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Presentation on EC & pH

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M
Md. Aminur Rahman

This document provides information about measuring electric conductivity: - Conductivity is a measure of how well an aqueous solution can carry an electric current, depending on the concentration and mobility of ions. It is measured in units like μS/cm and is used to indicate water purity. - To measure conductivity, a sample is placed in a beaker and the conductivity tester is immersed and stirred until a reading appears. The tester measures in a range of 10-1990 μS/cm at 0-50°C. - Proper maintenance of the conductivity tester includes rinsing it with distilled water and isopropyl alcohol to maintain accuracy.

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Presentation On Electric Conductivity (EC) Prepared by Md. Aminur Rahman Senior Chemist . DPHE Zonal Lab., Khulna. Pocket Pal TM Conductivity Tester
Presentation On Electric Conductivity (EC) Conductivity is a measure of the ability of an aqueous solution to carry an electric current. This ability depends on - •The total concentration of ions (cations & anions ) • Their mobility, Valance and •Temperature Unit : -µS/cm, -s/m, - mho (ohm-1 ) Bangladesh standard value: Nil
Why does we measure it ? • It is one the indicator of water purity. • We can get idea about TDS, Salinity from it. • One can guess whether the sample water contains sewage ,Industrial drainage and sea water. • We can guess the degree of mineralization.
Measuring procedure of Conductivity Tester • Take about 25/30 ml sample in a beaker. • On the EC meter by pressing ON/OFF button & remove the protective Cap • Immerse the bottom of the tester into the sample. • Using the tester gently stir the sample & wait some times for reading. Note: Its measuring range 10-1990 µS/cm at 0-50˚C temperature. Verify its accuracy by measuring known calibration standard.
Maintenance • Use distilled water to wash the bottom of the tester . • Wipe it with tissue paper after using & Replace the cap. • Always off the switch after using. • Maintain or Improve performance by periodically rinsing the stainless steel electrode in Isopropyl alcohol.
Typical range of conductivities of various types of natural waters Type of water EC (µS/cm) Rain water 10-100 Stream and river water 30-2000 Shallow ground water 100-5000 Deep ground water 300-5000 Saline ground water and brines 5000-300000
Conclusion To get accurate EC result, measure immediately after sample collection. Thank you for your all kind attention.
Presentation on pH Present By Md. Aminur Rahman Senior Chemist DPHE, Zonal Lab. Khulna.
9 pH What is pH ? • pH is the Negative logarithm of the concentration of hydrogen ion in a solution. • pH= -log [H+ ]. • If pH value < 7, sample is Acidic. pH value = 7, sample is neutral. pH value >7,sample is alkaline. • pH depends on temperature. Pocket pH meter
10 Measuring pH By HACH Sension156 Operating flow diagram • Connect pH probe to the back of the meter • Press EXIT button to “on” the meter. • Press pH button to select pH mode. • Press pH button to display “ pH & Temp.” mode. • Put the probe into the sample. • Press READ / Enter button pH probe
11 Operating flow diagram • “Beep” - sound to stabilize the reading • Appear pH reading. Multimeter
Thank you for your all kind attention.

More Related Content

Presentation on EC & pH

  • 1. Presentation On Electric Conductivity (EC) Prepared by Md. Aminur Rahman Senior Chemist . DPHE Zonal Lab., Khulna. Pocket Pal TM Conductivity Tester
  • 2. Presentation On Electric Conductivity (EC) Conductivity is a measure of the ability of an aqueous solution to carry an electric current. This ability depends on - •The total concentration of ions (cations & anions ) • Their mobility, Valance and •Temperature Unit : -µS/cm, -s/m, - mho (ohm-1 ) Bangladesh standard value: Nil
  • 3. Why does we measure it ? • It is one the indicator of water purity. • We can get idea about TDS, Salinity from it. • One can guess whether the sample water contains sewage ,Industrial drainage and sea water. • We can guess the degree of mineralization.
  • 4. Measuring procedure of Conductivity Tester • Take about 25/30 ml sample in a beaker. • On the EC meter by pressing ON/OFF button & remove the protective Cap • Immerse the bottom of the tester into the sample. • Using the tester gently stir the sample & wait some times for reading. Note: Its measuring range 10-1990 µS/cm at 0-50˚C temperature. Verify its accuracy by measuring known calibration standard.
  • 5. Maintenance • Use distilled water to wash the bottom of the tester . • Wipe it with tissue paper after using & Replace the cap. • Always off the switch after using. • Maintain or Improve performance by periodically rinsing the stainless steel electrode in Isopropyl alcohol.
  • 6. Typical range of conductivities of various types of natural waters Type of water EC (µS/cm) Rain water 10-100 Stream and river water 30-2000 Shallow ground water 100-5000 Deep ground water 300-5000 Saline ground water and brines 5000-300000
  • 7. Conclusion To get accurate EC result, measure immediately after sample collection. Thank you for your all kind attention.
  • 8. Presentation on pH Present By Md. Aminur Rahman Senior Chemist DPHE, Zonal Lab. Khulna.
  • 9. 9 pH What is pH ? • pH is the Negative logarithm of the concentration of hydrogen ion in a solution. • pH= -log [H+ ]. • If pH value < 7, sample is Acidic. pH value = 7, sample is neutral. pH value >7,sample is alkaline. • pH depends on temperature. Pocket pH meter
  • 10. 10 Measuring pH By HACH Sension156 Operating flow diagram • Connect pH probe to the back of the meter • Press EXIT button to “on” the meter. • Press pH button to select pH mode. • Press pH button to display “ pH & Temp.” mode. • Put the probe into the sample. • Press READ / Enter button pH probe
  • 11. 11 Operating flow diagram • “Beep” - sound to stabilize the reading • Appear pH reading. Multimeter
  • 12. Thank you for your all kind attention.