface Deposits

Frontiers in Environmental Science ◽

10.3389/fenvs.2020.557302 ◽

2021 ◽

Vol 8 ◽

Author(s):

Li Yu ◽

Shi Kaiyi ◽

Yuan Jie ◽

Kuang Qiyu

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Ecological Risk ◽

Human Activities ◽

Surface Sediments ◽

Potential Ecological Risk ◽

Toxic Heavy Metals ◽

Artificial Wetlands ◽

Mining Areas ◽

Pollution Levels

The Liupanshui Minghu Wetland is a typical artificial urban wetland in a plateau mining region. It is important to identify the sources and potential ecological risks of heavy metal contaminants in its surface sediments to monitor the wetland and the downstream water quality and prevent pollution. In this study, we measured the concentrations of six toxic heavy metals (Pb, Zn, Cr, Cu, Ni, and Cd) in the surface sediments collected from the Liupanshui Minghu Wetland. Further, the geological accumulation indices of heavy metals and their potential ecological risk indices, pollution levels, and associated ecological hazards were evaluated. The average levels of Pb, Zn, Cr, Cu, Ni, and Cd in the superficial sediments were 197, 222, 79.0, 59.1, 68.6, 4.67 mg/kg, respectively. With the exception of Cr, the concentrations of the remaining metals were greater than the background levels in the region. The Statistical analysis indicated a strong correlation between Pb, Zn, Cr, and Cu (p < 0.01). The pollution in the wetland by these elements can be attributed to human activities such as transportation, industrial activity, and agricultural production. Ni and Cd pollution can be attributed to human activities, such as coal mining, and natural phenomena, such as the weathering of mountains and rocks. The geological accumulation indices of Zn, Ni, and Cu indicated low levels of accumulation and minimal contamination. Cd and Pb were moderately enriched, and the levels of Cd and Pb contamination ranged from moderate to high. The potential ecological risk to the Shiyuan region (S) was the highest among the three regions in the wetland park. It was followed by the Longtoutan (L) region, and the potential ecological risk was the lowest in the Erdaoba (E) region. Among the six heavy metals, Cd was the main contributor to pollution in the Minghu Wetland. This study also strives to provide theoretical basis and data support for the prevention and control of heavy metal pollution in artificial wetlands in Alpine mining areas.

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Pollution, Ecological Risk and Source Identification of Heavy Metals in Sediments from the Huafei River in the Eastern Suburbso Kaifeng, China

10.21203/rs.3.rs-368427/v2 ◽

2021 ◽

Author(s):

Bingyan Jin ◽

Jinling Wang ◽

Wei Lou ◽

Liren Wang ◽

Jinlong Xu ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Ecological Risk ◽

Metal Pollution ◽

Risk Index ◽

Potential Ecological Risk ◽

Ecological Risk Index ◽

Industrial Activities ◽

Geo Accumulation

Abstract Rivers in urban environments are significant components of their ecosystems but remain under threat of pollution from unchecked discharges of industrial sewage and domestic wastewater. Such river pollution, particularly over the longer term involving heavy metals, is an issue of worldwide concern regarding risks to the ecological environment and human health. In this study, we investigate the long-term pollution characteristics of the Huafei River, an important urban river in Kaifeng, China. River sedimentary samples were analyzed, assessing the degree and ecological risk of heavy metal pollution using the geo-accumulation index and potential ecological risk index methods; whilst Pearson’s correlation, principal component, and cluster analyses were used to identify the sources of pollution. The results show that heavy metal concentrations are significantly higher than their corresponding fluvo-aquic soil background values in China, and the geo-accumulation indexes indicate, that of the 8 heavy metals identified, Hg is most prevalent, followed in sequence by Cd > Zn > Cu > Pb > Ni > As > Cr. The potential ecological risk index of the Huafei river is very high, with the potential ecological risk intensity highest in the midstream and downstream sections where it is recommended that pollution control is carried out, especially concerning Hg and Cd. Long-term sequence analysis indicates that Cu and Pb dropped sharply from 1998 to 2017, but rebounded in 2019, and that Zn shows a continuous decreasing trend. Four main sources for the heavy metal contaminants were identified: Cr, Cu, Ni, Pb, Zn and Hg derived mainly from industrial activities, traffic sources and natural sources; Cd originated mainly from industrial and agricultural activities; whilst As was mainly associated with industrial activities. It is anticipated that the findings of this study will provide theoretical references for the effective control and scientific management of heavy metal pollution in the Huafei River and its surrounding areas.

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The Contamination Status of Heavy Metal in the Sediment of Beng River and the Protection for the Ecological Safety Engineering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1809 ◽

2013 ◽

Vol 726-731 ◽

pp. 1809-1812

Author(s):

Ji Cai Qiu

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Ecological Risk ◽

River Sediment ◽

Risk Index ◽

Pollution Index ◽

Potential Ecological Risk ◽

Sediment Pollution ◽

Ecological Risk Index ◽

Rubber Dam

To find out the heavy metal pollution condition from the Beng River sediment, we see the region from Beng River Rubber Dam to the Yimeng Road Bridge as research object.We monitored and surveyed on the three kinds of metal components (Cu, Zn, Cd) in the sediments from eight sectionsthe. With reference to the relevant domestic standards, we established sediment pollution evaluation criteria suitable for the region., We conducted the evaluation of ecological risk and pollution levels with the detection results by standard index of the potential ecological risk index and Nemerow France France. The results showed that: the heavy metals ecological risk index in Sediment from Beng River Rubber Dam to the Yimeng Road bridge section, Nemerow pollution index was 6.95, It was heavily polluted. This showed that the heavy metals in river sediment pollution was very serious.

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Pollution Characteristics and Ecological Risk Assessment of Heavy Metals in Sediments of the Three Gorges Reservoir

Water ◽

10.3390/w12061798 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1798

Author(s):

Lujie Shui ◽

Xiaojie Pan ◽

Xiaojuan Chen ◽

Fengyi Chang ◽

Duanji Wan ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Cluster Analysis ◽

Ecological Risk ◽

Three Gorges Reservoir ◽

Risk Index ◽

Potential Ecological Risk ◽

Three Gorges ◽

Ecological Risk Index ◽

The Three Gorges

In order to understand the spatial distribution and ecological risk of heavy metal pollution in the sediments of the Three Gorges Reservoir, surface sediment samples in six typical tributaries and estuaries were analyzed. The heavy metal content in sediment was detected by ICP-MS (PE Elan DRC Ⅱ, PerkinElmer, Waltham, MA, USA) after digestion by mixed acid. The data were evaluated and analyzed using multiple methods, including the potential ecological risk index, the geoaccumulation index (Igeo), and cluster analysis. The results show that the tributary surface sediments were polluted by heavy metals to a certain extent. Cu, Zn, Pb, and Cr have been enriched in sediments in recent years. The results of Igeo show that the pollution degree is as follows: Pb > Cu > Zn > Cr > Cd > Ni > As > Hg. According to the potential ecological risk index, the grades of Yunyang, Xiaojiang, and Xinjin are all medium risk, and Cd has the highest contribution rate. Combined with field investigation data, cluster analysis, and correlation analysis, we conclude that Cu, Zn, and Cr are likely to come from agricultural chemical fertilizers and industrial sewage, while Pb mainly comes from the discharge of ship fuel.

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