DefinePK

Abstract

The main objective of the present study was to evaluate the variations of inorganic and organic nitrogen (N)-based nutrients based on seasonal changes in the Setiu River Basin, situated at the southern part of the South China Sea (Malaysia). In addition, fractionation of the dissolved organic N (DON) was also determined. Results showed an increase of these nutrients was observed from the upstream to the downstream stations due to the impact of anthropogenic activities. It was found that during the wet season, runoff from the land increased the nutrient concentrations in the water column. High molecular weight DON is the main fraction of DON, constituting more than 60% of the total DON.