Seasonal Variation on Dissolved Oxygen, Biochemical Oxygen Demand and Chemical Oxygen Demand in Terengganu River Basin, Malaysia

  • Journal of Environmental Science and Management
  • Mohd Khairul Amri Kamarudin East Coast Environmental Research Institute (ESERI), Universiti Sultan Zainal Abidin, Gong Badak Campus, 21300 Terengganu, Malaysia
  • Noorjima Abd Wahab
  • Siti Nor Aisyah Md Bati
  • Mohd Ekhwan Toriman
  • Ahmad Shakir Mohd Saudi
  • Roslan Umar
  • Sunardi
Keywords: Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Correlation Test, Terengganu River


The rise in human population densities and the pace of development had intensified the depletion of the water quality. This study aimed to analyze the concentration of dissolved oxygen (DO), biochemical oxygen demand (BOD) and chemical oxygen demand (COD) during wet season and dry season at Terengganu River in 2016. A total of 29 monitoring stations in the study area were selected and three water quality parameters were analyzed using descriptive statistics and the correlation matrix methods. The DO ranged from 2.11 to 8.07 mg L-1, COD from 2.24 to 39 mg L-1 and BOD from 0.67 to 6.52 mg L-1 for the wet season while in dry season, DO ranged from 2.30 to 6.05 mg L-1, COD from 1.9 to 20.48 mg L-1 and BOD from 0.04 to 13.99 mg L-1. Spearman’s correlation test shows there was a weak correlation between DO and COD during wet season, while in the dry season, there was a weak correlation between DO-COD and DO-BOD. This study also found out that urbanization and anthropogenic activities in the area can gave the more impact towards seasons and water quality deterioration in Terengganu River, Malaysia.