Chemical speciation and bio-availability of selected trace metals in the mudflat core sediments of the tropical estuaries, India

Nasnodkar, Maheshwar R.; Nayak, G. N.

doi:10.1007/s12665-017-7081-z

Cited by 16 publications

(2 citation statements)

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“…The rivers/estuaries in Goa over the last two decades are exclusively contaminated with metals as a result of extensive mineral ore mining, industrialization and population expansion (Gadkar et al 2019). Metal as a pollutant in rivers/estuaries is often introduced through natural rocks weathering and anthropogenic actions such as mining, industries, agricultural waste and house-hold sewage (Nasnodkar and Nayak 2017). Upon reaching the estuarine environment, metals precipitate on to suspended sediments under changing environment.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of metals in the environmentally dormant fraction (residual) which is relatively stable is recognized as the input derived from natural sources (Sundaray et al 2011). Therefore, are considered non-bioavailable and have no effects on the environment (Chakraborty et al 2015;Nasnodkar and Nayak 2017). A metal form that is capable of affecting the environment is one present as the bioavailable fraction, which includes exchangeable, carbonate, Fe-Mn oxides and organic matter/sul des.…”

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confidence: 99%

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Speciation of Metals and Their Bioaccumulation by Edible Bivalves (Cassosstrea Spp. And Polymesoda Spp.) in the Aquatic Bodies of Goa, West Coast of India

Bhutia

Nasnodkar

Nayak

2021

Preprint

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Grain size, total organic carbon, total metals and their speciation was investigated in sediments from lower Chapora Estuary, middle Zuari Estuary and Moira River in Goa, India. Study aims to understand metal bioavailability and bioaccumulation in two edible bivalves (Cassosstrea spp. and Polymesoda spp.) in three water bodies of different lengths, catchment areas, hydrodynamics and anthropogenic stress. Hydrodynamics regulated coarser sediment transport and deposition at Chapora and Moira stations, while clay particles deposition at the Zuari Estuary. Considerable difference in total metal level (Mn and/or Zn) from November to December was attributed to their additional input and variation in physicochemical processes. Contamination factor revealed moderate contamination of Zn at Chapora (November), while Zn, Cu and Co were moderately contaminated at Zuari. Presence of metals in considerable or significant amount in bioavailable fractions indicated their bioavailability. Variation in metal accumulation in gills, adductor muscle and digestive gland at three stations and between months was the result of varying hydrodynamics, trophic levels, feeding habits and pollution gradients of metal causes. Interlinkage of metals in water, sediments and bivalves revealed discrepancies in accumulation of metal type. This might be attributed to differential response of species to varying physical and biological factors at study sites. Bivalves showed a selective preference for Zn at three stations highlighting its importance in biological activities. Moreover, metals in bivalves at one or more stations exceeded the standard permissible limit and thus, indicated their toxicity to bivalves and non-suitability for human consumption according to marine pollution index.

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confidence: 99%

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confidence: 99%