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A new chlorophycean nickel hyperaccumulator.

Harish1, S Sundaramoorthy, Devendra Kumar

  • 1Department of Botany, JNV University, Jodhpur 342 001, India.

Bioresource Technology
|September 11, 2007
PubMed
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This study shows that the green alga Chlorococcum hemicolum can bioremediate nickel (Ni2+), with a tolerance limit of 12 mg L(-1). Nickel absorption by the alga increased linearly with concentration, exceeding adsorption.

Area of Science:

  • Environmental Microbiology
  • Bioremediation
  • Phycology

Background:

  • Nickel (Ni2+) pollution poses environmental risks.
  • Microalgae show potential for heavy metal bioremediation.
  • Chlorococcum hemicolum is a candidate species for nickel removal.

Purpose of the Study:

  • To investigate the bioremediation capacity of Chlorococcum hemicolum for nickel.
  • To determine the nickel tolerance limit and absorption/adsorption kinetics of the alga.
  • To assess the impact of nickel stress on the alga's biochemical parameters.

Main Methods:

  • Culturing Chlorococcum hemicolum at various nickel (Ni2+) concentrations.
  • Assessing growth rates via protein levels.
  • Quantifying nickel absorption and adsorption after 240 hours.

Related Experiment Videos

  • Measuring biochemical parameters: total sugar, chlorophyll, and carotenoids.

    • Main Results:

    • The tolerance limit for Ni2+ was determined to be 12 mg L(-1) (46.76% growth kinetics).
    • Nickel absorption by the alga was higher than adsorption, with a maximum accumulation factor (AF) of 1.37.
    • A linear relationship was observed between Ni2+ concentration and absorption (r=0.98; p>0.01).
    • Nickel stress led to reductions in total sugar, chlorophyll, and carotenoids.

    Conclusions:

    • Chlorococcum hemicolum effectively absorbs nickel, indicating its potential as a bioremediator.
    • Nickel accumulation is concentration-dependent and primarily occurs via absorption.
    • Nickel exposure negatively impacts algal metabolism, affecting key biochemical components.