International Journal For Multidisciplinary Research

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Volume 8 Issue 5
September-October 2026

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Impact Of Cadmium Chloride On The Changes In Pigment Content Of A Cyanobacterium Under Laboratory Controlled Conditions.

Author(s) Prof. Dr. Ashok Kumar Panigrahi, Nibedita Padhy
Country India
Abstract The Pulp and paper mill effluent waste contained significant amount of cadmium, mercury and lead much more than prescribed limit by Pollution Control Board is deadly toxic. The effluent of this industry is discharged into River Nagavali without any biological treatment. The present study aims at understanding the impact of cadmium on the growth and pigment content of the blue-green alga under laboratory controlled conditions. Complete bleaching of the algal mass was observed from 3rd day of exposure period onwards and at higher concentration of the toxicant in the exposed set when compared to control algal cells. Gradually tiny blue-green particles started making their appearance in the white turbid mass as observed in the naked eye after 15-20days of recovery period. The maximum allowable concentration (MAC) recorded for this alga for 15 days exposure was 0.33mg l-1. The LC10 value was 0.51 mg l-1, the LC50 value was 0.76 mg l-1, LC90 value was 1.14 mg l-1 and LC100 value was 1.26 mg l-1, for this particular alga, Anabaena cylindrica. The control set showed 100% survival through out the experimental periods. The alga absorbed significant amount of cadmium. The growth of the alga significantly reduced at lethal concentrations. However at maximum allowable concentration, no impact was noticed. The pigments like total chlorophyll, total pheophytin content and carotenoid content significantly depleted at higher concentrations of cadmium chloride except at sub-lethal concentration where either no impact or little stimulation was noticed. No significant recovery was noted in the tested parameters. The study indicated dual impact of cadmium chloride indicating no harm at sub-lethal concentration and inhibition at higher concentration.
Keywords Pulp & Paper mill, effluent, cadmium, cyanobacterium, BGA, pigments.
Field Biology > Agriculture / Botany
Published In Volume 8, Issue 5, September-October 2026
Published On 2026-10-21
DOI https://doi.org/10.36948/ijfmr.2026.v08i05.89720
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CrossRef DOI prefix of IJFMR is 10.36948/ijfmr

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