The Winkler Method

  • Thread starter CGallin
  • Start date
  • #1
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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
 

Answers and Replies

  • #2
Borek
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Start finding out what reactions are taking place. Google is your friend.
 
  • #3
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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.
 
  • #4
Borek
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Do the calculations for your blank - do they yield zero? If not, that's by how much off your final result is.
 
  • #5
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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?
 
  • #6
Borek
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Yes. Blank tells you how much titrant is consumed before your sample starts to react.
 
  • #7
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Thanks for the help, i got it all figured out.
 

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