Seasonal assessment of trace element contamination in intertidal sediments of the meso-macrotidal Hooghly (Ganges) River Estuary with a note on mercury speciation

Priyanka Mondal, Rosivaldo de Alcântara Mendes, M. P. Jonathan, Jayanta Kumar Biswas, Kadarkarai Murugan, Santosh Kumar Sarkar

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The spatial and seasonal distribution of trace elements (TEs) (n = 16) in surficial sediment were examined along the Hooghly River Estuary (~ 175 km), India. A synchronous elevation of majority of TEs concentration (mg kg− 1) was encountered during monsoon with the following descending order: Al (67070); Fe (31300); Cd (5.73); Cr (71.17); Cu (29.09); Mn (658.74); Ni (35.89). An overall low and homogeneous concentration of total Hg (THg = 17.85 ± 4.98 ng g− 1) was recorded in which methyl mercury (MeHg) shared minor fraction (8–31%) of the THg. Sediment pollution indices, viz. geo-accumulation index (Igeo) and enrichment factor (EF) for Cd (Igeo = 1.92–3.67; EF = 13.83–31.17) and Ba (Igeo = 0.79–5.03; EF = 5.79–108.94) suggested high contamination from anthropogenic sources. From factor analysis it was inferred that TEs primarily originated from lithogenic sources. This study would provide the latest benchmark of TE pollution along with the first record of MeHg in this fluvial system which recommends reliable monitoring to safeguard geochemical health of this stressed environment.

Original languageEnglish
Pages (from-to)117-130
Number of pages14
JournalMarine Pollution Bulletin
Volume127
DOIs
StatePublished - Feb 2018

Keywords

  • Hooghly River Estuary
  • Methyl mercury
  • Sediment pollution
  • Trace elements

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