Public Health Engineering Lab 1
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Public Health Engineering Lab 1 Presentation Transcript

  • 1. Lab No. 1Determine the turbidity ofdifferent samples of waterLokhaze AliVisiting FacultyNICE, SCEE, NUST
  • 2. What is EnvironmentalAnalytical Science?A scientific discipline that develops and applies methods,instruments and strategies to determine the nature andconcentrations of chemical constituents of the environment. Ithelps in determining the concentration of harmful pollutants inthe environmentTWO MAJOR SUBSECTIONS :Qualitative analysis : What is present?• determination of chemical identity of the species in the sampleQuantitative analysis : How much present?• determination of the amount of species or analytesLab # 1 2
  • 3. Protocol used forEnvironmental AnalysisLab # 1 3
  • 4. ParametersPhysical• Temperature• Colour• SolidsChemical• pH• metals• nutrients• InorganicsBiological• Total coliform• Faecal coliformsLab # 1 4
  • 5. Lab # 1 5
  • 6. Advantages of InstrumentalMethods• High Sensitivity• Accuracy• Small sample can be analysed• Measurements obtained are reproducible• Fast Determination• Complex sample can be handled easily• Process can be made automaticLimitations of Instrumental Methods• High Cost• Necessary to use reference substance• Skilled Persons are requiredLab # 1 6
  • 7. Lab # 1 7
  • 8. Lab # 1 8
  • 9. What is turbidity?Turbidity is a measure of water clarity. Turbid watercan look cloudy or opaque and can also affect the colorof the waterMaterial that causes well water to become turbidincludes:• Clay• Silt• Finely dissolved organic and inorganic material• Microorganisms such as bacteria and virusesA turbidity test will measure the decrease in thepassage of light through a water sample based on theamount of floating particles in the water.Lab # 1 9
  • 10. Potential Health EffectsHealth effects from turbid water will dependupon the type of material in the water that iscausing the turbidity.Higher turbidity levels are often associated withdisease-causing microorganisms such as viruses,parasites and some bacteria. These organismscan cause symptoms such as• Nausea• Cramps• Diarrhea• Head achesLab # 1 10
  • 11. Standard for turbidity indrinking water?The Maximum Contaminant Level, as setby the WHO is 5 Nephelometric turbidityunit (NTU).Lab # 1 11
  • 12. Nephelometric TurbidimeterLab # 1 12
  • 13. Thank You