Spatial and seasonal trends of trace metals in the surficial sediments from off Kochi- Geochemistry and environmental implications

Fifty four sediment samples representing pre and post-monsoon seasons were collected along a transect from off Kochi, lying between the latitudes 9.57'59.5''-9. 54' 30.4'' and longitudes 76. 11' 7.04''-75. 38' 50.3'' of the South eastern Arabian Sea. The present study investigates the levels of trace metals (Zn, Cd, Pb, Cu, Fe, Ni, Mn, Co and Cr), total organic carbon (TOC), total inorganic carbon (TIC), elemental composition and grain size to assess the extent of environmental pollution and to discuss the distribution of these trace metals in the surficial sediments. Sediment pollution assessment was done using the Contamination factor (C.F), Geoaccumulation Index (Igeo), Enrichment Factor (EF), and Pollution Load Index (PLI). The majority of trace metals analysed in this study exhibited the highest concentrations at stations 1, 2 and 3 where the land-based anthropogenic input was found to be maximum.

Automated summary

This study investigated sediment samples from off Kochi in the South eastern Arabian Sea to assess environmental pollution levels and distribution of trace metals. The results showed that the highest concentrations of trace metals were found at stations close to land, indicating that land-based anthropogenic input is the major source of pollution.