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Lesson Plan 15 Time: 1 hour Title: Water Testing and Analysis Learning Expectations: 1. Describe physical, biological and chemical contaminant tests and indicators for water quality 2. Identify common test procedures and equipment for bacteriological tests 3. Explain the appropriateness of water testing Materials Required: Turbidity tube Water testing technologies Topics and Key Points 1. Learning Strategies Water Tests and Indicators Bacteriological: e.coli, fecal coliforms Chemical: fluoride, arsenic, heavy metals Physical: pH Other: salinity, turbidity, colour 2. Water test options 1. Physical test: Turbidity tube (low cost option), Colour , Smell 2. Chemical tests: Colorimeter (reagent and colorimeter) Test kits (test cubes, reagents) 3. Bacteria tests: (most useful) membrane filtration (filter apparatus, incubator, miro-filter paper, media broth, etc.) - pump water sample through micro-filter paper, place filter paper in Petri dish with broth, incubate for 24 hours at 35C and then count individual bacteria colonies most probable number (already prepared dish with reagents included) presence/ absence (indicator strip, UV lamp) - place indicator strip in water sample, observe for colour change petrifiltm PPT (Day 4-7 – Short) 1-19 Facilitator led with demonstrations Time (min) 5 25 3. Field Lab Considerations: size, weight, batter operated, airport security, locally available, 5 4. Applications Testing may be to expensive and may not really be needed May be useful to convince users of need or of benefits 5 5. Review Reflection: