Abstract
The Langat River is one of the main sources of water supply for the Selangor area. For water-quality analysis, water sampling was carried out at five stations during the wet (November 2009) and dry (February 2010) seasons. These five stations are located along the river, with the exception of station 3. Station 1 and station 2 are located upstream station 3, while station 4 and station 5 lie downstream of station 3. Station 3 differs from the other four stations because it is a discharge from Universiti Kebangsaan Malaysia campus. This study was conducted to determine water quality as well as levels of pollution, based on the Water Quality Index (WQI) and the Malaysian Interim National Water Quality Standard (INWQS), of the Langat River at Km 7. A total of 14 water-quality parameters—temperature, pH, dissolved oxygen (DO), conductivity, chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), total dissolved solids (TDS), PO4, NO3-, NH3-N, SO4, oil and grease, and E. co...
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