International Journal of Applied Science and Technology

ISSN 2221-0997 (Print), 2221-1004 (Online) 10.30845/ijast

Sediment Oxygen Demand of the Santubong River and Their Contributing Factors
Ling Teck Yee, Hazel N.M.F. Pusin, Lee Nyanti, Michelle C. Miod

Abstract
Sediment oxygen demand (SOD) is the oxygen required for the biological and chemical processes occurring in the sediment. The concentration of dissolved oxygen in the Santubong River was reported to be low. However, sediment oxygen demand of the river has not been reported in literature. Therefore, the objective of this study was to measure the oxygen demand of the sediment in the Santubong River. Cores of sediment were collected from fiveĀ  sampling stations in three different trips during low tide. Oxygen depletion was measured every 10 minutes for 180 minutes in the laboratory. Results showed that SOD at 20 oC ranged from 4.5 to 9.8 g O2/m2-day. It was found that SOD values were significantly higher near aquaculture sites. Furthermore, total organic carbon and total phosphorus of the sediment explained 96% of the total variation in SOD20. The high oxygen demand of sediment potentially leads to low dissolved oxygen in the water column at the cage culture and aquaculture effluent discharge areas which is potentially detrimental to aquatic life.

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