Effect of Parathion Exposure towards Green Microalgae Chlorella vulgaris on the Changes of Physicochemical Parameters in Water
Cheng Wan Hee1, Wong Ling Shing1 and Chong Kah Chi1
Faculty of Health and Life Sciences, INTI International University,
Persiaran Perdana BBN, 71800 Nilai, Negeri Sembilan, Malaysia
Corresponding
author: wanhee.cheng@newinti.edu.my
Abstract:Agricultural activities has caused the release
of pesticides such as parathion into the environment, which threatened the
freshwater ecosystem. Therefore, the objective is to observe for the changes of
physicochemical parameters (pH, conductivity and dissolve oxygen) caused on Chlorella vulgaris due to parathion
exposure. The cell count of C. vulgaris
was done using hemocytometer and this alga was exposed to different
concentrations of parathion (1.000 mg/L, 0.100 mg/L, 0.001 mg/L, and 0.000 mg/L
(negative control)). The values of each parameter were recorded before the
exposure and after 1 hour, 2 hours, 6 hours and 24 hours of exposure by using
physicochemical parameter. The results showed a fluctuation of all
physicochemical parameters (pH, conductivity and dissolved oxygen) values in
the surrounding water at the first 5 hours of exposure and decreased before
reaching a plateau after the fifth hour of exposure. The reason of this
phenomenon could be due to the inhibition effects of parathion towards the
photosynthesis activities of the algae and thus lowering the physicochemical
parameters. Therefore, C. vulgaris
serves as a good bioindicator of parathion pollution. Keywords: Chlorella vulgaris, bio-indicator
|