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