Environmental magnetic and geochemical characteristics of Chennai coastal sediments, Bay of Bengal, India

Journal of Earth system science

S Veerasingam2¹  K Deenadayalan3²  T Ramkumar4³  N Basavaiah3²  R Venkatachalapathy1⁴ 

[1] Department of Physics, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India.$$;Environmental Magnetism Laboratory, Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India.$$;Department of Earth Sciences, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India.$$;Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai 608 502, Tamil Nadu, India.$$

关键词: Environmental magnetism;    heavy metals;    pollution load index;    marine sediments;    multivariate statistical analysis.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

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, 𝜒ARM 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, 𝜒ARM 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.

【 授权许可】

Unknown