Practical Manual for GCE A/L Biosystem Technology Teachers

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Lesson 18: Treating a water sample using alum and sunlight
(Research Services Centre, Faculty of Science, University of Kelaniya, 2015) Skandaraja, S.S.
Lesson 17: Determination of water quality parameters such as pH, dissolved oxygen (DO) and electrical conductivity by chemical methods
(Research Services Centre, Faculty of Science, University of Kelaniya, 2015) Skandaraja, S.S.
Lesson 16: Determination of water quality parameters such as temperature, colour, turbidity and total solids by physical methods
(Research Services Centre, Faculty of Science, University of Kelaniya, 2015) Skandaraja, S.S.