4 March 2013

Chemical Oxygen Demand (COD) Calculator

Chemical Oxygen Demand (COD) Calculator Online. The Chemical Oxygen Demand or COD, is a measurement of the amount of material that can be oxidized (combined with oxygen) in the presence of a strong chemical oxidizing agent. More specifically, the test is a process of decomposing pollutants in water after two hours of boiling the water in a solution of potassium dichromate. COD Calculator calculates Chemical Oxygen Demand in a Water.

Formula:-

Chemical Oxygen Demand (COD) = (A-B)xMx8000 / Volume of Sample mL


Where:
  • A : mL of titrant used for sample
  • B : mL of titrant used for blank
  • M : Normality of ferrous ammonium sulfate

Calculation of Chemical Oxygen Demand (COD):-


Titrant used for sample: mL
Titrant used for blank: mL
Normality of Ferrous Ammonium Sulfate:
Chemical Oxygen Demand (COD) : mg O2/L

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5 comments:

  1. Can you be more specifc on
    what is blank ?
    and why do we need Normality of ferrous ammonium sulphate

    ReplyDelete
    Replies
    1. blank is a synthetic samples containing potassium hydrogen phthalate and NaCl was tested by laboratories.

      Delete
  2. How many volume of sample is used in the calculation. Please specify this volume of sample.

    ReplyDelete
  3. Where is the 8000 coming from?

    ReplyDelete
    Replies
    1. 8000 = milliequivalent weight of oxygen X 1000 mL/L.

      Delete