Influence of ligands on metal speciation, transport and toxicity in a tropical river during wet (monsoon) period

Anindita Gogoi, G. G. Tushara Chaminda, Alicia K J An, Daniel D Snow, Yusong Li, Manish Kumar

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Metal speciation and transport are seldom assessed in densely populated Tropical River. An evaluation of the phase distribution for Copper (Cu), Lead (Pb) and Zinc (Zn) along with chemical speciation, variance with different water quality parameters and toxicity were conducted in the Brahmaputra River of India from upstream to downstream during wet (monsoon) periods in July 2014. Results indicated that metal free ions and carbonates were dominant in the inorganic fractions whereas metal concentrations were negligible in the anionic inorganic fractions. Due to high sediment load in the river during monsoon, metals were substantially higher in the particulate fractions than in the aqueous phase. Partition coefficient for Cu (3.1–6.1), Pb (3.4–6.5) and Zn (3.5–6.9), demonstrated strong adsorption of the metals on suspended matter. Q-mode hierarchical cluster analysis (HCA) illustrated groupings mainly governed by quality parameters rather than by the river course. R-mode results imply selectivity of the affinities of metals for different ligands. Health risk index (HRI) values were less than 1 for dissolved metal for Cu, Pb and Zn while it was greater than 1 for total metal for Pb and Cu indicating potential human health risk. The study demonstrated that binding of metals with naturally occurring dissolved organic matter or suspended particulate matter affects metal bioavailability in river during wet periods when sediment load is particularly high. A combination of empirical, computational and statistical relationships between ionic species and fractions of metals provided greater certitude in identifying the resemblance among the different locations of the river.

Original languageEnglish (US)
Pages (from-to)322-333
Number of pages12
JournalChemosphere
Volume163
DOIs
StatePublished - Nov 1 2016

Fingerprint

Rivers
ligand
Toxicity
monsoon
Metals
Ligands
toxicity
metal
river
Zinc
Health risks
zinc
health risk
Sediments
Chemical speciation
speciation (chemistry)
Particulate Matter
Water Quality
Carbonates
Health

Keywords

  • Brahmaputra river
  • Cluster analyses
  • Health risk index
  • Heavy metals
  • India
  • MINTEQA2
  • Speciation

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Influence of ligands on metal speciation, transport and toxicity in a tropical river during wet (monsoon) period. / Gogoi, Anindita; Tushara Chaminda, G. G.; An, Alicia K J; Snow, Daniel D; Li, Yusong; Kumar, Manish.

In: Chemosphere, Vol. 163, 01.11.2016, p. 322-333.

Research output: Contribution to journalArticle

Gogoi, Anindita ; Tushara Chaminda, G. G. ; An, Alicia K J ; Snow, Daniel D ; Li, Yusong ; Kumar, Manish. / Influence of ligands on metal speciation, transport and toxicity in a tropical river during wet (monsoon) period. In: Chemosphere. 2016 ; Vol. 163. pp. 322-333.
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