Concentration levels of nitrate and phosphate in river and ground water samples from 9 different states of westem Malaysia were determined. lt was found that most of the rivers are slightly polluted with nitrate and phosphate. The highest concentration of nitrate (26.0 mg] L) was found in Melaka state in the river of Batang, while the lowest concentration of nitrate (2.61 mg! L) was found in the Terengganu state in the river of Besut The highest concentration of phosphate (0.66 mg/L) was found in Penang state in the river of Kulim. The minimum concentration of phosphate (0.02 mg/L) was found in different states. The most important sources that contribute to the pollution were raw crops, irrigated agriculture and over-application of animal wastes.
M IMRAN ,I KHAN ,N ULLAH ,
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