Sujatha, C H; Deepulal, P M; Gireesh Kumar, T R(Indian Academy of Sciences, October , 2012)
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Abstract:
The distribution and accumulation of the rare earth elements (REE) in the sediments of the Cochin
Estuary and adjacent continental shelf were investigated. The rare earth elements like La, Ce, Pr, Nd,
Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and the heavy metals like Mg, V, Cr, Mn, Fe, Cu, Zn, U, Th
were analysed by using standard analytical methods. The Post-Archean Australian Shale composition
was used to normalise the rare earth elements. It was found that the sediments were more enriched with
the lighter rare earth elements than the heavier ones. The positive correlation between the concentrations
of REE, Fe and Mn could explain the precipitation of oxyhydroxides in the study area. The factor
analysis and correlation analysis suggest common sources of origin for the REEs. From the Ce-anomalies
calculated, it was found that an oxic environment predominates in all stations except the station No. 2.
The Eu-anomaly gave an idea that the origin of REEs may be from the feldspar. The parameters like
total organic carbon, U/Th ratio, authigenic U, Cu/Zn, V/Cr ratios revealed the oxic environment and
thus the depositional behaviour of REEs in the region
Description:
J. Earth Syst. Sci. 121, No. 5, October 2012, pp. 1215–1227
Sujatha, C H; Manju, Nair P; Akhil, P S(Indian Academy of Sciences, December , 2013)
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Abstract:
Geochemical composition is a set of data for predicting the climatic condition existing in an ecosystem.
Both the surficial and core sediment geochemistry are helpful in monitoring, assessing and evaluating the
marine environment. The aim of the research work is to assess the relationship between the biogeochemical
constituents in the Cochin Estuarine System (CES), their modifications after a long period of anoxia
and also to identify the various processes which control the sediment composition in this region, through
a multivariate statistical approach. Therefore the study of present core sediment geochemistry has a
critical role in unraveling the benchmark of their characterization. Sediment cores from four prominent
zones of CES were examined for various biogeochemical aspects. The results have served as rejuvenating
records for the prediction of core sediment status prevailing in the CES
Description:
J. Earth Syst. Sci. 122, No. 6, December 2013, pp. 1557–1570
Sujatha, C H; Manju, Nair P(Academic Journals, September , 2013)
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Abstract:
This study gave the first report on the biennial metal divergence in the sediments of Cochin
Estuarine system (CES). Surface sediments from 6 prominent regions of CES were sampled
in 2009 and 2011 for the geochemical and environmental assessment of trace metals (Cd,
Co, Cr, Cu, Pb Fe, Mg, Mn, Ni and Zn).Besides texture, total organic carbon (TOC) and
CHNS were also done. The contamination and risk assessment were performed by
determining geochemical indices. Comparison with sediment quality guidelines were done
to assess the probability for ecotoxicological threat to the estuary. Results showed that the
measured heavy metals had varied spatial distribution patterns, indicating that they had
complex origins and controlling factors
Description:
International Journal of Recent Scientific Research
Vol. 4, Issue, 9, pp.1365- 1369, September, 2013
This paper presents the first detailed investigation on the residual levels of organochlorine insecticide
(OCI) concentrations in the Cochin estuarine sediment. It aims in elucidate their distribution and ecological
impact on the aquatic system. Concentrations of persistent organochlorine compound (OC) were
determined for 17 surface sediment samples which were collected from specific sites of Cochin Estuarine
System (CES) over a period of November 2009 and November 2011. The contaminant levels in the CES
were compared with other worldwide ecosystems. The sites bearing high concentration of organochlorine
compounds are well associated with the complexities and low energy environment. Evaluation of
ecotoxicological factors suggests that adverse biological effects are expected in certain areas of CES
Sujatha, C H; Manju, Nair P(International Science Congress Association, April 14, 2013)
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Abstract:
Distribution of toxic metal in the sediment core is an important area of research for environmental impact studies. Sediment
cores were collected from two prominent region(C1 and C2) of CE and subjected to geochemical analysis to determine
distribution of toxic metals (Cd, Co, Cr, Cu and Pb ), texture characteristics, total organic carbon (TOC) and CHNS.
Statistical analysis was done to understand the interrelationship between the components. In the studied cores, metal
contamination level was identified for Pb, Cu; Cr, in C1 and C2 respectively. The metal distribution depends on the
granulometric factor, geogenic mineral components and anthropogenic input. Correlation analysis (CA) and Principal
component(PCA) analysis also support these results
Description:
Research Journal of Chemical Sciences,Vol. 3(4), 65-69, April (2013)