Environmental Analysis of Heavy Metal Deposition in a Flow-Restricted Tropical Estuary and Its Adjacent Shelf

Balachandran, K.K.; Laluraj, C. M.; Martin, G. D.; Srinivas, K.; Venugopal, P. Dilip

doi:10.1080/15275920600996339

Cited by 56 publications

(35 citation statements)

References 21 publications

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“…The first factor accounts for 29.5 % of the total variance and contains Pb, Cu and Zn, as well as electric conductivity and water pH with high variable loadings on this factor and corresponds to group I of the cluster analysis. This indicates flocculation or co-precipitation which is influenced by salinity and pH (Balachandran et al, 2006). Aprile and Bouvy (2008) have recently shown that limnological processes are natural factors controlling such spatial variations of the heavy metals in sediments.…”

Section: Heavy Metals Pollutionmentioning

confidence: 99%

Assessment of heavy metal pollution in the urban stream sediments and its tributaries

Sekabira

Origa

Basamba

et al. 2010

Int. J. Environ. Sci. Technol.

309

138

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Section: Heavy Metals Pollutionmentioning

confidence: 99%

Assessment of heavy metal pollution in the urban stream sediments and its tributaries

Sekabira

Origa

Basamba

et al. 2010

Int. J. Environ. Sci. Technol.

309

138

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“…Even though station 5 was situated in an adjacent channel, we have considered it to be approximately 1 km north of station 4, as the tide at this point was found to lag behind station 4 [19]. The dominant fresh water flow on 28 th October was indicated by the near zero salinity towards the seaward end of the study area, which however showed saline incursion (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) at bottom during high tide (Figure 2). During pre monsoon (March 2004), increased tidal activity brought in a vertical mixing, as the salinity increased (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) in the study region and water was warmer by 4°C (28° to 32.2°C) as compared to the previous season (Figure 3).…”

Section: Climatic Conditions and Hydrographymentioning

confidence: 99%

“…The monsoon-derived alluvium accumulates in the estuary during postmonsoon, whereas silting environment prevails during the pre-monsoon [15,16]. The natural and anthropogenic factors influencing the geochemistry of sediments in the Cochin backwaters and the adjacent coast have been reported [2,17]. Many studies have assessed the environmental changes caused by anthropogenic input of nutrients and other materials in this estuarine system, albeit, systematic study over a region covering tidal cycles are not yet reported.…”

Section: Introductionmentioning

confidence: 99%

Fresh Water Influence on Nutrient Stoichiometry in a Tropical Estuary, Southwest Coast of India

Martin¹,

Vijay²,

Laluraj³

et al. 2007

Appl Ecol Env Res

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Abstract. Cochin backwaters, a micro tidal estuary, undergo a characteristic transformation from a riverdominated system during summer monsoon to a tide-dominant system during pre-monsoon season. The present study observes that as the river flow weakens after monsoon, the flushing of the estuary diminishes and the nitrogen and phosphorous loadings through anthropogenic activities (industries) and sediment re-suspension alter the nutrient stoichiometry substantially. The increased tidal activity during pre-monsoon changes the estuary into a vertically mixed, eutrophic and flow-restricted system supporting an enhanced organic production. This implies that monsoon-induced hydrology plays an important role in regulating the nutrients, secondary production and even the migrant fauna of the estuary. The system is delicately poised, as continuous release of pollutants including nutrients into this estuary would suppress fish and shell fish production, where only pollution tolerant species can exist.

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“…The high organic enrichment in sediment in the Cochin and Neendakara harbour region in the present observation could be a sign of environmental deterioration. The nutrient delivery from industries, aggravated by the complex circulation and weak flushing had led to an increased production and settling of organic matter in the estuarine transect especially at Cochin transect [52,53].…”

Section: Discussionmentioning

confidence: 99%

Heavy Metal Contamination and Risk Assessment in the Marine Environment of Arabian Sea, along the Southwest Coast of India

S¹,

Muduli²,

Vardhan³

et al. 2012

CHEMISTRY

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Marine ecosystem is being threatened by the discharge of untreated sewage wastes and industrial effluents which ultimately affects the sustainability of living resources and public health. These wastes carry enormous level of toxicants especially the heavy metals have the tendency to accumulate into the basic food chain and move up through the higher trophic level and results in negative impact on the marine resources thus causing economic loss. In this regard, to ascertain the level of heavy metals in water, particulate, zooplankton (Zn, Mn, Pb, Cu, Cd and Hg) and in sediment (Pb, Al, Cd and Hg) along southern Kerala coast, India has been evaluated during early 2006. The heavy metal concentrations followed the hierarchy; Zn>Mn>Pb>Cu>Cd>Hg; Pb>Zn>Mn>Cu>Cd>Hg; Zn>Pb>Mn>Cu>Cd>Hg and Pb>Al>Cd>Hg in seawater, particulate matter, zooplankton and sediment respectively. The results revealed that in all the transacts (except Cochin) the heavy metal concentrations are below the threshold levels associated with the toxicological effects and the regulatory limits. Metal enrichments were observed close to the major urban areas of coastal waters, mostly associated with large scale industrialization. Enrichment factor, geoaccumulation index and pollution load index were calculated to evaluate the heavy metal threats along the coastal sediment. It revealed minor to moderately severe enrichment of Cd, Pb and Hg in the industrial zones of the coastal stretches especially at Cochin. A comparison with sediment quality guideline quotient indicated that there may be probability of ecotoxicological threats to the benthic community along Cochin transect.

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Environmental Analysis of Heavy Metal Deposition in a Flow-Restricted Tropical Estuary and Its Adjacent Shelf

Cited by 56 publications

References 21 publications

Assessment of heavy metal pollution in the urban stream sediments and its tributaries

Assessment of heavy metal pollution in the urban stream sediments and its tributaries

Fresh Water Influence on Nutrient Stoichiometry in a Tropical Estuary, Southwest Coast of India

Heavy Metal Contamination and Risk Assessment in the Marine Environment of Arabian Sea, along the Southwest Coast of India

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