determination of carbon dioxide in water

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determination of carbon dioxide in water

  1. 1. DETERMINATION OF CARBON DIOXIDE IN WATER SAIMA ALEEM M.PHIL ENVIRONMENTAL CHEMISTRY
  2. 2. Introduction Surface waters  Surface waters normally contain less than 10 ppm free carbon dioxide. Ground water Ground waters may easily exceed that concentration.
  3. 3. Classical method Buret titration method. Improved evolution method. Instrumental method Coulometry method.
  4. 4. Fill the burette with standarized sodium hydroxide. Take a 100 ml of sample in a conical flask . Add 10 drops of Phenolpthalein indicator. CO2 + NaOH NaHCO3 + Na+ + H2O
  5. 5. precaution Sample must be fresh. performed immediately after collection of water sample.
  6. 6. REAGENTS 1.5 N sulfuric acid (for acidifying the sample). 0.03N barium hydroxide (for absorbing carbon dioxide). Standard 0.04N hydrochloric acid( for titrating the barium hydroxide). Phenolphthalein indicator.
  7. 7. Blank determinations  Transfer 200 ml boiled dislled water in flask “A”.  Introduce 40 ml. of barium hydroxide solution into the absorption tube, C.  Add 0.2 ml. of phenolphthalein indicator.  Acidify the sample by the addition of 25 ml. of 1.5 N sulfuric acid from buret “I”.  Apply heat to it by means of the 300-watt hot plate.  After 15 minute of recirculation barium hydroxide is titrated with standrized hydrochloric acid.
  8. 8. Sample determination  Transfer 200 ml water sample in a flask “A”.  Introduce 40 ml. of barium hydroxide solution into the absorption tube, C.  Add 0.2 ml. of phenolphthalein indicator.  Acidify the sample by the addition of 25 ml of 1.5 N sulfuric acid from buret “I”.  Apply heat to it by means of the 300- watt hot plate.  After 15 minute of recirculation barium hydroxide is titrated with standrized hydrochloric acid.
  9. 9. DETERMINATION OF CARBON DIOXIDE IN WATER BY COULOMETRY Collection of sample  Sample are drawn into 12 individually borosilicate glass bottles.
  10. 10. Procedure  First the back ground level and calibration factor have been determined.  Dispense the sample (30 cm3) into the stripping chamber.  Acidify it with phosphoric acid (1.5 cm3).  Record the final coulometer reading.  when the coulometer titration rate returns to the background level ,system is ready to analyze next sample.
  11. 11. “ THANK YOU”

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