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Chemistry of DPD

DPD stands for N, N-diethyl-p-phenylene-diamine.

In this method the DPD indicator  reacts instantaneously with free available chlorine residual in the absence of iodide. Subsequent addition to the same sample of a small amount of iodide ion (I-) acts catalytically to cause mono chloramine to produce color quantitatively. Further addition of iodide ion to excess, in the form of KI, results in a rapid response from dichloramine. Unlike the reaction with neutral orthotolidine, any nitrogen trichloride present shows up in the dichlorainine fraction rather than in the free available chlorine fraction. However, by adding Iodide ion before the DPD indicator solution, a proportion of the nitrogen trichloride is caused to appear in the free available chlorine fraction.


7 Responses to “Chemistry of DPD”

  1. Enervis says:

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  3. Maxwell Janeway says:

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  4. Rick Koeing says:

    There is just so many things we don’t understand about chemistry. It is a big great world. Your article is nothing more than a small part of it. Small but significant

  5. salih says:

    please tell me the reaction of DPD with chlorine
    chemical structure and formula

  6. Tison says:

    good job!

  7. Seguin says:

    It genuinely answered my problem, thank you!

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