Abstract
This study was aimed to know the environmental factors influencing the decomposition of organic materials and nutrient availability in the water and sediment of Setail River. The sediment sample was collected from five locations (SR1, SR2, SR3, SR4, and SR5). The water sample was analyzed for total organic matter (TOM), ammonia, nitrate, phosphate, dissolved oxygen (DO), chemical oxygen demand (COD), turbidity, total suspended solids (TSS), total dissolved solids (TDS), and pH. The sediment sample was analyzed for organic carbon, total nitrogen, C/N ratio, and total bacterial number. The results showed that the decomposition of organic materials in the water was influenced by several environmental factors, such as DO and COD. The organic carbon, total nitrogen, and total bacterial number in the sediment might also affect the amount of organic materials and nutrients in the water. It was suggested that decomposition of organic materials in the Setail River seemed to be related to the ammonification and nitrification process.
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