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  • Anthropogenic impacts  (1)
  • Rare earth elements  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Environmental geochemistry of the Pichavaram mangrove ecosystem (tropical), southeast coast of India (1999)
    Springer
    Environmental geology 37 (1999), S. 223-233 
    Details
    ISSN: 1432-0495
    Keywords: Key words Mangrove ; Geochemistry ; Biological productivity ; Anthropogenic impacts ; Heavy metal sink
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Spatial and temporal geochemical variations of various parameters in the water and sediment of a relatively small mangrove situated on the southeast coast of India were examined in detail for the first time. The water quality generally reflects the impact of seawater and the Vellar estuary (mixing effect) aided by evaporation and in situ biological productivity. The depletion and fluctuation of dissolved silica are controlled by biological processes. Nitrate and phosphate are contributed by fertilizer input from adjoining agriculture fields. Total suspended matter (TSM) shows an erratic range and trend due to deforestation and resuspension processes. Sand and silt constitute 70–90% of the sediments. Statistical analysis of the sediments shows the prevalence of a moderately high-energy environment with very effective winnowing activity. Organic matter content is higher in the mangrove sediments in comparison to adjacent estuaries. Water and sediment show fluctuations in their chemical concentration, but no specific trends could be identified. Heavy metals are also enriched in the mangrove sediments, indicating their unique chemical behavior and the existence of trapping mechanisms. Factor analysis and correlation analysis of water and sediments show the complexity of the system and the multitude of contributing sources. The core sediment chemistry suggests the depletion of metal input due to the damming of the detrital inputs. The Pichavaram mangrove seems to be relatively unpolluted, since the anthropogenic signal observed is small and acts as a sink for heavy metals contributed from a multitude of sources without an adverse effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050380
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rare earth elements and heavy metal distribution in estuarine sediments of east coast of India (1999)
    Springer
    Hydrobiologia 397 (1999), S. 89-99 
    Details
    ISSN: 1573-5117
    Keywords: Rare earth elements ; estuarine sediments ; east coast of India ; heavy metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bed sediment samples collected from the Hoogly, Godavari, Krishna and Cauvery estuaries on the east coast of India were analyzed for rare earth elements (REEs), mainly lanthanides (La–Lu), Y, a number of metals (V, Cr, Co, Ni, Zn, Ag, Cd and Pb), using Thermal Ionization Mass Spectrometry. Continental weathering plays an important role in the distribution of REEs and metals. However, metals showed wide variation in concentration among estuaries, mainly due to varying salinity, which controls complex estuarine processes, and partly to anthropogenic inputs. Factor analysis of elemental data identified two major groups of elements: (i) LREEs, HREEs, Cd, Pb and Ag, revealing an association with detritals brought in by the rivers; and (ii) V, Cr , Co, Ni and Zn, indicating complex estuarine processes and human input. LREEs are more enriched than HREEs (LREE/HREE ratio varied between 12 and 40) reflecting silicate weathering of crustal materials, and a resultant increase in LREEs in detritals. We conclude that the estuarine system constitutes 70% of LREEs and 30% of HREE flux to the Bay of Bengal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003646631589
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    Paper (German National Licenses)
    Fulltext
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