Environmental magnetic and geochemical characteristics of Chennai coastal sediments,Bay of Bengal,India |
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Authors: | R VENKATACHALAPATHY S VEERASINGAM N BASAVAIAH T RAMKUMAR K DEENADAYALAN |
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Institution: | (1) Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;(2) Department of Geophysics, China University of Geosciences, Wuhan, 430074, China;(3) Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
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Abstract: | In this study, environmental magnetic, heavy metal and statistical analyses were conducted on 21 surface sediments collected
from Chennai coast, India, to examine the feasibility of heavy metal pollution using magnetic susceptibility. The Chennai
coastal sediment samples are dominated by ferrimagnetic minerals corresponding to magnetite-like minerals. The percentage
of frequency dependent magnetic susceptibility reflects the presence of super-paramagnetic/single domain magnetic minerals
in Chennai harbour, Cooum and Adayar rivers sediments. High pollution load index in sample E1, E2, CH7, C11, C12 and A16 is
mainly due to anthropogenic activities such as, harbour activities, Cooum and Adayar rivers input and industrial effluent.
Factor analysis shows that the magnetic concentration dependent parameters (χ, χ
ARM and SIRM) covary with the heavy metal concentrations, suggesting that the input of magnetic minerals and heavy metals in
Chennai coastal sediments are derived from the same anthropogenic sources. Strong correlation obtained between pollution load
index (PLI) and concentration dependent parameters (χ, χ
ARM and SIRM) for the polluted samples with magnetic susceptibility excess of 50×10 − 8 m3kg − 1. Significant correlations between heavy metals and magnetic susceptibility point out the potential of magnetic screening/monitoring
for simple and rapid proxy indicator of heavy metal pollution in marine sediments. |
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