Interannual variation and sources identification of heavy metals in seawater near shipping lanes: Evidence from a coral record from the northern South China Sea

Xie, Sirong; Jiang, Wei; Sun, Yinan; Yu, Kefu; Chen, Feng; Han, Yansong; Xiao, Yuwen; Wei, Chaoshuai

doi:10.1016/j.scitotenv.2022.158755

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…The values were greater than 0.50, indicating anthropogenic activities caused the nutrient enrichment in sediments. 32 The primary cause lies in the widespread use of nitrogen, phosphorus, and organic fertilizers in local agriculture, combined with a lack of effective management measures for farmland runoff. 33,34 Unlike other eutrophication indexes in the sediment samples, the TK content was consistently lower than the local soil background value, and its coefficient of variation was low (0.1701).…”

Section: Data Analysis and Visualizationmentioning

confidence: 99%

Reducing Arsenic, Cadmium, and Lead Exposure in Urban Areas via Limiting Nutrient Discharges into Rivers

Wang,

Bian,

Shen

et al. 2023

ACS EST Water

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Urban rivers are subjected to potentially toxic element pollution, which is concentrated in river sediments and poses a risk to hydrobiosis and human health. Reducing the accumulation of potentially toxic elements in sediments is a sustainable way to mitigate this risk. In this study, the field sampling of river sediments in Tongxiang, China, to characterize their eutrophication indicators and As, Cd, and Pb concentrations was conducted to assess the potential exposure risks. A combination of statistical analysis and machine learning techniques was employed to identify the drivers of potentially toxic element accumulation in the sediments. Results indicate that eutrophication is the key factor contributing to potentially toxic element accumulation in sediments. The random forest model, with R 2 values of 0.434, 0.790, and 0.798 for As, Cd, and Pb, respectively, provided the best prediction of potentially toxic element concentration. TP, TOC, and TN had the most significant impact on As, Cd, and Pb accumulation in sediments, respectively. The scenario analysis revealed that a 20% and 50% decrease in the eutrophication index of sediments resulted in an average reduction of 7.50% and 7.88% in As content, 18.92% and 45.95% in Cd content, and 14.67% and 35.21% in Pb content, respectively. Our study provides valuable information for policymakers to develop strategies for preventing and controlling potentially toxic element pollution in urban areas.

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Section: Data Analysis and Visualizationmentioning

confidence: 99%

Reducing Arsenic, Cadmium, and Lead Exposure in Urban Areas via Limiting Nutrient Discharges into Rivers

Wang,

Bian,

Shen

et al. 2023

ACS EST Water

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“…as extra sources can be attributed to most anthropogenic bioactive trace metals in sinking particles. Additionally, another possible anthropogenic source is the recently revealed contribution of marine transportation activities, including the influence of fuel consumption, ballast water, oil spills, and marine oil extraction on heavy metals in marine shipping areas [39,40].…”

Section: Source Identificationmentioning

confidence: 99%

Different Source Contributions of Bioactive Trace Metals in Sinking Particles in the Northern South China Sea

Li,

Zhang,

et al. 2023

JMSE

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Time-series samples intercepted via three synchronized moored sediment traps, deployed at 1000 m, 2150 m, and 3200 m in the northern South China Sea (NSCS) during June 2009–May 2010, were analyzed to quantify the bioactive trace metal fluxes in sinking particles and investigate their different source contributions. Iron (Fe) primarily originated from lithogenic sources. Manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn) exhibited various degrees of enrichment over their continental crustal ratios. Since the sources of bioactive trace metals in sinking particles can be divided into lithogenic, biogenic, and excess fractions, mass conservation calculations were used to quantify the contribution of each source. The results showed that Fe, Mn, and Co had extremely low biogenic proportions (0.1–3.3%), while Ni, Cu, and Zn had higher proportions (2.7–17.3%), with the biogenic fraction decreasing with the depth. Moreover, excess sources accounted for a significant proportion of Mn (68–75%), Co (34–54%), Ni (60–62%), Cu (59–74%), and Zn (56–65%) in sinking particles at the three sampling depths. The excess fractions of Mn, Co, and Cu in sinking particles can be affected by authigenic particles. This is supported by their similar scavenging-type behavior, as observed via the increase in their fluxes and enrichment patterns with the increasing depth. Furthermore, the excess fractions of Ni, Cu, and Zn may have significant contributions from anthropogenic sources. The variability of Fe in sinking particles was mainly controlled via lithogenic matter. Notably, organic matter and opal were found to be pivotal carriers in the export of excess bioactive trace metals (Mn, Co, Ni, and Cu) via the water column, accompanied with the elevated ballast effect of lithogenic matter with the depth. However, the transportation of excess Zn was more complicated due to the intricate processes involved in Zn dynamics. These findings contribute to our understanding of the sources and transport mechanisms of bioactive trace metals in the marine environment.

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“…Heavy metals are widely present in industrial effluents, antifouling paint on fishing boats, ships, and municipal wastewater, and large accumulations of industrial wastes and effluents have the potential to pollute the coastal environment (Jha et al, 2021;Xie et al, 2023). Several studies have found that heavy metal accumulation in sediments along the southeast coast of India may be caused by point sources such as direct discharge of significant amounts of industrial and domestic wastes into rivers and coastal waters (Muthu and Jayaprakash, 2008;Satpathy et al, 2012;Barath Kumar et al, 2017;Gopal et al, 2017;Tholkappian et al, 2018;Jha et al, 2019;Jha et al, 2021;Kannan et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Ecological risk assessment of heavy metals in the coastal sediment in the South-western Bay of Bengal

Naik,

Pradhan,

Karthikeyan

et al. 2023

Front. Mar. Sci.

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Dynamic coastal waters are often polluted by chemical pollutants, affecting coastal ecosystems. A total of four scientific coastal cruises up to 10 km offshore from the coastline along the Chennai-Puducherry coast during 2019-20 were conducted. This study examined the spatiotemporal distribution of heavy metals (Cr, Cu, Pb, Cd, Ni, Zn, As, Co, Mn) in the coastal sediments using various geochemical indices, including the Geo-accumulation Index (Igeo), Enrichment Factor (EF), Contamination Factor (CF), and Ecological Risk Index (ERI), to understand the impacts, environmental risks, and pollution status in coastal and marine systems. The heavy metal concentrations of Cr, Cu, Pb, Cd, Ni, Zn, As, Co, and Mn in sediments are 16.48-74.70 μg/g, 2.01-3.78 μg/g, 1.37-17.54 μg/g, 0.20-21.76 μg/g, and 5.73-40.53 μg/g, 4.73-53.54 μg/g, 2.09-28.18 μg/g, 1.80-9.02 μg/g, 70.27-346.22 μg/g, respectively. The Igeo results revealed that none of the metals reached up to the contamination level except for Cd and As which showed a slightly contaminated level of the sediment. ERI indicated that coastal sediments are at moderate to high ecological risk from heavy metals. This study will help policymakers make informed decisions for combating or remediating metal pollution to safeguard the coastal environment.

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Interannual variation and sources identification of heavy metals in seawater near shipping lanes: Evidence from a coral record from the northern South China Sea

Cited by 10 publications

References 40 publications

Reducing Arsenic, Cadmium, and Lead Exposure in Urban Areas via Limiting Nutrient Discharges into Rivers

Reducing Arsenic, Cadmium, and Lead Exposure in Urban Areas via Limiting Nutrient Discharges into Rivers

Different Source Contributions of Bioactive Trace Metals in Sinking Particles in the Northern South China Sea

Ecological risk assessment of heavy metals in the coastal sediment in the South-western Bay of Bengal

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