Acta Scientific Agriculture (ASAG)(ISSN: 2581-365X)

Research Article Volume 8 Issue 6

Assessment of heavy metal contamination in the surface sediments of Neyyar River- Kerala, South India

Prasanna Kumari AA1*, Ganga Devi T2 and Jayaraman PR2

1Department of Garden Management Division, KSCSTE- Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Palode, Thiruvananthapuram, Kerala, India
2H.H. The Maharaja’s University College, Thiruvananthapuram, Kerala, India

*Corresponding Author: Prasanna Kumari AA, Department of Garden Management Division, KSCSTE- Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Palode, Thiruvananthapuram, Kerala, India.

Received: April 16, 2024; Published: May 23, 2024

Abstract

Neyyar River (Latitude 80 16’ to 80 40’ N and Longitude 770 5’ to 770 16’ E) with 56 Km length originating from the Agasthyamala, flows through the midland, low land and joins with the Lakshadweep Sea at Poovar Pozhi. Neyyar is the primary source of drinking water supply to entire Neyyattinkara taluk of Thiruvananthapuram district, Kerala. Study focused on the analyses of heavy metals in the surface sediments of Neyyar River and samples were collected from 10 previously identified station locations of the River for a period of one year and subjected for different heavy metal analysis. The study sites were categorized into fresh water zone (stations 1-8) and estuarine (9-10) zone depending on saline influence. Dried and powdered sediment samples are extracted using acid digestion method with concentrated nitric acid and perchloric acid (4:1 ratio). Analyses of various heavy metals such as copper, zinc, cadmium, chromium and lead were done using Atomic Absorption Spectrophotometer. Decrease in concentrations was observed in the estuarine zone for all five metals analyzed. Among them cadmium and lead showed comparatively higher concentration than internationally accepted standard values indicating the contaminative nature of the river sediments with respect to cadmium and lead. However, copper, zinc and chromium reported remained within the accepted standard values for particular metals. Spatial and temporal variations remained significant for all metals except copper where only monthwise variations were significant. Sediment contamination was assessed by enrichment factor and geo-accumulation index, and observed that sediments in Neyyar River are moderately contaminated.

Keywords: Contamination; Anthropogenic; Autochthonous; Spatial; Temporal

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Citation

Citation: Prasanna Kumari AA., et al. “Assessment of heavy metal contamination in the surface sediments of Neyyar River- Kerala, South India". Acta Scientific Agriculture 8.6 (2024): 22-32.

Copyright

Copyright: © 2024 Prasanna Kumari AA., et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.




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