Flow-injection spectrophotometric determination of residual free chlorine and chloramine |
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Authors: | Anupama Chaurasia and Krishna K Verma |
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Institution: | (1) Department of Chemistry, Rani Durgavati University, Jabalpur, 482001 Madhya Pradesh, India;(2) Present address: 363 Chhoti Omti, Japalpur, 482002 Madhya Pradesh, India |
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Abstract: | 2,4-Dinitrophenylhydrazine has been suggested as a new reagent for the flow-injection spectrophotometric determination of residual chlorine based on its oxidation to 2,4-dinitrophenyldiazonium ion. The measurement of the decrease in colour intensity under reversed flow-injection (reagent injection) conditions has been used for the determination of 0.1–10 mg/l Cl present as free or combined chlorine, and for its speciation. The limit of detection was 0.05 mg/l Cl. Copper (II), iron (III) and many other ions have been found not to vitiate the results. |
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