Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India

Chakraborty, Parthasarathi; Babu, P.V. Raghunadh

doi:10.1016/j.marpolbul.2015.02.035

Cited by 52 publications

(8 citation statements)

References 44 publications

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“…The sorption of metals on sediment phases is a complex physical-chemical process. Changes in environmental conditions, such as pH, salinity, redox potential, organic matter, and temperature could influence metal distribution in sediment fractions (Chakraborty and Babu 2015;Wang et al 2015). For example, under reducing conditions, iron/manganese oxides can dissolute and be released into the water column.…”

Section: Ph Salinity Dissolved Oxygen and Sediment Grain Sizesmentioning

confidence: 99%

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

et al. 2018

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Purpose Trace metals accumulate in the food web and can pose high risks to human health and aquatic biota. We investigated seasonal and spatial variations of Cu, Zn, Pb, Co, and Ni mobility in surface sediments (0-5 cm) and their potential toxicity. Materials and methods The sampling was carried out in three embayments of the Ebrie Lagoon (Côte d'Ivoire) during the rainy and dry seasons. The sequential and kinetic extraction methods were used to assess Cu, Zn, Pb, Co, and Ni mobility and their potential toxicity. Analysis of variance (ANOVA) was performed to ascertain spatial and seasonal differences. Results and discussion The results showed that contrarily to Co, distribution patterns of Zn and Cu in the sediment fractions showed no spatial and seasonal variability. On the other hand, Pb and Ni distribution patterns varied highly across the bays but not seasonally. Nevertheless, repeated measurements over a long period of time should be carried out to better understand the seasonal variability of metal distribution in sediment phases. Cu, Pb, Co, and Ni were abundant in residual fraction (56.93-71.66%) in the bays. On the contrary, a very high portion of Zn (up to 70%) could be remobilized. Cu, Pb, Co, and Ni formed mainly inert complexes in sediments, while Zn formed labile complexes. Zn could pose high risk to biota, Co and Ni a medium risk, and Cu and Pb a low risk. Conclusions A combination of both sequential and kinetic methods revealed that both Zn and Pb formed labile complexes in the exchangeable and iron/manganese oxide fractions. Sequential extraction showed high Pb concentrations in the iron/manganese oxides. Thus, Zn and Pb may be highly available, which confirmed fish Pb concentrations exceeding WHO safe limits found by previous studies. Therefore, potential mobility of metals could be better assessed by the exchangeable and iron/manganese oxide fractions obtained by sequential extraction methods.

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Section: Ph Salinity Dissolved Oxygen and Sediment Grain Sizesmentioning

confidence: 99%

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

et al. 2018

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“…Other factors, such as physical and chemical properties of soil may also influence the distribution pattern of Hg deposition around the power plants. It has been indicated that Hg and organic matter have strong complexation which could influence the accumulation of Hg in soils [11]. In addition, strong correlation between soil Hg contents and TOC has been reported in other studies [12].…”

Section: Figure III Decreasing Trend Curve Of Hg Contents With Gradimentioning

confidence: 85%

Spatial Trends of Mercury in the Surface Soils around the Shi li-quan Power Plant of Zaozhuang City, China

Dan¹,

Ren²,

Yang³

2019

Proceedings of the 2019 2nd International Conference on Sustainable Energy, Environment and Information Engineering (SEEIE 2019

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Mercury (Hg) deposition in soils derived from coal combustion in coal-fired power plants can be large and quickly. In this study, Shi li-quan power plant, a large ultra-high voltage thermal power plant which is located in Zaozhuang City was selected to study the effect of the coal-fired power plant on the Hg deposition in surrounding soils. Results showed that the average soil Hg contents near the power plant is ~0.1 mg/kg which is about 5-fold than the background level of Shandong province (0.019 mg/kg). Soil Hg contents decreased with increasing distance from power plant and the decreasing speed being relatively slow in the northeast of the power plant due to convenient transportation and dense population.

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“…The untreated effluents and solid wastes from many commercial and small-scale industries such fertilisers, sugar, paint, tobacco, jute, plastic, refinery, textiles, paper, and ship-wreaking set up along the coastline and riverbank areas contributed to metal pollution [64][65][66]. Heavy metals such as Ni, Pb, Zn, Cu, and Cr, derived from both natural and anthropogenic sources, are thought to be related to sedimentary phases such as organic matter and carbonate [67][68][69]. The heavy metal concentration in this study was compared with other coastal regions in India and other countries.…”

Section: Discussionmentioning

confidence: 99%

Heavy metal pollutants and their spatial distribution in surface sediments from Thondi coast, Palk Bay, South India

Perumal

Antony

Subagunasekar

2021

Preprint

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Background The concentration of heavy metals and their spatial distribution in surface sediments collected from the Thondi coast, Palk Bay, South India were analysed in this study. The sediment grain size, pH, EC, and heavy metal concentrations (Mn, Fe, Cr, Zn, Cd, Ni, Cu, and Pb) were determined and the values for the geoaccumulation index (Igeo), enrichment factor (EF), potential contamination index (Cp), potential ecological risk index (PERI), contamination factor (CF), modified contamination degree (mCd), degree of contamination (Cd), and potential contamination factors (Cp) were calculated based on their background values to determine the pollution level of the study area. The sediment grain size, pH, EC, and heavy metal concentrations were determined and the values for the pollution indices were calculated based on their background values to determine the pollution level. Results The pollution indices, namely EF, CF, Cd, mCd, CP, \({\text{E}}_{\text{r}}^{\text{i}}\), and PERI, except for Igeo, revealed that the heavy metal contamination was due to Cd, while a moderate level of contamination was caused by Cu, Zn, Pb, and Cr. The principal component analysis and correlation matrix analysis showed a strong positive loading for Cd due to its high level of contamination in the study area. Anthropogenic inputs such as municipal wastewater, domestic sewage discharge, fishing harbour activities, and industrial and aquaculture wastes led to the increased Cd concentration in the study area. Moreover, the pollution load index revealed that the sediments were polluted by heavy metals. Conclusion The findings of this study revealed that the increased concentration of heavy metals in the study area increases the toxicity in the marine environment, thus affecting the ecosystem.

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Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India

Cited by 52 publications

References 44 publications

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire

Spatial Trends of Mercury in the Surface Soils around the Shi li-quan Power Plant of Zaozhuang City, China

Heavy metal pollutants and their spatial distribution in surface sediments from Thondi coast, Palk Bay, South India

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