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The Winkler Method

  1. Nov 7, 2012 #1
    So I'm having a hard time finding exactly what calculations are involved in the Winkler method

    What I have is three different titrations a;
    1) Standardization of the Thiosulfate Solution which was done with deionized water
    2) Blank Determination
    3) Thiosulfate Titration of the Sample that I am attempting to find the dissolved oxygen content in.

    The problem I am having is relating these three together. If someone could explain it to me or point me to a website that could explain this to me I would be very grateful.

    Thanks
     
  2. jcsd
  3. Nov 7, 2012 #2

    Borek

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    Staff: Mentor

    Start finding out what reactions are taking place. Google is your friend.
     
  4. Nov 8, 2012 #3
    Okay, so I've found the dissolved oxygen concentration (I believe) but the thing that is confusing me is why I have a Blank determination. I feel as tho I should of used this somewhere along the way but it never factored into my calculations.
     
  5. Nov 8, 2012 #4

    Borek

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    Staff: Mentor

    Do the calculations for your blank - do they yield zero? If not, that's by how much off your final result is.
     
  6. Nov 8, 2012 #5
    So for the blank I have it that I used 0.3 mL of thiosulfate so I would subtract 0.3 mL from the amount of thiosulfate used in the calculations to determine the dissolved oxygen concentration?
     
  7. Nov 8, 2012 #6

    Borek

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    Staff: Mentor

    Yes. Blank tells you how much titrant is consumed before your sample starts to react.
     
  8. Nov 8, 2012 #7
    Thanks for the help, i got it all figured out.
     
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