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    Distribution and fractionation of rare earth elements and Yttrium in suspended and bottom sediments of the Kali estuary, western India

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    Environ_Earth_Sci_76_174_2017a.pdf (1.067Mb)
    Date
    2017
    Author
    Suja, S.
    Fernandes, L.L.
    Rao, V.P.
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    Abstract
    Concentrations of rare earth elements (REE) and yttrium (Y), and major metals (Al, Fe and Mn) were measured in suspended particulate matter (SPM) and bottom sediments of the Kali estuary, western India, for their distribution and fractionation. The contents of SPM and metals in it were more uniform along the longitudinal transect during the monsoon. During the post- and pre-monsoons, low SPM in the upper/middle estuary coincided with high Fe and Mn and total REE (ƩREE). But in the lower estuary SPM and its ƩREE content increased seaward, while Fe and Mn decreased. The Y/Ho ratios decreased seaward during the monsoon but increased during the post-monsoon. Sm/Nd ratios were more uniform along the transect during monsoon but decreased marginally seaward in other seasons. The Post-Archean Average Australian Shale (PAAS)-normalized REE patterns exhibited middle REE and heavy REE enrichment with positive Ce ( Ce/Ce*Ce/Ce* ), Eu ( Eu/Eu*Eu/Eu* ) and Y anomalies. The Ce/Ce*Ce/Ce* increased but Eu/Eu*Eu/Eu* decreased marginally seaward. The fine-grained sediments showed higher ƩREE and lower Y/Ho ratios than in coarse-grained sediments. The PAAS-normalized REE patterns of sediment were similar to that of SPM. The results revealed two processes, colloidal flocculation and coagulation of metals in the low-salinity zone and an estuarine turbidity maximum in the high salinity zone. Rare earths and yttrium (REY) in SPM and sediments primarily reflected the source rock composition than that of chemical weathering. Apart from physico-chemical processes, the mineralogy and grain size of sediments controlled the distribution and fractionation of REY in the estuary
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    http://drs.nio.org/drs/handle/2264/5107
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