Geochemical fractionation and risk assessment of trace elements in sediments from tide-dominated Hooghly (Ganges) River Estuary, India

Priyanka Mondal, Marco Schintu, Barbara Marras, Alexandre Bettoschi, Alessandro Marrucci, Santosh Kumar Sarkar, Ranju Chowdhury, Muthuswamy Ponniah Jonathan, Jayanta Kumar Biswas

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The geochemical fractionation and potential mobilization of cadmium, chromium, copper, nickel and lead were studied in surficial sediments (top 0–10 cm; <63 μm grain-size) of the Hooghly (Ganges) River Estuary, eastern part of India, using a sequential extraction procedure. The risk assessment was evaluated at three specific levels; i.e., enrichment level (enrichment factor, geo-accumulation index), the availability level (elements bound to different fractions, risk assessment code, Individual and Global contamination factors) and biological toxicity level (Potential ecological risk index; sediment quality guidelines). Different geochemical phases indicated heterogeneities in TE distribution patterns as follows: (i) Cd was dominant in the exchangeable phase and significant proportion of Pb was bounded to the reducible fractions; (ii) the potential mobile fraction (ΣF1 − F3) in the sediments was higher for Cd and Pb (>46%), reflecting their adverse impact on benthic organisms as they are weakly bound to the sediment and can migrate to water; (iii) a minor fraction of Cu (<10%) was found in the oxidizable fraction suggesting less environmental risk to the aquatic biota and (iv) the dominance of the Ni, Cr and Cu in the residual fraction supports the assumption of their geogenic origin. Both Cd and Cu posed medium to high ecological risk values based on risk assessment code (RAC). Global Contamination Factor (GCF) values allowed to identify the “pollution hotspots” in the study area.

Original languageEnglish
Article number119373
JournalChemical Geology
Volume532
DOIs
StatePublished - 20 Jan 2020

Fingerprint

surficial sediment
Tides
Trace Elements
Estuaries
Fractionation
environmental risk
Risk assessment
mobilization
chromium
biota
hot spot
nickel
Sediments
tide
risk assessment
cadmium
fractionation
Rivers
Surficial sediments
estuary

Keywords

  • Bioavailability
  • Environmental risk
  • Geochemical fractionation
  • Hooghly River Estuary
  • Mobility
  • Trace elements

Cite this

Mondal, Priyanka ; Schintu, Marco ; Marras, Barbara ; Bettoschi, Alexandre ; Marrucci, Alessandro ; Sarkar, Santosh Kumar ; Chowdhury, Ranju ; Jonathan, Muthuswamy Ponniah ; Biswas, Jayanta Kumar. / Geochemical fractionation and risk assessment of trace elements in sediments from tide-dominated Hooghly (Ganges) River Estuary, India. In: Chemical Geology. 2020 ; Vol. 532.
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Geochemical fractionation and risk assessment of trace elements in sediments from tide-dominated Hooghly (Ganges) River Estuary, India. / Mondal, Priyanka; Schintu, Marco; Marras, Barbara; Bettoschi, Alexandre; Marrucci, Alessandro; Sarkar, Santosh Kumar; Chowdhury, Ranju; Jonathan, Muthuswamy Ponniah; Biswas, Jayanta Kumar.

In: Chemical Geology, Vol. 532, 119373, 20.01.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Geochemical fractionation and risk assessment of trace elements in sediments from tide-dominated Hooghly (Ganges) River Estuary, India

AU - Mondal, Priyanka

AU - Schintu, Marco

AU - Marras, Barbara

AU - Bettoschi, Alexandre

AU - Marrucci, Alessandro

AU - Sarkar, Santosh Kumar

AU - Chowdhury, Ranju

AU - Jonathan, Muthuswamy Ponniah

AU - Biswas, Jayanta Kumar

PY - 2020/1/20

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N2 - The geochemical fractionation and potential mobilization of cadmium, chromium, copper, nickel and lead were studied in surficial sediments (top 0–10 cm; <63 μm grain-size) of the Hooghly (Ganges) River Estuary, eastern part of India, using a sequential extraction procedure. The risk assessment was evaluated at three specific levels; i.e., enrichment level (enrichment factor, geo-accumulation index), the availability level (elements bound to different fractions, risk assessment code, Individual and Global contamination factors) and biological toxicity level (Potential ecological risk index; sediment quality guidelines). Different geochemical phases indicated heterogeneities in TE distribution patterns as follows: (i) Cd was dominant in the exchangeable phase and significant proportion of Pb was bounded to the reducible fractions; (ii) the potential mobile fraction (ΣF1 − F3) in the sediments was higher for Cd and Pb (>46%), reflecting their adverse impact on benthic organisms as they are weakly bound to the sediment and can migrate to water; (iii) a minor fraction of Cu (<10%) was found in the oxidizable fraction suggesting less environmental risk to the aquatic biota and (iv) the dominance of the Ni, Cr and Cu in the residual fraction supports the assumption of their geogenic origin. Both Cd and Cu posed medium to high ecological risk values based on risk assessment code (RAC). Global Contamination Factor (GCF) values allowed to identify the “pollution hotspots” in the study area.

AB - The geochemical fractionation and potential mobilization of cadmium, chromium, copper, nickel and lead were studied in surficial sediments (top 0–10 cm; <63 μm grain-size) of the Hooghly (Ganges) River Estuary, eastern part of India, using a sequential extraction procedure. The risk assessment was evaluated at three specific levels; i.e., enrichment level (enrichment factor, geo-accumulation index), the availability level (elements bound to different fractions, risk assessment code, Individual and Global contamination factors) and biological toxicity level (Potential ecological risk index; sediment quality guidelines). Different geochemical phases indicated heterogeneities in TE distribution patterns as follows: (i) Cd was dominant in the exchangeable phase and significant proportion of Pb was bounded to the reducible fractions; (ii) the potential mobile fraction (ΣF1 − F3) in the sediments was higher for Cd and Pb (>46%), reflecting their adverse impact on benthic organisms as they are weakly bound to the sediment and can migrate to water; (iii) a minor fraction of Cu (<10%) was found in the oxidizable fraction suggesting less environmental risk to the aquatic biota and (iv) the dominance of the Ni, Cr and Cu in the residual fraction supports the assumption of their geogenic origin. Both Cd and Cu posed medium to high ecological risk values based on risk assessment code (RAC). Global Contamination Factor (GCF) values allowed to identify the “pollution hotspots” in the study area.

KW - Bioavailability

KW - Environmental risk

KW - Geochemical fractionation

KW - Hooghly River Estuary

KW - Mobility

KW - Trace elements

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DO - 10.1016/j.chemgeo.2019.119373

M3 - Artículo

AN - SCOPUS:85074917966

VL - 532

JO - Chemical Geology

JF - Chemical Geology

SN - 0009-2541

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ER -