Speciation of metals and their distribution in tropical estuarine mudflat sediments, southwest coast of India

Fernandes, Maria C.; Nayak, G. N.

doi:10.1016/j.ecoenv.2015.07.016

Cited by 33 publications

(13 citation statements)

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“…of metal solubilized from an environmental compartment and ready for uptake by biota. Determining total metal concentration alone in sediments cannot provide information about their mobility, bioavailability, and toxicity (Chakraborty 2012;Arfania and Asadzadeh 2015;Fernandes and Nayak 2015;Ma et al 2016). In addition, the distribution scheme of metals in sediments can vary with time under the variation of physical, chemical, and hydrological conditions (e.g., tides, pH, ionic strength).…”

Section: Responsible Editor: Nives Ogrincmentioning

confidence: 99%

“…Recent data suggest that sediments from this mangrove ecosystem are heavily contaminated in Cd, Zn, Pb, and Cu Kouassi et al 2015). An abundant literature is available for metal speciation in tropical estuaries (Cuong and Obbard 2006;Fernandes and Nayak 2015;Ma et al 2016). However, trace metal fate varies with aquatic environments and little information on metal mobility is available in the Ebrie Lagoon for predicting their potential toxicity.…”

Section: Responsible Editor: Nives Ogrincmentioning

confidence: 99%

“…Without emptying the grab, a sample was taken from the center with a polyethylene spoon (acid washed) to avoid contamination by the metallic parts of the dredge. The samples were sealed in plastic bags, transported to the laboratory at 4°C, oven-dried at 60°C, homogenized, and stored at 4°C until analysis (Chakraborty 2012;Canuto et al 2013;Qiao et al 2013;Chakraborty et al 2014;Fernandes and Nayak 2015). Each sample was sieved through a stainless steel mesh to remove any particle larger than 63 μm in size.…”

Section: Study Area and Samplingsmentioning

confidence: 99%

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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: Responsible Editor: Nives Ogrincmentioning

confidence: 99%

Section: Responsible Editor: Nives Ogrincmentioning

confidence: 99%

Section: Study Area and Samplingsmentioning

confidence: 99%

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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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“…Considerably high concentrations of Cr were found in the residual fraction which was fairly stable and at a less bioavailable phase [ 44 , 47 ] and therefore indicated the influence of natural bedrock. The relatively high concentrations of Zn and Cr in Fe/Mn oxide fraction around the Qiongzhou Strait indicated that the diagenetic mobilization of metals and current through the Qiongzhou Strait may affect the distribution [ 44 , 48 ].…”

Section: Resultsmentioning

confidence: 99%

Geochemical Assessment and Spatial Analysis of Heavy Metals in the Surface Sediments in the Eastern Beibu Gulf: A Reflection on the Industrial Development of the South China Coast

Chen

Lin

Qian

et al. 2018

IJERPH

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The Beibu Gulf (also named the Gulf of Tonkin), located in the northwest of the South China Sea, is representative of a bay suffering from turbulence and contamination associated with rapid industrialization and urbanization. In this study, we aim to provide the novel baseline levels of heavy metals for the research area. Concentrations of five heavy metals (i.e., Cu, Pb, Zn, Cd and Cr) were determined in surface sediments from 35 sites in the eastern Beibu Gulf. The heavy metal content varied from 6.72 to 25.95 mg/kg for Cu, 16.99 to 57.98 mg/kg for Pb, 73.15 to 112.25 mg/kg for Zn, 0.03 to 0.12 mg/kg for Cd, and 20.69 to 56.47 mg/kg for Cr, respectively. With respect to the Chinese sediment quality criteria, sediments in the eastern Beibu Gulf have not been significantly affected by coastal metal pollutions. The results deduced from the geoaccumulation index (Igeo) showed that the study area has been slightly polluted by Pb, which might be caused by non-point sources. Relatively high concentrations of Cu, Pb and Cd were found around the coastal areas of Guangxi province, the Leizhou Peninsula and the northwest coast of Hainan Island, whereas the highest concentrations of Zn and Cr were found on the northwest coast of Hainan Island. Spatial distribution patterns of the heavy metals showed that bioavailable fractions of Pb were higher than in the residual fractions, while Cu and Cd concentrations in exchangeable and carbonate fractions were relatively higher than those in the bioavailable fractions. Hierarchical clustering analysis suggested that the sampling stations could be separated into three groups with different geographical distributions. Accompanying their similar spatial distribution in the study area, significant correlation coefficients among Cu, Cd and Pb were also found, indicating that these three metals might have had similar sources. Overall, the results indicated that the distribution of these heavy metals in the surface sediments collected from the Beibu Gulf was complex.

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“…The studied chemical compounds have been found in marine and oceanic ecosystems for about forty years ago. Over the last years, a new phase of such studies has begun, that is due to the interest in studying bioavailability of microelements [8–11].…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton and Its Role in Accumulation of Microelements in Bottom Deposits of Azov Sea

Dotsenko

Mikhailenko

2019

The Scientific World Journal

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The importance of phytoplankton is high in transformation of substances in aquatic ecosystems and in formation of suspension’s material structure. Its main functions are consumption of the dissolved biogenic components and chemical elements and their conversion to a firm phase. The article is devoted to the bioaccumulation of microelements by phytoplankton in the ecosystem of the Azov Sea. The fact that the algal biomass during the periods of blooming in the sea reaches 1,400 g/l makes this study especially urgent. The authors define the rates of biogeochemical cycle and the intensity of chemical elements’ consumption and also investigate the role of phytoplankton in the formation chemical peculiarities of bottom deposits and its involvement in sedimentogenesis in the Azov Sea. The cause of the reduced trace element content in bottom deposits relatively to suspended material is established. It is noted that the amount of some elements annually consumed by algae of the Azov Sea is up to 75% from their maximum delivery by terrigenous material.

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Speciation of metals and their distribution in tropical estuarine mudflat sediments, southwest coast of India

Cited by 33 publications

References 37 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

Geochemical Assessment and Spatial Analysis of Heavy Metals in the Surface Sediments in the Eastern Beibu Gulf: A Reflection on the Industrial Development of the South China Coast

Phytoplankton and Its Role in Accumulation of Microelements in Bottom Deposits of Azov Sea

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