Browsing by Author "R. Nagarajan"

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    Enrichment pattern of leachable trace metals in roadside soils of Miri City, Eastern Malaysia
    (Springer, 2014) R. Nagarajan; M. P. Jonathan; Priyadarsi D. Roy; M. V. Prasanna; A. Elayaraja
    This article presents the results on distribution and enrichment pattern of acid-leachable trace metals (ALTMs) from roadside soil of Miri city, Sarawak, East Malaysia. The city is one of the fastest developing in the Malaysian region with huge petroleum resources. ALTMs Fe, Mn, Cr, Cu, Ni, Co, Pb, Zn and Cd along with organic carbon and carbonates (CaCO3) were analyzed in 37 soil sediments collected from roadside.
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    Environmental significance and geochemical speciation of trace elements in Lower Baram River sediments
    (Elsevier, 2019) K. Prabakaran; R. Nagarajan; S. Eswaramoorthi; A. Anandkumar; F. Merlin Franco
    The geochemistry and distribution of major, trace and rare earth elements (REE's) was studied in the surface sediments of the Lower Baram River during two seasons: the Monsoon (MON) and Post-monsoon (POM). The major geochemical processes controlling the distribution and mobility of major, trace and REE's in the Lower Baram River surface sediments was revealed through factor analysis. The risk assessment of major and trace element levels was studied at three specific levels; i.e. the enrichment level [Contamination Factor (Cf), with the geo-accumulation index (Igeo)], the availability level [metals bound to different fractions, risk assessment code (RAC)], and the biological toxicity level [effect range low (ERL) and effect range medium (ERM)].
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    Geochemical behaviour and risk assessment of trace elements in a tropical river, Northwest Borneo
    (Elsevier, 2020) K. Prabakaran; S. Eswaramoorthi; R. Nagarajan; A. Anandkumar; F. Merlin Franco
    This study focuses on the highly mobile fraction of trace elements in particulates (<11 μm) and dissolved form in the Lower Baram River. A factor model utilizing trace elements in the dissolved and mobile phase in the particulates (<11 μm) along with water column characteristics and the partition coefficient (Kd) of the trace elements indicated a more significant role for manganese oxyhydroxides in trace element transport.
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    Human health risk assessment and bioaccumulation of trace metals in fish species collected from the Miri coast, Sarawak, Borneo
    (Elsevier, 2018) A. Anandkumar; R. Nagarajan; K. Prabakaran; Chua Han Bing; R. Rajaram
    The concentrations of nine trace metals (Cr, Mn, Co, Ni, Cu, Zn, Rb, Cd, and Pb) were measured in different tissues of two pelagic and five demersal fish species collected from the Miri coast, Sarawak.
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    Metal concentrations in sediments from tourist beaches of Miri City, Sarawak, Malaysia (Borneo Island)
    (Elsevier, 2013) R. Nagarajan; M.P. Jonathan; Priyadarsi D. Roy; L. Wai-Hwa; M.V. Prasanna; S.K. Sarkar; M. Navarrete-López
    Forty-three sediment samples were collected from the beaches of Miri City, Sarawak, Malaysia to identify the enrichment of partially leached trace metals (PLTMs) from six different tourist beaches. The samples were analyzed for PLTMs Fe, Mn, Cr, Co, Cu, Ni, Pb, Sr and Zn.
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    Seasonal variation and mobility of trace metals in the beach sediments of NW Borneo
    (Elsevier, 2022) A. Anandkumar; R. Nagarajan; Eswaramoorthi Sellappa Gounder; K. Prabakaran
    Miri city has a dynamic coastal environment, mainly influenced by intensive sedimentation from the Baram River and excessive trace metal loading by the Miri River, which are significant environmental concerns. As the mobility, bioavailability, and toxicity of the trace metals in the sediments are largely controlled by their particulate speciation, the modified BCR sequential extraction protocol was applied to determine the particulate speciation of trace metals in the coastal sediments of Miri, to unravel the seasonal geochemical processes responsible for known observations, and to identify possible sources of these trace metals.