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- W2554522453 abstract "s well as industrial waste materials that lead the secondary production (fisheries) by triggering the phytoplankton growth (primary producers). The waste materials from the highly urbanized and industrialized city of Kolkata, however, contain heavy metals such as Zinc, Copper, Manganese, Iron, Cobalt, Nickel, Lead, Chromium etc. that oscillate as a function of monsoonal run -off, environmental parameters etc. Among the environmental variables, pH has the major influence on the speciation of heavy metals. In this paper, an attempt has been made to assess the influence of aquatic pH on two major heavy metals namely Zn and Cu in the wetland ecosystem. A temporal analysi s with more than three decades of pH data, dissolved as well as biologically available Cu and Zn in surface sediment/pond soil has been critically analysed. It is observed from the temporal trend of pH that the values have decreased over a period of more t han three decades. It is also observed that dissolved Zn and Cu gradually increased over a per iod of time whereas biologically available Zn and Cu in the sediment have decreased simultaneously. This phenomenon confirms the regulatory role of pH in the process of speciation as a result of which precipitated metallic species of the underlying sedimen ts undergo dissolution resulting in high values of dissolved heavy metals under a low pH situation. The present study is of immense importance as the process of acidification (gradual lowering of aquatic pH) accelerates the dissolved heavy metals in the aq uatic phase due to which the floating food chain species such as plankton, carp variety of fishes might be affected through the process of bioaccumulation . Stabilizing the aquatic pH through application of measured doses of lime may be a roadmap to restor e the situation." @default.
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- W2554522453 date "2016-11-18" @default.
- W2554522453 modified "2023-09-23" @default.
- W2554522453 title "Impact of acidification on heavy metal levels in a bheri of East Kolkata Wetlands (EKW), a Ramsar Site in the Indian sub-continent" @default.
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- W2554522453 doi "https://doi.org/10.22192/ijarbs.2016.03.11.018" @default.
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