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      https://www.ias.ac.in/article/fulltext/jess/130/0048

    • Keywords

       

      Adsorption; desorption; isotherm models; brackish water lagoon.

    • Abstract

       

      The Chilika Lagoon is the largest brackish water ecosystem in the Asian continent and is a Ramsar site. Here, the sorption–desorption study was standardized simulating the environmental condition of the Chilika, to ascertain whether phosphorus (P) is the source or sink for sediments of the coastal ecosystem. The sorption behaviour of sediment phosphorus was better fitting into the modified Langmuir model. The effects of salinity, pH, and temperature on phosphorus sorption were found to be better understood by nonlinear relationships. The sorption was recorded to increase at its lower concentrations with increasing of mentioned parameters, when it decreased beyond some threshold values. The maximum phosphorus sorption capacity (Q$_{max}$) was more (258 mg/kg) in the freshwater stretch of the lagoon; Northern Sector compared to the relatively saline stretches, i.e., Outer Channel (219 mg/kg) and Southern Sector (237 mg/kg) (p < 0.05). This study will help to control eutrophication by increasing P sorption.

      $\bf{Highlights}$

      $\bullet$ Phosphorus sorption and desorption study mark an unique for the Asian largest lagoon Chilika

      $\bullet$ The behaviour of sediment phosphorus sorption was better expressed by the modified Langmuir model than by the alternative modified Freundlich model

      $\bullet$ The maximum phosphorus sorption capacity (Q$_{max}$) was more in the fresh water stretch of the Chilika lagoon compared to the relatively saline stretches

      $\bullet$ For management of eutrophication condition of the lagoon by increasing P sorption through restoration of the freshwater environment.

    • Author Affiliations

       

      SAROJA KUMAR BARIK1 SATYANARAYAN BRAMHA2 SRIKANTA SAMANTA3 AJIT KUMAR PATTANAIK4 RAJ KISHORE PATEL5 TAPAN KUMAR BASTIA1 RABINDRO NATH SAMAL6 DIBAKAR BEHERA1 PRASANTA RATH1

      1. Department of Chemistry, School of Applied Sciences, KIIT University, Bhubaneswar, Odisha 751 024, India.
      2. Health, Safety and Environment Group, Indira Gandhi Centre for Atomic Research, Govt. of India, Kalpakkam, Tamil Nadu 603 102, India.
      3. ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata 700 120, India.
      4. Wetlands International South Asia, A-25, 2nd Floor, Defence Colony, New Delhi 110 024, India.
      5. Department of Chemistry, National Institute of Technology, Rourkela, Odisha 769 008, India.
      6. Wetland Research and Training Centre, Chilika Development Authority, Bhubaneswar, Odisha, India.
    • Dates

       
  • Journal of Earth System Science | News

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