Fractionation and risk assessment of metals in sediments of an ocean dumping site

Jung, Jun-Mo; Choi, Ki‐Young; Chung, Chang-Soo; Kim, Chang-Joon; Kim, Suk Hyun

doi:10.1016/j.marpolbul.2019.02.041

Cited by 24 publications

(10 citation statements)

References 55 publications

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“…The complexation of HMs by organic matter plays an important role in the distribution patterns of HMs in Daya Bay. Apart from Hg and Cd, As was significantly correlated with Zn and Pb (p < 0.01) and weakly correlated with Cu (p < 0.05), indicating that they had similar sources, as reported in other studies [50]. Hg and Cd were not correlated with other HMs, indicating that Hg and Cd had different sources.…”

Section: Factors Influencing Hms In the Aquatic Environmentsupporting

confidence: 77%

Characteristics of Heavy Metals in Seawater and Sediments from Daya Bay (South China): Environmental Fates, Source Apportionment and Ecological Risks

Tao

Peng

et al. 2021

Sustainability

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In this study, the spatiotemporal distributions, potential sources, and ecological risks of Hg, Cr, and As in seawater, and Hg, As, Zn, Cd, Pb, and Cu in sediments from Daya Bay were investigated. The five-year average concentrations of Hg, Cr, and As in seawater were 0.020 μg/L, 0.79 μg/L, and 2.08 μg/L, respectively. The five-year average concentrations of Hg, As, Zn, Cd, Pb, and Cu in surface sediments were 0.04 mg/kg, 7.34 mg/kg, 63.81 mg/kg, 0.23 mg/kg, 25.60 mg/kg, and 11.78 mg/kg, respectively. Annual variations in Hg, Cr, and As in seawater exhibited different trends. HMs in sediments, such as As, Zn, Pb, and Cu, exhibited similar annual variations, whereas Hg and Cd exhibited different annual variations. The spatial distribution of metal species in seawater and sediments showed significant variability, and the concentrations decreased gradually from the coast to the open sea. The comprehensive potential ecological hazard index (RI) of HMs in sediments indicated a relatively high risk, especially for Hg and Cd contamination. The geoaccumulation indices (Igeo) of As, Zn, Pb, and Cu suggested that these metals did not pollute Daya Bay, whereas those of Cd and Hg indicated mild and moderate pollution. The environmental fates of HMs were discussed based on Pearson correlation analysis, revealing that concentrations of HMs were greatly affected by parameters, such as pH, salinity, dissolved oxygen (DO), and total organic carbon (TOC). Principal component and factor analyses indicated that Hg, Cr, As, and dissolved inorganic nitrogen (DIN) in water originated from similar sources, including domestic sewage and wastewater from fishing ports, runoffs, and outlets. For sediments, it was proposed that Cu, Zn, As, Pb, and TOC exhibited similar sources, including cage culture and waste discharge from outlets. Meanwhile, Hg and Cd originated from other point sources, such as a harbor. The study suggests that sustainable management and economic development be integrated to control pollutant emissions in Daya Bay.

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Section: Factors Influencing Hms In the Aquatic Environmentsupporting

confidence: 77%

Characteristics of Heavy Metals in Seawater and Sediments from Daya Bay (South China): Environmental Fates, Source Apportionment and Ecological Risks

Tao

Peng

et al. 2021

Sustainability

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“…This finding is consistent with previous sequential extraction results (Burgay et al, 2020;Wang et al, 2020), which can be explained by the presence of Cd carbonate minerals in pyrite ores (Gujre et al, 2021). Cadmium in this fraction can be readily released into the environment via the process of ion exchange and decomposition of the Cd-carbonate phase (Jung et al, 2019), which may pose a great threat and should receive attention. The acid extractable fraction of Pb accounted for approximately 56%; a relatively high acid extractable fraction proportion of Pb was also found in the soil polluted by dust from a lead-acid battery plant by Liu et al (2018).…”

Section: Geochemical Fractionation Of the Heavy Metals In The Pyrite supporting

confidence: 91%

Cadmium and lead distribution in pyrite ores

Cao

Ren

Wang

et al. 2021

Elementa: Science of the Anthropocene

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The pyrite ores are strategic industrial resources which generally serve as raw material for producing sulfuric acid. However, during the mining and industrial processing activities, associated toxic elements of cadmium (Cd) and lead (Pb) could be released into the surroundings, posing a significant threat to local environment and human health. In this study, the Institute for Reference Materials and Measurement (IRMM) sequential extraction scheme was used to investigate the geochemical fractionation of Cd and Pb in pyrite ores from a mining area located in Yunfu, western Guangdong, China. The results showed that most of Cd and Pb (>90%) were predominantly found in the geochemically mobile fractions, indicating that Cd and Pb were readily bioaccessible thus easily assimilated and accumulated by organisms. FESEM-EDS results showed that the studied pyrite ores were mainly composed of O, S, and Fe, while the XRD characterizations suggested that FeS2 and SiO2 were the major minerals. The high-resolution transmission electron microscope and element mapping characterization further confirmed that FeS2 was the main mineral of pyrite ores which contained relatively enriched toxic heavy metals (e.g., Pb and Cd). The findings highlight that an extremely large amount of geochemically mobile heavy metals can be released into the environmental media during the mining and utilization processes of pyrite ores based on IRMM sequential extraction protocol. Therefore, proper countermeasures against environmental risks of utilizing pyrite ores should be taken to mitigate the impacts on local ecosystem and human health.

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“…The initial data on the concentrations of HM fractions and the %F values for each HM fraction and the CAF values are shown in Table 2 and Figure 2. As for %F, the F1 fraction is the main contributor to the total Sr and Mn content in the bottom sediments of Daya Bay; for other HMs, the leading phase is F4, which is usually represented by aluminosilicate minerals [113]. Bottom sediments are characterized by a significant contribution of F1 to the total Mn content.…”

Section: Assessment Of Bottom Sediments Contamination With Chemical Fractions Of Hmsmentioning

confidence: 99%

Integrated Assessment of Affinity to Chemical Fractions and Environmental Pollution with Heavy Metals: A New Approach Based on Sequential Extraction Results

Vodyanitskii

Власов

2021

IJERPH

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To assess the affinity degree of heavy metals (HMs) to geochemical phases, many indices with several limitations are used. Thus, this study aims to develop a new complex index for assessing contamination level and affinity to chemical fractions in various solid environmental media. For this, a new integrated approach using the chemical affinity index (CAF) is proposed. Comparison of CAF with %F on the literature examples on fractionation of HMs from soils, bottom sediments, atmospheric PM10, and various particle size fractions of road dust proved a less significant role of the residual HMs fraction and a greater contribution of the rest of the chemical fractions in the pollution of all studied environments. This fact is due to the normalization relative to the global geochemical reference standard, calculations of contribution of an individual element to the total pollution by all studied HMs, and contribution of the particular chemical fraction to the total HMs content taken into account in CAF. The CAF index also shows a more significant role in pollution and chemical affinity of mobile and potentially mobile forms of HMs. The strong point of CAF is the stability of the obtained HM series according to the degree of chemical affinity and contamination. Future empirical studies are necessary for the more precise assessment of CAF taking into account the spatial distribution of HMs content, geographic conditions, geochemical factors, the intensity of anthropogenic impact, environmental parameters (temperature, humidity, precipitation, pH value, the content of organic matter, electrical conductivity, particle size distribution, etc.). The combined use of CAF along with other indices allows a more detailed assessment of the strength of HMs binding to chemical phases, which is crucial for understanding the HMs’ fate in the environment.

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Fractionation and risk assessment of metals in sediments of an ocean dumping site

Cited by 24 publications

References 55 publications

Characteristics of Heavy Metals in Seawater and Sediments from Daya Bay (South China): Environmental Fates, Source Apportionment and Ecological Risks

Characteristics of Heavy Metals in Seawater and Sediments from Daya Bay (South China): Environmental Fates, Source Apportionment and Ecological Risks

Cadmium and lead distribution in pyrite ores

Integrated Assessment of Affinity to Chemical Fractions and Environmental Pollution with Heavy Metals: A New Approach Based on Sequential Extraction Results

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